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ISSN: 2056-9890

Polymorphism in the structure of N-(5-methyl­thia­zol-2-yl)-4-oxo-4H-chromene-3-carboxamide

aFP-ENAS-Faculdade de Ciências de Saúde, Escola Superior de Saúde da UFP, Universidade Fernando Pessoa, Rua Carlos da Maia, 296, P-4200-150 Porto, Portugal, bDepartment of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen, AB24 3UE, Scotland, and cCIQ/Departamento de Quιmica e Bioquιmica, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
*Correspondence e-mail: jnlow111@gmail.com

Edited by W. T. A. Harrison, University of Aberdeen, Scotland (Received 24 June 2017; accepted 3 July 2017; online 13 July 2017)

Chromone derivatives have been extensively studied recently because of to their promising biological activities. The new title chromone–thia­zole hybrid presented here, C14H10N2O3S, is a candidate as a selective ligand for adenosine receptors. The compound has been synthesized and characterized by the usual spectroscopic means (NMR and EM/IE) and its structure elucidated by X-ray crystallography, which revealed the presence of packing polymorphism. The two polymorphs (one with space group P21/n and one with P21/c) show slightly different conformations and the major change induced by crystallization regards the intra­molecular contacts defining the supra­molecular structure. Those differences been highlighted by Hirshfeld surface analysis mapped over dnorm and ESP.

1. Chemical context

Chromones are 4H-benzo­pyran-4-one heterocycles and they have been studied thoroughly because of their inter­esting biological activities (Gaspar et al., 2012a[Gaspar, A., Reis, J., Kachler, S., Paoletta, S., Uriarte, E., Klotz, K. N., Moro, S. & Borges, F. (2012a). Biochem. Pharmacol. 84, 21-29.],b[Gaspar, A., Reis, J., Matos, M. J., Uriarte, E. & Borges, F. (2012b). Eur. J. Med. Chem. 54, 914-918.]; 2014[Gaspar, A., Matos, M. J., Garrido, M., Uriarte, E. & Borges, F. (2014). Chem. Rev. 114, 4960-4992.]) Thia­zole-based compounds have been used in therapeutics as anti­microbial, anti­viral and anti­fungal agents for a long time (Souza, 2005[Souza, M. V. N. de (2005). J. Sulfur Chem. 26, 429-449.]; Siddiqui et al., 2009[Siddiqui, N., Arshad, M. F., Ahsan, W. S. & Alam, M. S. (2009). Int. J. Pharm. Sci. Drug Res. 1, 136-143.]) but, in the past decades, they have been identified as potent and selective ligands for the adenosine receptor (Sharma et al. 2009[Sharma, R. N., Xavier, F. P., Vasu, K. K., Chaturvedi, S. C. & Pancholi, S. S. (2009). J. Enzyme Inhib. Med. Chem. 24, 890-897.]; Jung et al., 2004[Jung, K., Kim, S., Gao, Z., Gross, A. S., Melman, N., Jacobson, K. A. & Kim, Y. (2004). Bioorg. Med. Chem. 12, 613-623.]). In a continuation of our project related to the synthesis of pharmacologically useful heterocycles, the title compound has been designed as a potential ligand for human adenosine receptors.

[Scheme 1]

This work reports the synthesis and structural characterization of this chromone–thia­zole hybrid, N-(5-methyl­thia­zol-2-yl)-4-oxo-4H-chromene-3-carboxamide, 1, that was synthesized following a method previously described by Cagide et al. (2015[Cagide, F., Borges, F., Gomes, L. R. & Low, J. N. (2015). J. Mol. Struct. 1089, 206-215.]). The chromone ring (A) is connected to the thia­zole ring (C) though a carboxamide spacer (B). The compound crystallizes with two different morphologies and the structural analysis revealed the presence of packing polymorphism. Since this compound will be assayed in tests to evaluate its biological activity, the establishment of the polymorphic structures is of the utmost importance.

2. Structural commentary

The mol­ecular structures of the polymorphs are shown in Fig. 1[link]. This compound presents packing polymorphism and crystallizes in monoclinic space groups P21/n and P21/c, the latter with two mol­ecules in the asymmetric unit (identified as mol#1 and mol#2). In 1_P21/c, mol#1 fits into mol#2 with values of quaternion fit weighted of 0.093 Å (unit-weight r.m.s. fit of 0.086 Å for 20 atoms).

[Figure 1]
Figure 1
A view of the asymmetric unit of 1_P21/n with the atom-numbering scheme (top). A view of the asymmetric unit of 1_P21/c with mol#1 (left) and mol#2 (right) with the atom-numbering scheme (bottom). Displacement ellipsoids are drawn at the 70% probability level.

The conformation around the amide rotamer for chromone carboxamides can be either -anti or -syn. The former appears to be more probable since it lowers the steric hindrance between the two aromatic rings as compared to the -syn rotamer. Structural characterizations made previously in other 4H-chromene-3-carboxamides (Gomes et al., 2015a[Gomes, L. R., Low, J. N., Cagide, F., Gaspar, A. & Borges, F. (2015a). Acta Cryst. E71, 1270-1277.],b[Gomes, L. R., Low, J. N., Cagide, F. & Borges, F. (2015b). Acta Cryst. E71, 88-93.]) show that, when the amide oxygen atom (O3/O13/O23) is trans-related to the pyran oxygen atom of the chromone (O1/O11/O21) the -anti conformation predominates since it permits the establishment of a short intra­molecular N—H⋯O(carbon­yl) hydrogen bond (geometric parameters for the intra­molecular H bond are given in Tables 1[link] and 2[link]), which generates an S(6) ring.

Table 1
Hydrogen-bond geometry (Å, °) for P21/n[link]

D—H⋯A D—H H⋯A DA D—H⋯A
N3—H3⋯O4 0.88 1.96 2.687 (5) 139
C2—H2⋯O4i 0.95 2.38 3.030 (5) 126
C8—H8⋯N33i 0.95 2.56 3.455 (6) 157
Symmetry code: (i) [-x+{\script{1\over 2}}, y+{\script{1\over 2}}, -z+{\script{1\over 2}}].

Table 2
Hydrogen-bond geometry (Å, °) for 1_P2~1~_c[link]

D—H⋯A D—H H⋯A DA D—H⋯A
N13—H13⋯O14 0.80 (4) 1.99 (4) 2.671 (3) 143 (4)
C12—H12⋯O24i 0.95 2.27 2.963 (4) 129
C15—H15⋯O23ii 0.95 2.43 3.353 (4) 164
C136—H13C⋯O13iii 0.98 2.51 3.449 (4) 162
N23—H23⋯O24 0.82 (4) 2.05 (3) 2.697 (3) 136 (3)
C22—H22⋯O14ii 0.95 2.19 2.999 (4) 142
C25—H25⋯O13iv 0.95 2.48 3.352 (4) 153
Symmetry codes: (i) [x+1, -y+{\script{1\over 2}}, z+{\script{1\over 2}}]; (ii) [x, -y+{\script{1\over 2}}, z+{\script{1\over 2}}]; (iii) -x+1, -y+1, -z+1; (iv) [x-1, -y+{\script{1\over 2}}, z-{\script{1\over 2}}].

The S atom of the thia­zole ring is in a -cis position with respect to the carbonyl O3/O23/O13 atom of the amide in both polymorphs. This feature has also been observed for similar compounds (Cagide et al., 2015[Cagide, F., Borges, F., Gomes, L. R. & Low, J. N. (2015). J. Mol. Struct. 1089, 206-215.]). Gas-phase ab initio geometry optimization and natural atomic charges obtained by population analysis [using natural bond orbital (NBO) analysis] revealed that negative charges are located at the two nitro­gen atoms and at the three oxygen atoms, while the positive charges reside at the amide carbon atom as well as at the sulfur atom of the thia­zole ring, suggesting that a further stabilization may arise when the S atom is pointing to the carboxyl oxygen atom of the amide. This was also confirmed here by similar calculations: the results obtained for atomic charges by NBO analysis, performed after single-point energy calculation, are in Fig. 2[link]. In addition, the calculation of energies and charges of several conformers, obtained by rotation of the thia­zole ring (C) around the amide spacer (B) were made, showing that the lowest energy is obtained when the sulfur atom is around 0°. Details are provided in the Supporting information.

[Figure 2]
Figure 2
Natural atomic charges from population analysis (NBO), at the B3LYP/6–311+G(d) level of theory for the 1_P21/n at crystal geometric conformation. The charge distributions are presented within a relative charge range of −1.000 (green) to +1.000 (light red).

Relevant data for the discussion of mol­ecular geometry and conformation of the polymorphs is presented in Table 3[link]; θA–C refers to the dihedral angle between the mean planes of the chromone and thia­zole rings, θA–B to the dihedral angle between the best plane of the chromone and the plane defined by atoms OCN of the amide moiety, whereas θB–C refers to the dihedral angle between this plane and the best plane of the thia­zole ring. Since the heteroaromatic rings are practically planar, the dihedral angle θA–C qu­anti­fies the degree of bend and/or twist between them and can be used for evaluation of the distortion of the mol­ecule from planarity when one of the dihedrals, θA–B or θB–C, is relatively small. As seen, 1_P21/n and 1_P21/c_mol#2 are practically planar while 1_P21/c_mol#1 presents a slightly higher θA–C angle due to the rotation of the chromone ring with respect to the amide plane.

Table 3
Dihedral angles (°)

θA–C is the dihedral angle between the mean planes of the chromene and phenyl ring and the thia­zole ring. θA–B is the dihedral angles between the mean planes of the chromone ring and the plane defined by the O2/C21/N2 atoms. θB–C is the dihedral angle between the mean planes of the thia­zole ring and the plane defined by the O3/C41/N3 atoms.

Compound θA–C° θA–B° θB–C°
1_P21/n 3.1 (2) 1.6 (8) 4.5 (8)
1_P21/c(mol#1) 6.38 (9) 5.12 (19) 1.76 (12)
1_P21/c(mol#2) 3.42 (10) 1.43 (10) 2.01 (14)

3. Supra­molecular features

Mol­ecular structure and conformation

In 1_P21/n the mol­ecules are linked by the C2—H2⋯O4i and C8—H8⋯N33i weak hydrogen bonds, Table 1[link], which form a chain of R22 (13) rings runing parallel to the b-axis direction generated by the twofold screw axis at x = [1\over4] and y = [1\over4], as depicted in Fig. 3[link].

[Figure 3]
Figure 3
The chain of R22(13) rings running parallel to the b axis generated by the twofold screw axis at x = 1/4 and y = 1/4 as depicted for 1_P21/n. H atoms not participating in hydrogen bonding have been omitted for the sake of clarity.

The mol­ecules in 1_P21/c are linked by alternating weakly hydrogen-bonded R22(10) rings formed by the hydrogen bonds C12—H12⋯O24ii and C25—H25⋯O13iv in one case and C22—H22⋯O14ii and C15—H15⋯O23ii in the other, Table 2[link]. These link the mol­ecules to form a chain of rings running parallel to [101], Fig. 4[link]. Details of the ππ stacking are given in Table 4[link]. In 1_P21/n the mol­ecules form a ππ stack that extends along the a axis. In 1_P21/c, the two mol­ecules in the asymmetric unit form a ππ stacked dimer (which guided the choice of asymmetric unit). In both compounds, any possible C—H⋯π contacts involve methyl hydrogen atoms with H⋯π distances in excess of 2.8 Å.

Table 4
Selected π–π contacts (Å)

CgI(J) = Plane number I(J), CgI_Perp = perpendicular distance of Cg(I) on ring J, CgJ_Perp = perpendicular distance of Cg(J) on ring I, slippage = distance between Cg(I) and perpendicular projection of Cg(J) on Ring I.

Compound CgI CgJ(aru) CgCg CgI_Perp CgJ_Perp Slippage
1_P21/n Cg1 Cg2(x + 1, y, z) 3.547 (3) 3.3358 (18) 3.3299 (19) 1.222
1_P21/c Cg3 Cg4(x, y, z) 3.6726 (17) 3.2645 (13) 3.3012 (12) 1.609
Cg1 and Cg2 are the centroids of rings O1/C2–C4/C4A/C8A and C4A/C5–C8/C8A, respectively. Cg3 and Cg4 are the centroids of rings C14A/C15–C18/C18A and O21/C22–C24/C24A/C28A, respectively.
[Figure 4]
Figure 4
The mol­ecules in 1_P21/c linked by alternating weakly hydrogen-bonded R22(10) rings that lead the mol­ecules to form a chain of rings running parallel to [101]. H atoms not participating in hydrogen bonding have been omitted for the sake of clarity.

Hirshfeld surfaces

The Hirshfeld surfaces and two-dimensional fingerprint (FP) plots (Rohl et al., 2008[Rohl, A. L., Moret, M., Kaminsky, W., Claborn, K., McKinnon, J. J. & Kahr, B. (2008). Cryst. Growth Des. 8, 4517-4525.]) provide complementary information concerning the inter­molecular inter­actions discussed above. They were generated using Crystal Explorer 3.1 (Wolff et al., 2012[Wolff, S. K., Grimwood, D. J., McKinnon, J. J., Turner, M. J., Jayatilaka, D. & Spackman, M. A. (2012). Crystal Explorer. The University of Western Australia.]). The Hirshfeld surfaces, mapped over dnorm (all scaled between −0.250 to 1.200) and the respective FP plots are depicted in Figs. 5[link] and 6[link] for 1_P21/n and in Figs. 7[link] and 8[link] for 1_P21/c; mol_#1 and mol_#2. Also in Figs. 5[link] and 9[link], the Hirshfeld surfaces mapped over the electrostatic potential (ESP) are depicted for both polymorphs. The contributions from various contacts, listed in Table 5[link], were selected by the partial analysis of those FP plots. Taking out the H⋯H contacts on the surface that are inherent to organic mol­ecules, the most significant contacts can be divided in three groups: (i) the H⋯O/N contacts that correspond to some relevant C—H⋯O, C—H⋯N inter­molecular inter­actions; (ii) the H⋯C/C⋯H contacts and (iii) C⋯C contacts that are related to ππ stacking. The structure has two carboxyl groups and a nitro­gen atom of the thia­zole that can act as acceptors for hydrogen bonding and a N—H (amide) that can act as donor. In spite of that, the N—H amide does not have a relevant role in the definition of the supra­molecular structure but it is compromised in the inter­molecular hydrogen bond.

Table 5
Percentages for the most relevant atom–atom contacts for the studied compounds

Compound H⋯H H⋯O/O⋯H H⋯N/N⋯H H⋯S/S⋯H H⋯C/C⋯H C⋯C
1_P21/n 31.8 19.0 8.7 6.3 15.2 7.1
1_P21/c 29.6 19.1 8.6 7.7 17.6 5.2
1_P21/c 34.6 13.2 6.6 7.1 18.4 5.2
[Figure 5]
Figure 5
Views of the Hirshfeld surface mapped over dnorm (left) and mapped over the electrostatic potential (right) for 1_P21/n. The highlighted red spots on the top face of the surfaces indicate contact points with the atoms participating in the C—H⋯O/N inter­molecular inter­actions whereas those on the middle of the surface corresponds to C⋯C contacts as a consequence of the ππ stacking. The electrostatic potential surface (ranging from −0.077 to 0.066) shows the complementary electronegative (red) and electropositive areas (blue) with mol­ecules of the first shell. They depict the importance of the H2 and H8 atoms of the chromone ring that are located in the most electropositive area and their connection to O4 and N33. The methyl group presents also an electropositive region that complements with the thio­zole environment near the sulfur atom.
[Figure 6]
Figure 6
The FP plot for 1_P21/n; the light-blue area in the middle of the FP plot is due to C⋯C contacts (7.1% of the area). The FP plot shows three sets of spikes pointing to southwest due to weak C⋯H contacts: the outer sharper ones are due to the H.·N contacts that involves the N(thia­zole)⋯H8—C8(chromone) inter­action followed by the spikes corresponding to O⋯H contacts that englobe the O4⋯H2_C2 contacts and the inner one is due to close S⋯H contacts
[Figure 7]
Figure 7
Views of the Hirshfeld surface mapped over dnorm for 1_P21/c. The highlighted red spots on the top face of the surfaces indicate contact points with the atoms participating in the C—H⋯O/N inter­molecular inter­actions. The red spot identified as a C12—H12⋯O24 contact in mol#1 is located on the hidden face of the surface.
[Figure 8]
Figure 8
The FP plot for 1_P21/c, mol#1 on left and mol#2 on right; The light-blue area in the middle of the FP plot at de/di ∼1.8 Å shows a higher frequency of the pixels that are due to C⋯C contacts (5.2% of the area for each mol­ecule). The spikes pointing to southwest are due to weak O⋯H contacts. The asymmetric tails that both present are corresponding to N⋯H contacts in mol#1. Their asymmetry is due to the fact that they connect two mol­ecules that are not related by crystallographic symmetry.
[Figure 9]
Figure 9
The electrostatic potential surfaces for 1_P21/c, mol#1 and mol#2. The surfaces show the complementary electronegative (red) and electropositive areas (blue) with mol­ecules of the first shell (ranging from −0.077 to 0.066). The ESP is electronegative in the vicinity of oxo oxygen atoms and of the nitro­gen atom of the thia­zole ring while it is electropositive in the areas that surrounds the H2, H5 and H8 hydrogen atoms of the chromone ring.

P21/n polymorph

As seen in Fig. 3[link], in 1_P21/n the oxygen atom O4 acts as acceptor for the hydrogen atom H2 of the chromone and the nitro­gen atom N33 of the thia­zole ring acts as acceptor for the H8 hydrogen atom of the chromone ring. Thus, the Hirshfeld surface of 1_P21/n (mapped with dnorm) shows two sets of complementary red spots in the lateral faces of the surface as highlighted in Fig. 5[link], left. The small red-spot areas facing the chromone plane are due to C⋯C contacts (that assume 7.1% of the contact area) and they correspond to the light-blue area in the middle of the FP plot, Fig. 6[link]. The geometric parameters for these contacts are listed in Tables 3[link] and 5[link]. The weak C⋯H contacts correspond to 15.2% of the surface area. The FP plot shows three sets of spikes pointing to southwest: the outer ones are due to the H⋯N contacts that involves the N(thia­zole)⋯H8—C8(chromone) followed by the spikes corresponding to O⋯H contacts that englobes the O4⋯H2—C2 contacts and the inner one is due to close S⋯H contacts where the closest one is with the H atoms of the methyl group. A small red spot pointing to this group appears in the Hirshfeld surface, Fig. 5[link], left.

In Fig. 5[link] right, the mapping of the mol­ecular electrostatic potential (ESP) in the context of crystal packing is shown. As the Hirshfeld surface partitions of the crystal space give non-overlapping volumes associated with each mol­ecule these surfaces give a kind of `electrostatic complementarity'. The mol­ecular ESP for P21/n reveals red regions of strongly negative electrostatic potential surrounding the two carbonyl regions and the azo region of the thia­zole fragment. The blue region is electropositive and it is predominantly located in the chromone area near the H2 and H8 hydrogen atoms as well as in the methyl group of the thia­zole. The remainder of the Hirshfeld surface is close to neutrality as seen by the grey regions. It is inter­esting to note that the mapped areas with electronegative potential corresponding to the areas covered by the atoms exhibiting negative natural atomic charges as computed by NBO (as seen in Fig. 2[link]) with exception for the thia­zole sulfur atom, which assumes a positive value by adiabatic gas-phase calculations, but gives a slightly negative electrostatic potential area at the Hirsfeld surface. The calculated partial charges show how the mol­ecule would inter­act with an approaching proton and the mol­ecular electrostatic potential is the potential energy that a proton would acquire at the surface, that is depending on the distance to the core nucleus of the mol­ecule, suggesting that, in the crystal the sulfur surroundings experiences a deeper change in the eletrostatic potential gradient than that occurring in the remaining mol­ecule, as compared with that of the adiabatic conditions.

Fig. 5[link] also highlights the electrostatic complementarity of the C—H⋯O/N contacts between the mol­ecules. The electropositive (blue) patch above the chromone ring is in contact with the electronegative (red) regions around the carbonyl oxygen atom of the chromone O4 and the nitro­gen atom of the thia­zole ring N33 while the carbonyl oxygen atom of the amide O3 is pointing to the H5 hydrogen atom of the chromone ring. The electronegativity of this oxygen is lower than the electronegativity of the O4 of the chromone or the nitro­gen atom of the thia­zole N33. Thus the first shell mol­ecular pairs are clearly associated with hydrogen bonds around the chromone ring periphery.

P21/c (mol#1 and #2) polymorph

The Hirshfeld surfaces printed over dnorm for each mol­ecule are shown in Fig. 7[link]. Those surfaces show complementary red spots with each other; since mol#1 is linked to mol#2 and vice versa, they map pairs of dimers that connect the mol­ecules in chains. Here, the hydrogen bonds that contribute to the linking of the mol#1 with mol#2 are the following: (i) the oxo oxygen atom of the chromone of mol#1 acts as acceptor for the H2 hydrogen atom of the chromone of mol#2 (O14⋯H22—C22) and vice versa (O24⋯H12—C12); (ii) the carboxyl oxygen atom of the amide in mol#1 links the hydrogen atom H5 of the chromone ring in mol#2 (O13⋯H25—C25) and vice versa (O23⋯H15—C15); (iii) the nitro­gen atom of the thia­zole in mol#1 acts as acceptor for H8 hydrogen atom of mol#2 (N133⋯H28—C28). The O13⋯H25—C25/ O23⋯H15—C15 bond pair was not present in 1_P21/n polymorph while the remaining two were also observed. There is another pair of blue spots in the Hirshfeld surface of mol#1that are complementary in shape and they refer to the O13⋯H13C—C136 contact.

The FP plots for polymorph 1_P21/c (mol#1 and #2) are shown in Fig. 8[link]. The FP plots highlight the differences in distribution of close contacts between mol#1 and mol#2. The asymmetric tails that are both present correspond to N⋯H contacts in mol#1 and the sharp spikes are due to the O⋯H contacts. Their asymmetry is due to the fact that they connect two mol­ecules that are not related by crystallographic symmetry. The sharper line in mol#1 FP that ends at about (1.2;0.9) corresponds to O⋯H contacts that mol#1 makes with mol#2. Those contacts relate to the ones given by the sharper line that ends at about (0.9; 1.2) in the FP of mol#2. It is noticeable the differences in sharpness of the O⋯H spikes presented in the FP plots 1_P21/c when compared with the FP plot of the polymorph 1_P21/n showing that in 1_P21/c the O⋯H contacts are more directional and shorter. Those plots also reflect the differences regarding the close contacts between mol­ecules: the light blue/green area in the middle of the FP plot in 1_P21/n is less spread out and more intense that the area presented in the FP plot of 1_P21/c suggesting that the C⋯C close contacts are more relevant in first polymorph.

Fig. 9[link] depicts the Hirshfeld surfaces mapped over the electrostatic potential and once again the complementary electrostatic nature of the contacts are clear from the figure. The ESP is electronegative in the vicinity of oxo oxygen atoms and of the nitro­gen atom of the thia­zole ring while it is electropositive in the areas that surrounds the H2, H5 and H8 hydrogen atoms of the chromone ring.

4. Synthesis and crystallization

Chromone-3-carb­oxy­lic acid, phospho­rus(V) oxychloride, di­methyl­formamide (DMF) and 5-methyl­thia­zol-2-amine were purchased from Sigma–Aldrich Química S·A. (Sintra, Portugal). All other reagents and solvents were pro analysis grade and used without additional purification. Thin-layer chromatography (TLC) was carried out on precoated silica gel 60 F254 (Merck) with layer thickness of 0.2 mm and ethyl acetate/petroleum ether as the mobile phase. The spots were visualized under UV detection (254 and 366 nm) and iodine vapour. Flash chromatography was performed using silica gel 60 0.2–0.5 or 0.040–0.063 mm (Carlo Erba Reagents).

Synthesis of N-(5-methyl­thia­zol-2-yl)-4-oxo-4H-chromene-3-carboxamide

To a solution of chromone-3-carb­oxy­lic acid (500 mg, 2.6 mmol) in DMF (4 ml) POCl3 (241 ml, 2.6 mmol) was added. The mixture was stirred at room temperature for 30 min, with the formation in situ of the corresponding acyl chloride. Then, the 5-methyl­thia­zol-2-amine was added. After 12 h, the mixture was diluted with di­chloro­methane (20 ml), washed with H2O (2 × 10 ml) and with saturated NaHCO3 solution (2 × 10 ml). The organic phase was dried with Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by flash chromatography (20% ethyl acetate/petroleum ether) and N-(5-methyl­thia­zol-2-yl)-4-oxo-4H-chromene-3-carboxamide was obtained as a solid (153 mg, 20%). 1H NMR (400 MHz, CDCl3) δ 12.43 (NH, s, 1H), 9.05 (H3,s, 1H), 8.35 (H5, dd, J = 8.0, 1.5 Hz, 1H), 7.80 (H7, ddd, J = 8.7, 7.2, 1.5 Hz, 1H), 7.59 (H8, dd, J = 8.7, 1.6 Hz, 1H), 7.54 (H6, ddd, J = 8.0, 7.2, 1.0 Hz, 1H), 7.17 (H34, q, J = 1.2 Hz, 1H), 2.43 (CH3, d, J = 1.2 Hz, 3H). 13C NMR (101 MHz, CDCl3) δ 176.7 C4), 163.0 (C2), 160.3 (C31), 156.2 (C32), 155.5 (C8a), 135.4 (C7), 135.2 (C34), 128.4 (C35), 126.9 (C5), 126.7 (C6), 124.1 (C4a, C), 118.6 (C8), 114.6 (C3), 11.7 (CH3). EM/IE m/z: 287 (M++1, 30), 286.0 (M+, 91), 174 (30), 173 (100

5. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 6[link]. Crystals of the title compound with different morphologies were found in the crystallized sample. In each case several attempts were made at obtaining crystals which gave the best available data set for both types of morphology; 1_P21/n: the crystals were long needles, which could not be cut, as they shattered. The needle used showed slight streaking on the images. The high angle data were very weak, with significant drop in intensity from the lower angle reflections. These facts probably explain the relatively high R-factor in the refinement of this compound. The following reflections were omitted from the refinement: 0 0 2 and 0 1 1 that were obstructed by beamstop and 0 10 1, 0 11 1, 0 12 1, 0 11 3 as recommend by the PLAT934_ALERT_3_B because (Iobs - Icalc)/Σ w > 1.

Table 6
Experimental details

  P21/n P21/c
Crystal data
Chemical formula C14H10N2O3S C14H10N2O3S
Mr 286.30 286.30
Crystal system, space group Monoclinic, P21/n Monoclinic, P21/c
Temperature (K) 100 100
a, b, c (Å) 4.8722 (4), 12.0436 (10), 21.9803 (16) 7.4646 (5), 30.626 (2), 11.0869 (8)
β (°) 96.353 (8) 93.232 (2)
V3) 1281.86 (18) 2530.6 (3)
Z 4 8
Radiation type Mo Kα Mo Kα
μ (mm−1) 0.26 0.26
Crystal size (mm) 0.28 × 0.03 × 0.02 0.06 × 0.06 × 0.01
 
Data collection
Diffractometer Rigaku Saturn724+ Rigaku Saturn724+
Absorption correction Multi-scan (CrystalClear-SM Expert; Rigaku, 2012[Rigaku (2012). CrystalClear-SM Expert. Rigaku Corporation, Tokyo, Japan.]) Multi-scan (CrystalClear-SM Expert; Rigaku, 2012[Rigaku (2012). CrystalClear-SM Expert. Rigaku Corporation, Tokyo, Japan.])
Tmin, Tmax 0.814, 1.000 0.538, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections 13600, 2944, 1980 15726, 5716, 3733
Rint 0.084 0.090
(sin θ/λ)max−1) 0.651 0.650
 
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.097, 0.223, 1.13 0.060, 0.153, 1.08
No. of reflections 2944 5716
No. of parameters 182 371
H-atom treatment H-atom parameters constrained H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3) 1.15, −0.37 0.46, −0.37
Computer programs: CrystalClear-SM Expert (Rigaku, 2012[Rigaku (2012). CrystalClear-SM Expert. Rigaku Corporation, Tokyo, Japan.]), SHELXT (Sheldrick, 2015a[Sheldrick, G. M. (2015a). Acta Cryst. A71, 3-8.]), SHELXL2014 (Sheldrick, 2015b[Sheldrick, G. M. (2015b). Acta Cryst. C71, 3-8.]), SHELXS and SHELXL (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]), ShelXle (Hübschle et al., 2011[Hübschle, C. B., Sheldrick, G. M. & Dittrich, B. (2011). J. Appl. Cryst. 44, 1281-1284.]), OSCAIL (McArdle et al., 2004[McArdle, P., Gilligan, K., Cunningham, D., Dark, R. & Mahon, M. (2004). CrystEngComm, 6, 303-309.]), Mercury (Macrae et al., 2006[Macrae, C. F., Edgington, P. R., McCabe, P., Pidcock, E., Shields, G. P., Taylor, R., Towler, M. & van de Streek, J. (2006). J. Appl. Cryst. 39, 453-457.]) and PLATON (Spek, 2009[Spek, A. L. (2009). Acta Cryst. D65, 148-155.]).

1_P21/c: the crystals were prismatic in habit. The following reflections were omitted from the refinement: 0 1 1 obstructed by beamstop, [\overline{8}] 1 8, [\overline{8}] 0 6 as recommend by the PLAT934_ALERT_3_B because (Iobs - Icalc)/Σ w > 10.

The hydrogen atoms attached to the carboxamide N atom in 1_P21/n were treated as riding atoms with N—H = 0.88 Å and Uiso(H) = 1.2Ueq(N) while those in 1_P21/c were refined. All other H atoms were treated as riding atoms with C—H(aromatic) = 0.95 Å C—H(meth­yl) = 0.98 Å with Uiso(H) = 1.5Ueq(C). The positions of the amino and methyl hydrogen-atom positions were checked on a final difference map.

Supporting information


Computing details top

For both structures, data collection: CrystalClear-SM Expert (Rigaku, 2012); cell refinement: CrystalClear-SM Expert (Rigaku, 2012); data reduction: CrystalClear-SM Expert (Rigaku, 2012). Program(s) used to solve structure: SHELXT (Sheldrick, 2015a) for 1_P2~1~_n; SHELXS (Sheldrick, 2008) for 1_P2~1~_c. Program(s) used to refine structure: OSCAIL (McArdle et al., 2004), ShelXle (Hübschle et al., 2011) and SHELXL2014 (Sheldrick, 2015b) for 1_P2~1~_n; OSCAIL (McArdle et al., 2004), ShelXle (Hübschle et al., 2011) SHELXL (Sheldrick, 2008) for 1_P2~1~_c. For both structures, molecular graphics: Mercury (Macrae et al., 2006). Software used to prepare material for publication: OSCAIL (McArdle et al., 2004), SHELXL2014 (Sheldrick, 2015b) and PLATON (Spek, 2009) for 1_P2~1~_n; OSCAIL (McArdle et al., 2004), SHELXL (Sheldrick, 2008) for 1_P2~1~_c.

N-(5-Methylthiazol-2-yl)-4-oxo-4H-chromene-3-carboxamide (1_P2~1~_n) top
Crystal data top
C14H10N2O3SF(000) = 592
Mr = 286.30Dx = 1.484 Mg m3
Monoclinic, P21/nMo Kα radiation, λ = 0.71073 Å
a = 4.8722 (4) ÅCell parameters from 3369 reflections
b = 12.0436 (10) Åθ = 2.5–27.5°
c = 21.9803 (16) ŵ = 0.26 mm1
β = 96.353 (8)°T = 100 K
V = 1281.86 (18) Å3Needle, yellow
Z = 40.28 × 0.03 × 0.02 mm
Data collection top
Rigaku Saturn724+
diffractometer
2944 independent reflections
Radiation source: Enhance (Mo) X-ray Source1980 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.084
profile data from ω–scansθmax = 27.5°, θmin = 2.5°
Absorption correction: multi-scan
(CrystalClear-SM Expert; Rigaku, 2012)
h = 66
Tmin = 0.814, Tmax = 1.000k = 1515
13600 measured reflectionsl = 2828
Refinement top
Refinement on F20 restraints
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.097H-atom parameters constrained
wR(F2) = 0.223 w = 1/[σ2(Fo2) + (0.0714P)2 + 3.9146P]
where P = (Fo2 + 2Fc2)/3
S = 1.13(Δ/σ)max = 0.001
2944 reflectionsΔρmax = 1.15 e Å3
182 parametersΔρmin = 0.37 e Å3
Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
S310.9829 (3)0.89007 (11)0.43688 (5)0.0282 (3)
O10.0148 (6)1.0107 (2)0.21301 (14)0.0251 (7)
O30.6328 (7)0.9809 (3)0.34453 (14)0.0297 (8)
O40.1136 (6)0.7088 (3)0.29518 (14)0.0252 (7)
N30.5557 (8)0.7992 (3)0.36084 (16)0.0245 (9)
H30.45310.74130.34890.029*
N330.8145 (9)0.6867 (4)0.43227 (18)0.0323 (10)
C20.1942 (10)0.9927 (4)0.2566 (2)0.0245 (10)
H20.31341.05350.26780.029*
C30.2503 (9)0.8961 (4)0.28596 (19)0.0221 (10)
C40.0784 (9)0.7999 (4)0.27017 (19)0.0211 (9)
C50.3234 (10)0.7340 (4)0.1989 (2)0.0253 (10)
H50.29890.66140.21540.030*
C4A0.1452 (9)0.8189 (4)0.22095 (19)0.0213 (10)
C60.5338 (10)0.7543 (4)0.1535 (2)0.0274 (11)
H60.65470.69590.13890.033*
C70.5705 (10)0.8606 (4)0.1288 (2)0.0272 (11)
H70.71760.87420.09760.033*
C80.3976 (10)0.9455 (4)0.1489 (2)0.0264 (10)
H80.42141.01790.13200.032*
C8A0.1864 (10)0.9224 (4)0.1947 (2)0.0237 (10)
C310.4964 (9)0.8976 (4)0.33283 (19)0.0224 (10)
C320.7694 (10)0.7843 (4)0.4073 (2)0.0283 (11)
C341.0346 (11)0.6953 (5)0.4779 (2)0.0357 (13)
H341.10150.63260.50120.043*
C351.1488 (10)0.7959 (4)0.4877 (2)0.0304 (11)
C3511.3848 (10)0.8291 (5)0.5342 (2)0.0368 (13)
H35A1.45220.76380.55790.055*
H35B1.32130.88510.56180.055*
H35C1.53470.86010.51310.055*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
S310.0245 (7)0.0323 (7)0.0281 (6)0.0009 (6)0.0043 (5)0.0015 (5)
O10.0252 (19)0.0153 (16)0.0340 (17)0.0006 (14)0.0002 (14)0.0028 (13)
O30.030 (2)0.0216 (18)0.0369 (18)0.0055 (15)0.0001 (14)0.0001 (14)
O40.0245 (19)0.0164 (16)0.0349 (17)0.0041 (14)0.0040 (14)0.0008 (13)
N30.024 (2)0.020 (2)0.0289 (19)0.0002 (17)0.0021 (16)0.0030 (15)
N330.035 (3)0.029 (2)0.032 (2)0.006 (2)0.0008 (18)0.0040 (17)
C20.024 (3)0.017 (2)0.034 (2)0.002 (2)0.007 (2)0.0012 (18)
C30.023 (3)0.017 (2)0.028 (2)0.0020 (19)0.0098 (18)0.0005 (17)
C40.022 (2)0.015 (2)0.028 (2)0.0033 (19)0.0093 (18)0.0021 (17)
C50.026 (3)0.020 (2)0.031 (2)0.001 (2)0.009 (2)0.0017 (18)
C4A0.023 (3)0.015 (2)0.028 (2)0.0045 (19)0.0098 (19)0.0027 (17)
C60.025 (3)0.025 (3)0.033 (2)0.003 (2)0.005 (2)0.0058 (19)
C70.027 (3)0.027 (3)0.028 (2)0.001 (2)0.003 (2)0.0012 (18)
C80.026 (3)0.021 (2)0.033 (2)0.005 (2)0.004 (2)0.0036 (18)
C8A0.024 (3)0.017 (2)0.032 (2)0.0016 (19)0.010 (2)0.0032 (18)
C310.023 (3)0.017 (2)0.028 (2)0.000 (2)0.0077 (19)0.0023 (17)
C320.033 (3)0.026 (3)0.027 (2)0.004 (2)0.008 (2)0.0043 (18)
C340.037 (3)0.042 (3)0.026 (2)0.020 (3)0.000 (2)0.002 (2)
C350.025 (3)0.039 (3)0.028 (2)0.007 (2)0.006 (2)0.004 (2)
C3510.027 (3)0.048 (3)0.034 (3)0.004 (3)0.001 (2)0.005 (2)
Geometric parameters (Å, º) top
S31—C321.726 (5)C5—C61.371 (7)
S31—C351.728 (5)C5—C4A1.393 (6)
O1—C21.336 (6)C5—H50.9500
O1—C8A1.384 (5)C4A—C8A1.379 (6)
O3—C311.215 (5)C6—C71.394 (7)
O4—C41.231 (5)C6—H60.9500
N3—C311.353 (6)C7—C81.367 (7)
N3—C321.387 (6)C7—H70.9500
N3—H30.8800C8—C8A1.387 (7)
N33—C321.306 (6)C8—H80.9500
N33—C341.388 (6)C34—C351.341 (7)
C2—C31.344 (6)C34—H340.9500
C2—H20.9500C35—C3511.506 (7)
C3—C41.449 (6)C351—H35A0.9800
C3—C311.492 (7)C351—H35B0.9800
C4—C4A1.466 (6)C351—H35C0.9800
C32—S31—C3588.8 (2)C6—C7—H7119.5
C2—O1—C8A118.1 (4)C7—C8—C8A117.8 (4)
C31—N3—C32123.6 (4)C7—C8—H8121.1
C31—N3—H3118.2C8A—C8—H8121.1
C32—N3—H3118.2C4A—C8A—O1121.2 (4)
C32—N33—C34108.4 (4)C4A—C8A—C8123.2 (4)
O1—C2—C3125.7 (4)O1—C8A—C8115.6 (4)
O1—C2—H2117.2O3—C31—N3122.9 (4)
C3—C2—H2117.2O3—C31—C3122.4 (4)
C2—C3—C4119.7 (4)N3—C31—C3114.8 (4)
C2—C3—C31115.2 (4)N33—C32—N3120.2 (4)
C4—C3—C31125.0 (4)N33—C32—S31116.1 (4)
O4—C4—C3123.9 (4)N3—C32—S31123.7 (4)
O4—C4—C4A121.6 (4)C35—C34—N33117.2 (5)
C3—C4—C4A114.5 (4)C35—C34—H34121.4
C6—C5—C4A120.7 (4)N33—C34—H34121.4
C6—C5—H5119.7C34—C35—C351128.4 (5)
C4A—C5—H5119.7C34—C35—S31109.4 (4)
C8A—C4A—C5117.5 (4)C351—C35—S31122.1 (4)
C8A—C4A—C4120.7 (4)C35—C351—H35A109.5
C5—C4A—C4121.8 (4)C35—C351—H35B109.5
C5—C6—C7120.0 (5)H35A—C351—H35B109.5
C5—C6—H6120.0C35—C351—H35C109.5
C7—C6—H6120.0H35A—C351—H35C109.5
C8—C7—C6120.9 (5)H35B—C351—H35C109.5
C8—C7—H7119.5
C8A—O1—C2—C31.8 (6)C2—O1—C8A—C8179.3 (4)
O1—C2—C3—C40.9 (7)C7—C8—C8A—C4A0.5 (7)
O1—C2—C3—C31179.9 (4)C7—C8—C8A—O1179.3 (4)
C2—C3—C4—O4179.2 (4)C32—N3—C31—O32.9 (7)
C31—C3—C4—O41.9 (7)C32—N3—C31—C3177.4 (4)
C2—C3—C4—C4A1.1 (6)C2—C3—C31—O31.5 (6)
C31—C3—C4—C4A177.8 (4)C4—C3—C31—O3179.6 (4)
C6—C5—C4A—C8A1.1 (6)C2—C3—C31—N3178.2 (4)
C6—C5—C4A—C4178.9 (4)C4—C3—C31—N30.7 (6)
O4—C4—C4A—C8A178.1 (4)C34—N33—C32—N3178.9 (4)
C3—C4—C4A—C8A2.2 (6)C34—N33—C32—S310.4 (5)
O4—C4—C4A—C51.9 (6)C31—N3—C32—N33180.0 (4)
C3—C4—C4A—C5177.8 (4)C31—N3—C32—S311.6 (6)
C4A—C5—C6—C70.2 (7)C35—S31—C32—N330.2 (4)
C5—C6—C7—C80.5 (7)C35—S31—C32—N3178.3 (4)
C6—C7—C8—C8A0.4 (7)C32—N33—C34—C350.9 (6)
C5—C4A—C8A—O1178.5 (4)N33—C34—C35—C351179.2 (4)
C4—C4A—C8A—O11.5 (6)N33—C34—C35—S311.1 (6)
C5—C4A—C8A—C81.2 (7)C32—S31—C35—C340.7 (4)
C4—C4A—C8A—C8178.8 (4)C32—S31—C35—C351179.5 (4)
C2—O1—C8A—C4A0.5 (6)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N3—H3···O40.881.962.687 (5)139
C2—H2···O4i0.952.383.030 (5)126
C8—H8···N33i0.952.563.455 (6)157
Symmetry code: (i) x+1/2, y+1/2, z+1/2.
(1_P2~1~_c) top
Crystal data top
C14H10N2O3SF(000) = 1184
Mr = 286.30Dx = 1.503 Mg m3
Monoclinic, P21/cMo Kα radiation, λ = 0.71075 Å
a = 7.4646 (5) ÅCell parameters from 12722 reflections
b = 30.626 (2) Åθ = 2.3–27.5°
c = 11.0869 (8) ŵ = 0.26 mm1
β = 93.232 (2)°T = 100 K
V = 2530.6 (3) Å3Plate, colourless
Z = 80.06 × 0.06 × 0.01 mm
Data collection top
Rigaku Saturn724+
diffractometer
5716 independent reflections
Radiation source: Sealed Tube3733 reflections with I > 2σ(I)
Graphite Monochromator monochromatorRint = 0.090
Detector resolution: 28.5714 pixels mm-1θmax = 27.5°, θmin = 2.3°
profile data from ω–scansh = 89
Absorption correction: multi-scan
(CrystalClear-SM Expert; Rigaku, 2012)
k = 3739
Tmin = 0.538, Tmax = 1.000l = 1414
15726 measured reflections
Refinement top
Refinement on F20 restraints
Least-squares matrix: fullHydrogen site location: mixed
R[F2 > 2σ(F2)] = 0.060H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.153 w = 1/[σ2(Fo2) + (0.0558P)2 + 1.3609P]
where P = (Fo2 + 2Fc2)/3
S = 1.08(Δ/σ)max < 0.001
5716 reflectionsΔρmax = 0.46 e Å3
371 parametersΔρmin = 0.37 e Å3
Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
S1310.61048 (10)0.46741 (2)0.38319 (7)0.01951 (19)
S2310.12461 (10)0.35373 (2)0.43837 (8)0.0231 (2)
O110.7012 (3)0.25605 (6)0.53314 (18)0.0193 (5)
O140.4476 (3)0.30431 (6)0.22432 (19)0.0210 (5)
O210.1940 (3)0.13877 (6)0.52234 (19)0.0211 (5)
O240.0676 (3)0.19810 (6)0.2322 (2)0.0221 (5)
O1310.6665 (3)0.38847 (6)0.49383 (19)0.0213 (5)
O2310.1912 (3)0.27146 (7)0.5128 (2)0.0254 (5)
N130.5367 (3)0.38401 (8)0.3050 (2)0.0187 (6)
N230.0312 (3)0.27500 (8)0.3342 (3)0.0198 (6)
N1330.4688 (4)0.44311 (8)0.1763 (2)0.0259 (6)
N2330.0482 (3)0.33985 (8)0.2334 (2)0.0232 (6)
C120.6872 (4)0.29895 (9)0.5127 (3)0.0177 (6)
H120.74030.31800.57220.021*
C130.6033 (4)0.31749 (9)0.4141 (3)0.0166 (6)
C140.5230 (4)0.29002 (9)0.3192 (3)0.0161 (6)
C150.4645 (4)0.21215 (9)0.2591 (3)0.0182 (6)
H150.40320.22160.18630.022*
C14A0.5380 (4)0.24282 (9)0.3424 (3)0.0170 (6)
C160.4824 (4)0.16821 (9)0.2840 (3)0.0191 (7)
H160.43440.14740.22750.023*
C170.5706 (4)0.15392 (9)0.3917 (3)0.0209 (7)
H170.58080.12350.40780.025*
C180.6425 (4)0.18345 (9)0.4745 (3)0.0190 (6)
H180.70220.17390.54770.023*
C18A0.6252 (4)0.22810 (9)0.4478 (3)0.0163 (6)
C220.1841 (4)0.18235 (9)0.5132 (3)0.0204 (7)
H220.23990.19920.57680.024*
C230.1006 (4)0.20402 (9)0.4203 (3)0.0171 (6)
C240.0102 (4)0.18040 (10)0.3211 (3)0.0183 (6)
C250.0718 (4)0.10459 (9)0.2489 (3)0.0198 (6)
H250.13430.11650.17950.024*
C24A0.0162 (4)0.13245 (9)0.3338 (3)0.0185 (6)
C260.0676 (4)0.06024 (10)0.2662 (3)0.0245 (7)
H260.12860.04160.20900.029*
C270.0260 (4)0.04218 (10)0.3673 (3)0.0268 (7)
H270.02800.01140.37840.032*
C280.1153 (4)0.06891 (10)0.4511 (3)0.0240 (7)
H280.18110.05690.51900.029*
C28A0.1069 (4)0.11384 (9)0.4338 (3)0.0192 (6)
C1320.5337 (4)0.42830 (9)0.2799 (3)0.0189 (6)
C1340.4804 (4)0.48808 (10)0.1767 (3)0.0277 (8)
H1340.43960.50480.10840.033*
C1350.5518 (4)0.50732 (9)0.2774 (3)0.0210 (7)
C1360.5782 (4)0.55514 (9)0.3022 (3)0.0264 (8)
H13A0.55450.57170.22730.040*
H13B0.70200.56030.33300.040*
H13C0.49530.56460.36240.040*
C1370.6058 (4)0.36610 (9)0.4097 (3)0.0164 (6)
C2320.0293 (4)0.32010 (9)0.3258 (3)0.0190 (6)
C2340.0323 (4)0.38469 (10)0.2497 (3)0.0255 (7)
H2340.08070.40470.19100.031*
C2350.0546 (4)0.39855 (10)0.3522 (3)0.0249 (7)
C2360.0899 (4)0.44428 (10)0.3955 (3)0.0302 (8)
H23A0.03960.46500.33530.045*
H23B0.21960.44900.40710.045*
H23C0.03370.44880.47230.045*
C2370.1123 (4)0.25267 (10)0.4275 (3)0.0190 (6)
H130.499 (5)0.3673 (12)0.255 (3)0.036 (11)*
H230.012 (5)0.2620 (11)0.275 (3)0.032 (11)*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
S1310.0231 (4)0.0159 (3)0.0195 (4)0.0003 (3)0.0008 (3)0.0002 (3)
S2310.0199 (4)0.0218 (4)0.0277 (5)0.0002 (3)0.0006 (3)0.0048 (3)
O110.0246 (10)0.0178 (10)0.0152 (12)0.0001 (8)0.0014 (9)0.0000 (9)
O140.0267 (11)0.0184 (10)0.0171 (12)0.0018 (8)0.0062 (10)0.0013 (9)
O210.0243 (11)0.0237 (11)0.0152 (12)0.0017 (9)0.0007 (9)0.0011 (9)
O240.0275 (11)0.0217 (11)0.0167 (12)0.0010 (9)0.0041 (10)0.0007 (9)
O1310.0270 (11)0.0198 (10)0.0167 (12)0.0008 (8)0.0016 (10)0.0025 (9)
O2310.0274 (11)0.0256 (11)0.0224 (13)0.0002 (9)0.0064 (10)0.0056 (10)
N130.0240 (14)0.0158 (12)0.0159 (14)0.0007 (10)0.0016 (12)0.0013 (11)
N230.0209 (13)0.0196 (13)0.0189 (15)0.0007 (10)0.0010 (12)0.0030 (11)
N1330.0344 (15)0.0225 (13)0.0202 (15)0.0010 (11)0.0038 (13)0.0032 (11)
N2330.0266 (13)0.0237 (13)0.0197 (15)0.0002 (11)0.0040 (12)0.0020 (11)
C120.0201 (14)0.0166 (13)0.0164 (16)0.0023 (11)0.0006 (13)0.0027 (12)
C130.0156 (13)0.0220 (14)0.0125 (15)0.0005 (11)0.0027 (12)0.0000 (12)
C140.0154 (13)0.0192 (14)0.0138 (16)0.0025 (11)0.0015 (12)0.0011 (12)
C150.0179 (14)0.0220 (14)0.0149 (16)0.0012 (11)0.0027 (13)0.0023 (12)
C14A0.0153 (14)0.0210 (14)0.0151 (16)0.0006 (11)0.0053 (12)0.0003 (12)
C160.0210 (14)0.0176 (14)0.0191 (17)0.0033 (11)0.0044 (13)0.0069 (12)
C170.0229 (15)0.0171 (14)0.0232 (18)0.0006 (11)0.0061 (14)0.0005 (13)
C180.0207 (14)0.0199 (14)0.0168 (16)0.0004 (11)0.0040 (13)0.0032 (12)
C18A0.0153 (13)0.0241 (14)0.0096 (15)0.0015 (11)0.0011 (12)0.0043 (12)
C220.0193 (14)0.0230 (15)0.0189 (17)0.0013 (12)0.0014 (13)0.0008 (13)
C230.0141 (13)0.0235 (15)0.0138 (16)0.0002 (11)0.0023 (12)0.0005 (12)
C240.0170 (14)0.0251 (15)0.0128 (15)0.0011 (12)0.0016 (12)0.0020 (12)
C250.0190 (14)0.0238 (14)0.0163 (17)0.0013 (12)0.0013 (13)0.0008 (13)
C24A0.0183 (14)0.0230 (15)0.0145 (16)0.0020 (11)0.0037 (13)0.0009 (12)
C260.0276 (16)0.0228 (15)0.0231 (18)0.0022 (13)0.0018 (15)0.0024 (14)
C270.0302 (17)0.0193 (15)0.031 (2)0.0003 (13)0.0061 (16)0.0029 (14)
C280.0240 (15)0.0268 (16)0.0215 (18)0.0046 (13)0.0023 (14)0.0058 (14)
C28A0.0198 (14)0.0219 (14)0.0163 (16)0.0002 (11)0.0043 (13)0.0002 (13)
C1320.0188 (14)0.0189 (14)0.0190 (17)0.0004 (11)0.0015 (13)0.0015 (13)
C1340.0374 (18)0.0185 (15)0.027 (2)0.0024 (13)0.0001 (16)0.0053 (14)
C1350.0196 (14)0.0195 (14)0.0242 (18)0.0015 (12)0.0047 (14)0.0040 (13)
C1360.0325 (17)0.0174 (15)0.030 (2)0.0011 (13)0.0071 (16)0.0035 (14)
C1370.0128 (13)0.0199 (14)0.0162 (17)0.0013 (11)0.0011 (12)0.0006 (12)
C2320.0187 (14)0.0212 (14)0.0172 (16)0.0003 (11)0.0023 (13)0.0006 (13)
C2340.0291 (17)0.0229 (15)0.0255 (19)0.0014 (13)0.0096 (15)0.0009 (14)
C2350.0200 (15)0.0202 (15)0.035 (2)0.0018 (12)0.0093 (15)0.0016 (14)
C2360.0242 (16)0.0253 (16)0.041 (2)0.0004 (13)0.0024 (16)0.0040 (16)
C2370.0158 (13)0.0240 (15)0.0172 (16)0.0012 (11)0.0010 (13)0.0035 (13)
Geometric parameters (Å, º) top
S131—C1321.732 (3)C16—H160.9500
S131—C1351.733 (3)C17—C181.376 (4)
S231—C2351.736 (3)C17—H170.9500
S231—C2321.739 (3)C18—C18A1.404 (4)
O11—C121.336 (3)C18—H180.9500
O11—C18A1.374 (3)C22—C231.348 (4)
O14—C141.244 (4)C22—H220.9500
O21—C221.340 (3)C23—C241.450 (4)
O21—C28A1.377 (4)C23—C2371.495 (4)
O24—C241.241 (4)C24—C24A1.476 (4)
O131—C1371.223 (3)C25—C261.372 (4)
O231—C2371.229 (4)C25—C24A1.405 (4)
N13—C1371.359 (4)C25—H250.9500
N13—C1321.385 (4)C24A—C28A1.389 (4)
N13—H130.80 (4)C26—C271.401 (5)
N23—C2371.354 (4)C26—H260.9500
N23—C2321.384 (4)C27—C281.381 (4)
N23—H230.82 (4)C27—H270.9500
N133—C1321.302 (4)C28—C28A1.390 (4)
N133—C1341.380 (4)C28—H280.9500
N233—C2321.297 (4)C134—C1351.345 (5)
N233—C2341.389 (4)C134—H1340.9500
C12—C131.354 (4)C135—C1361.501 (4)
C12—H120.9500C136—H13A0.9800
C13—C141.451 (4)C136—H13B0.9800
C13—C1371.490 (4)C136—H13C0.9800
C14—C14A1.472 (4)C234—C2351.346 (5)
C15—C161.379 (4)C234—H2340.9500
C15—C14A1.407 (4)C235—C2361.499 (4)
C15—H150.9500C236—H23A0.9800
C14A—C18A1.381 (4)C236—H23B0.9800
C16—C171.401 (4)C236—H23C0.9800
C132—S131—C13588.76 (15)C28A—C24A—C25118.3 (3)
C235—S231—C23288.58 (16)C28A—C24A—C24119.7 (3)
C12—O11—C18A118.0 (2)C25—C24A—C24122.0 (3)
C22—O21—C28A118.4 (2)C25—C26—C27120.6 (3)
C137—N13—C132124.6 (3)C25—C26—H26119.7
C137—N13—H13116 (3)C27—C26—H26119.7
C132—N13—H13119 (3)C28—C27—C26120.3 (3)
C237—N23—C232123.9 (3)C28—C27—H27119.9
C237—N23—H23120 (3)C26—C27—H27119.9
C232—N23—H23116 (3)C27—C28—C28A118.6 (3)
C132—N133—C134109.0 (3)C27—C28—H28120.7
C232—N233—C234109.1 (3)C28A—C28—H28120.7
O11—C12—C13125.3 (3)O21—C28A—C24A122.1 (3)
O11—C12—H12117.3O21—C28A—C28115.8 (3)
C13—C12—H12117.3C24A—C28A—C28122.1 (3)
C12—C13—C14119.7 (3)N133—C132—N13121.3 (3)
C12—C13—C137116.1 (3)N133—C132—S131115.8 (2)
C14—C13—C137124.1 (3)N13—C132—S131122.9 (2)
O14—C14—C13123.9 (3)C135—C134—N133117.5 (3)
O14—C14—C14A121.3 (3)C135—C134—H134121.3
C13—C14—C14A114.7 (3)N133—C134—H134121.3
C16—C15—C14A119.3 (3)C134—C135—C136128.4 (3)
C16—C15—H15120.3C134—C135—S131109.0 (2)
C14A—C15—H15120.3C136—C135—S131122.6 (3)
C18A—C14A—C15119.0 (3)C135—C136—H13A109.5
C18A—C14A—C14119.8 (3)C135—C136—H13B109.5
C15—C14A—C14121.2 (3)H13A—C136—H13B109.5
C15—C16—C17120.8 (3)C135—C136—H13C109.5
C15—C16—H16119.6H13A—C136—H13C109.5
C17—C16—H16119.6H13B—C136—H13C109.5
C18—C17—C16120.7 (3)O131—C137—N13122.1 (3)
C18—C17—H17119.7O131—C137—C13122.6 (3)
C16—C17—H17119.7N13—C137—C13115.2 (3)
C17—C18—C18A118.1 (3)N233—C232—N23121.4 (3)
C17—C18—H18120.9N233—C232—S231115.9 (2)
C18A—C18—H18120.9N23—C232—S231122.7 (2)
O11—C18A—C14A122.4 (3)C235—C234—N233117.1 (3)
O11—C18A—C18115.6 (3)C235—C234—H234121.5
C14A—C18A—C18122.0 (3)N233—C234—H234121.5
O21—C22—C23124.7 (3)C234—C235—C236129.3 (3)
O21—C22—H22117.7C234—C235—S231109.3 (2)
C23—C22—H22117.7C236—C235—S231121.4 (3)
C22—C23—C24120.6 (3)C235—C236—H23A109.5
C22—C23—C237115.3 (3)C235—C236—H23B109.5
C24—C23—C237124.1 (3)H23A—C236—H23B109.5
O24—C24—C23124.2 (3)C235—C236—H23C109.5
O24—C24—C24A121.4 (3)H23A—C236—H23C109.5
C23—C24—C24A114.5 (3)H23B—C236—H23C109.5
C26—C25—C24A120.1 (3)O231—C237—N23121.7 (3)
C26—C25—H25119.9O231—C237—C23122.1 (3)
C24A—C25—H25119.9N23—C237—C23116.1 (3)
C18A—O11—C12—C130.1 (4)C22—O21—C28A—C28177.2 (2)
O11—C12—C13—C141.3 (4)C25—C24A—C28A—O21178.9 (2)
O11—C12—C13—C137179.4 (2)C24—C24A—C28A—O210.6 (4)
C12—C13—C14—O14178.1 (3)C25—C24A—C28A—C281.0 (4)
C137—C13—C14—O140.1 (4)C24—C24A—C28A—C28179.3 (2)
C12—C13—C14—C14A1.5 (4)C27—C28—C28A—O21178.0 (2)
C137—C13—C14—C14A179.4 (2)C27—C28—C28A—C24A1.8 (4)
C16—C15—C14A—C18A0.5 (4)C134—N133—C132—N13179.2 (2)
C16—C15—C14A—C14179.7 (2)C134—N133—C132—S1310.4 (3)
O14—C14—C14A—C18A178.9 (2)C137—N13—C132—N133178.4 (3)
C13—C14—C14A—C18A0.6 (4)C137—N13—C132—S1312.9 (4)
O14—C14—C14A—C151.2 (4)C135—S131—C132—N1330.5 (2)
C13—C14—C14A—C15179.2 (2)C135—S131—C132—N13179.2 (2)
C14A—C15—C16—C170.8 (4)C132—N133—C134—C1350.1 (4)
C15—C16—C17—C180.5 (4)N133—C134—C135—C136179.3 (3)
C16—C17—C18—C18A0.1 (4)N133—C134—C135—S1310.3 (4)
C12—O11—C18A—C14A0.8 (4)C132—S131—C135—C1340.4 (2)
C12—O11—C18A—C18179.4 (2)C132—S131—C135—C136179.5 (2)
C15—C14A—C18A—O11179.6 (2)C132—N13—C137—O1312.8 (4)
C14—C14A—C18A—O110.5 (4)C132—N13—C137—C13176.9 (2)
C15—C14A—C18A—C180.1 (4)C12—C13—C137—O1315.8 (4)
C14—C14A—C18A—C18179.7 (2)C14—C13—C137—O131176.1 (3)
C17—C18—C18A—O11179.3 (2)C12—C13—C137—N13173.8 (2)
C17—C18—C18A—C14A0.4 (4)C14—C13—C137—N134.2 (4)
C28A—O21—C22—C232.9 (4)C234—N233—C232—N23179.0 (2)
O21—C22—C23—C241.0 (4)C234—N233—C232—S2310.5 (3)
O21—C22—C23—C237178.0 (2)C237—N23—C232—N233179.0 (3)
C22—C23—C24—O24179.2 (3)C237—N23—C232—S2312.6 (4)
C237—C23—C24—O240.3 (4)C235—S231—C232—N2330.4 (2)
C22—C23—C24—C24A1.2 (4)C235—S231—C232—N23178.9 (2)
C237—C23—C24—C24A180.0 (2)C232—N233—C234—C2350.3 (4)
C26—C25—C24A—C28A0.3 (4)N233—C234—C235—C236178.9 (3)
C26—C25—C24A—C24177.9 (3)N233—C234—C235—S2310.0 (3)
O24—C24—C24A—C28A179.0 (3)C232—S231—C235—C2340.2 (2)
C23—C24—C24A—C28A1.3 (4)C232—S231—C235—C236179.2 (2)
O24—C24—C24A—C252.8 (4)C232—N23—C237—O2310.0 (4)
C23—C24—C24A—C25176.9 (2)C232—N23—C237—C23179.7 (2)
C24A—C25—C26—C270.8 (4)C22—C23—C237—O2310.6 (4)
C25—C26—C27—C280.0 (4)C24—C23—C237—O231179.5 (3)
C26—C27—C28—C28A1.3 (4)C22—C23—C237—N23179.2 (2)
C22—O21—C28A—C24A2.7 (4)C24—C23—C237—N230.3 (4)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N13—H13···O140.80 (4)1.99 (4)2.671 (3)143 (4)
C12—H12···O24i0.952.272.963 (4)129
C15—H15···O23ii0.952.433.353 (4)164
C136—H13C···O13iii0.982.513.449 (4)162
N23—H23···O240.82 (4)2.05 (3)2.697 (3)136 (3)
C22—H22···O14ii0.952.192.999 (4)142
C25—H25···O13iv0.952.483.352 (4)153
Symmetry codes: (i) x+1, y+1/2, z+1/2; (ii) x, y+1/2, z+1/2; (iii) x+1, y+1, z+1; (iv) x1, y+1/2, z1/2.
Dihedral angles (°) top
θA–C is the dihedral angle between the mean planes of the chromene and phenyl ring and the thiazole ring. θA–B is the dihedral angles between the mean planes of the chromone ring and the plane defined by the O2/C21/N2 atoms. θB–C is the dihedral angle between the mean planes of the thiazole ring and the plane defined by the O3/C41/N3 atoms.
CompoundθA–B°θA–B°θA–C°
1_P21/n3.1 (2)1.6 (8)4.5 (8)
1_P21/c(mol#1)6.38 (9)5.12 (19)1.76 (12)
1_P21/c(mol#2)3.42 (10)1.43 (10)2.01 (14)
Selected ππ contacts (Å) top
CgI(J) = Plane number I(J), CgI_Perp = perpendicular distance of Cg(I) on ring J, CgJ_Perp = perpendicular distance of Cg(J) on ring I, slippage = distance between Cg(I) and perpendicular projection of Cg(J) on Ring I.
CompoundCgICgJ(aru)Cg···CgCgI_PerpCgJ_PerpSlippage Å
1_P21/nCg1Cg2(x + 1, y, z)3.547 (3)3.3358 (18)3.3299 (19)1.222
1_P21/cCg3Cg4(x, y, z)3.6726 (17)3.2645 (13)3.3012 (12)1.609
Cg1 and Cg2 are the centroids of rings O1/C2–C4/C4A/C8A and C4A/C5–C8/C8A, respectively. Cg3 and Cg4 are the centroids of rings C14A/C15–C18/C18A and O21/C22–C24/C24A/C28A, respectively.
Percentages for the most relevant atom–atom contacts for the studied compounds top
CompoundH···HH···O/O···HH···N/N···HH···S/S···HH···C/C···HC···C
1_P21/n31.819.08.76.315.27.1
1_P21/c29.619.18.67.717.65.2
1_P21/c34.613.26.67.118.45.2
 

Acknowledgements

The authors thank the National Crystallographic Service, University of Southampton for the data collection and for their help and advice (Coles & Gale, 2012[Coles, S. J. & Gale, P. A. (2012). Chem. Sci. 3, 683-689.]).

Funding information

This work was supported by the Portuguese Foundation for Science and Technology (FCT) (PEst-C/QUI/UI0081/2013 and UID/Multi/04546/2013 to FC), (SFRH/BPD/74491/2010 grants are supported by FCT).

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