organic compounds
4-[3-(1-Naphthyloxymethyl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazin-6-yl]-3-p-tolylsydnone
aX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, and bDepartment of Studies in Chemistry, Mangalore University, Mangalagangotri, Mangalore 574 199, India
*Correspondence e-mail: hkfun@usm.my
In the title sydnone compound, C24H18N6O3S {systematic name: 4-[3-(1-naphthyloxymethyl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazin-6-yl]-3-p-tolyl-4,5-dihydro-1,2,3-oxadiazol-3-ium-5-olate} an intramolecular C—H⋯O hydrogen bond generates an S(6) ring motif. The 3,6-dihydro-1,3,4-thiadiazine ring adopts a twist-boat conformation. The essentially planar 1,2,3-oxadiazole and 1,2,4-triazole rings [maximum deviations of 0.006 (1) and 0.008 (1) Å, respectively] are inclined to one another at interplanar angle of 44.11 (4)°. The naphthalene unit forms an interplanar angle of 66.40 (4)° with the 1,2,4-triazole ring. In the crystal packing, pairs of intermolecular C—H⋯O hydrogen bonds link adjacent molecules into dimers incorporating R22(12) ring motifs. Further stabilization is provided by weak C—H⋯π interactions.
Related literature
For general background to and applications of the title sydnone compound, see: Baker et al. (1949); Hedge et al. (2008); Rai et al. (2008). For graph-set descriptions of hydrogen-bond ring motifs, see: Bernstein et al. (1995). For related structures, see: Baker & Ollis (1957); Goh et al. (2010a,b,c). For the stability of the temperature controller used for the data collection, see: Cosier & Glazer (1986).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536810017812/lh5045sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810017812/lh5045Isup2.hkl
An equimolar mixture of 3-naphthyloxymethyl-4-amino-5-mercapto-1,2,4-triazoles (0.01 mol) and 4-bromoacetyl-3-tolylsydnones (0.01 mol) in absolute ethanol was heated under reflux for 10-12 h. The solution was concentrated, cooled to room temperature and neutralized with 10 % sodium bicarbonate solution. Solid product formed was collected by filtration and recrystallized from ethanol. Single crystals for X-ray analysis were obtained from a 1:2 mixture of DMF and ethanol by slow evaporation.
All hydrogen atoms were located from difference Fourier map [range of C—H = 0.945 (17)–1.028 (16) Å] and allowed to refine freely.
Sydnones constitute a well-defined class of
consisting of 1,2,3-oxadiazole ring system. The introduction of the concept of mesoionic structure for certain in the year 1949 has proved to be a fruitful development in heterocyclic chemistry (Baker et al., 1949). The study of still remains a field of interest because of their electronic structures and also because of the various types of biological activities displayed by some of them. Interest in sydnone derivatives has also been encouraged by the discovery that they exhibit various pharmacological activities (Hedge et al., 2008; Rai et al., 2008).A series of triazolothiadiazines were synthesized by the condensation of 4-bromoacetyl-3-aryl
with 3-aryloxymethyl-4-amino-5-mercapto-1,2,4-triazoles. 4-Bromoacetyl-3-aryl were in turn obtained by the photochemical bromination of 4-acetyl-3-aryl 3-Aryloxymethyl-4-amino-5-mercapto-1,2,4-triazoles were prepared, starting from the potassium salt of aryloxyacetyl with carbon disulphide in alcoholic KOH. The were in turn prepared from the corresponding These aryloxymethyl were prepared by the reaction of appropriately substituted phenol with ethylchloroacetate in presence of anhydrous potassium carbonate in dry acetone medium.In the title sydnone compound, an intramolecular C14—H14B···O3 hydrogen bond (Table 1) generates a six-membered ring, producing an S(6) hydrogen bond ring motif (Fig. 1, Bernstein et al., 1995). The 3,6-dihydro-1,3,4-thiadiazine ring adopts a twist-boat conformation, with puckering parameters of Q = 0.6251 (7) Å, θ = 112.76 (6)° and φ = 142.75 (7)° (Cremer & Pople, 1975). The 1,2,3-oxadiazole (C16/C17/O2/N5/N6) and 1,2,4-triazole (C12/N1/N2/C13/N3) rings are essentially planar, with maximum deviations of 0.006 (1) and -0.008 (1) Å, respectively, at atoms C16 and N1. The interplanar angle between these two rings is 44.11 (4)°. The C18–C23 benzene ring and C1–C10 naphthalene ring system are making interplanar angles of 69.72 (4) and 66.40 (4)°, with the 1,2,3-oxadiazole and 1,2,4-triazole rings, respectively. As reported previously (Goh et al., 2010a,b), the exocyclic C17–O3 bond length [1.2126 (9) Å] of the sydnone unit is inconsistent with the formulation of Baker & Ollis (1957), which reported the delocalization of a positive charge in the 1,2,3-oxadiazole ring, and a negative charge in the exocyclic oxygen. The bond lengths and angles are within normal ranges and comparable to those reported in closely related sydnone (Goh et al., 2010a,b) and 1,2,4-triazole (Goh et al., 2010c) structures.
In the crystal packing, pairs of intermolecular C14—H14B···O3[-x, -y+2, -z+1] hydrogen bonds (Table 1) link adjacent molecules into dimers incorporating R22(12) ring motifs (Fig. 2, Bernstein et al., 1995). Further stabilization is provided by weak C8—H8A···Cg1 [x, -y+3/2, z-3/2] and C24—H24C···Cg2 interactions (Table 1) involving the C18-C23 (Cg1) and C1/C6-C10 (Cg2) benzene rings.
For general background to and applications of the title sydnone compound, see: Baker et al. (1949); Hedge et al. (2008); Rai et al. (2008). For graph-set descriptions of hydrogen-bond ring motifs, see: Bernstein et al. (1995). For related structures, see: Baker & Ollis (1957); Goh et al. (2010a,b,c). For the stability of the temperature controller used for the data collection, see: Cosier & Glazer (1986).
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. The molecular structure of the title compound, showing 30% probability displacement ellipsoids for non-H atoms and the atom-numbering scheme. An intramolecular hydrogen bond is shown as dashed line. | |
Fig. 2. The crystal structure of the title compound, viewed along the c axis, showing adjacent molecules being linked into dimers. Hydrogen atoms not involved in intermolecular interactions (dashed lines) have been omitted for clarity. |
C24H18N6O3S | F(000) = 976 |
Mr = 470.50 | Dx = 1.455 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 9918 reflections |
a = 21.6096 (8) Å | θ = 2.6–35.1° |
b = 8.3622 (3) Å | µ = 0.19 mm−1 |
c = 11.9272 (4) Å | T = 100 K |
β = 94.694 (1)° | Block, colourless |
V = 2148.06 (13) Å3 | 0.82 × 0.28 × 0.22 mm |
Z = 4 |
Bruker APEXII DUO CCD area-detector diffractometer | 9432 independent reflections |
Radiation source: fine-focus sealed tube | 8048 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.023 |
φ and ω scans | θmax = 35.1°, θmin = 1.9° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −34→34 |
Tmin = 0.857, Tmax = 0.959 | k = −13→11 |
30407 measured reflections | l = −19→17 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.036 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.110 | All H-atom parameters refined |
S = 1.08 | w = 1/[σ2(Fo2) + (0.0621P)2 + 0.4207P] where P = (Fo2 + 2Fc2)/3 |
9432 reflections | (Δ/σ)max = 0.001 |
379 parameters | Δρmax = 0.58 e Å−3 |
0 restraints | Δρmin = −0.31 e Å−3 |
C24H18N6O3S | V = 2148.06 (13) Å3 |
Mr = 470.50 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 21.6096 (8) Å | µ = 0.19 mm−1 |
b = 8.3622 (3) Å | T = 100 K |
c = 11.9272 (4) Å | 0.82 × 0.28 × 0.22 mm |
β = 94.694 (1)° |
Bruker APEXII DUO CCD area-detector diffractometer | 9432 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 8048 reflections with I > 2σ(I) |
Tmin = 0.857, Tmax = 0.959 | Rint = 0.023 |
30407 measured reflections |
R[F2 > 2σ(F2)] = 0.036 | 0 restraints |
wR(F2) = 0.110 | All H-atom parameters refined |
S = 1.08 | Δρmax = 0.58 e Å−3 |
9432 reflections | Δρmin = −0.31 e Å−3 |
379 parameters |
Experimental. The crystal was placed in the cold stream of an Oxford Cryosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1)K. |
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. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2sigma(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
S1 | 0.054237 (8) | 0.64796 (2) | 0.368050 (17) | 0.01458 (5) | |
O1 | 0.25803 (3) | 0.72732 (8) | 0.06654 (5) | 0.01628 (11) | |
O2 | 0.09850 (3) | 1.30606 (7) | 0.46932 (5) | 0.01662 (11) | |
O3 | 0.00745 (3) | 1.17152 (8) | 0.43365 (5) | 0.01799 (11) | |
N1 | 0.14829 (3) | 0.50393 (9) | 0.12173 (6) | 0.01643 (12) | |
N2 | 0.11061 (3) | 0.46927 (8) | 0.20910 (6) | 0.01603 (12) | |
N3 | 0.12737 (3) | 0.72984 (8) | 0.20468 (6) | 0.01263 (11) | |
N4 | 0.13693 (3) | 0.88576 (8) | 0.24115 (6) | 0.01300 (11) | |
N5 | 0.15806 (3) | 1.29814 (8) | 0.43898 (6) | 0.01614 (12) | |
N6 | 0.15941 (3) | 1.17335 (8) | 0.37354 (5) | 0.01269 (11) | |
C1 | 0.35987 (4) | 0.77223 (11) | 0.01602 (7) | 0.01752 (14) | |
C2 | 0.38308 (4) | 0.65856 (13) | 0.09650 (8) | 0.02498 (18) | |
C3 | 0.44556 (5) | 0.62503 (19) | 0.10958 (11) | 0.0366 (3) | |
C4 | 0.48733 (5) | 0.7049 (2) | 0.04353 (11) | 0.0389 (3) | |
C5 | 0.46585 (5) | 0.81610 (17) | −0.03400 (10) | 0.0320 (2) | |
C6 | 0.40179 (4) | 0.85376 (12) | −0.05035 (8) | 0.02161 (16) | |
C7 | 0.37898 (5) | 0.97005 (13) | −0.12929 (8) | 0.02567 (18) | |
C8 | 0.31662 (5) | 0.99837 (12) | −0.14608 (8) | 0.02419 (17) | |
C9 | 0.27387 (4) | 0.91590 (10) | −0.08351 (7) | 0.01914 (14) | |
C10 | 0.29522 (4) | 0.80784 (10) | −0.00217 (7) | 0.01503 (13) | |
C11 | 0.19294 (3) | 0.75150 (10) | 0.04109 (7) | 0.01550 (13) | |
C12 | 0.15819 (3) | 0.65872 (9) | 0.12197 (7) | 0.01378 (12) | |
C13 | 0.09846 (3) | 0.60679 (9) | 0.25608 (7) | 0.01354 (12) | |
C14 | 0.03560 (3) | 0.85027 (9) | 0.31981 (7) | 0.01418 (12) | |
C15 | 0.09438 (3) | 0.94058 (9) | 0.30182 (6) | 0.01176 (11) | |
C16 | 0.10454 (3) | 1.09342 (9) | 0.35705 (6) | 0.01216 (11) | |
C17 | 0.06224 (4) | 1.18116 (9) | 0.41931 (6) | 0.01406 (12) | |
C18 | 0.21821 (3) | 1.14204 (9) | 0.32812 (6) | 0.01316 (12) | |
C19 | 0.22339 (4) | 1.16937 (10) | 0.21476 (7) | 0.01628 (13) | |
C20 | 0.28120 (4) | 1.14737 (11) | 0.17364 (7) | 0.01943 (15) | |
C21 | 0.33262 (4) | 1.10009 (11) | 0.24445 (8) | 0.02073 (15) | |
C22 | 0.32506 (4) | 1.07116 (11) | 0.35765 (8) | 0.02126 (15) | |
C23 | 0.26765 (4) | 1.09216 (10) | 0.40109 (7) | 0.01746 (14) | |
C24 | 0.39559 (5) | 1.08553 (16) | 0.19990 (11) | 0.0326 (2) | |
H2A | 0.3546 (7) | 0.602 (2) | 0.1375 (14) | 0.036 (4)* | |
H3A | 0.4629 (9) | 0.548 (3) | 0.1663 (17) | 0.056 (5)* | |
H4A | 0.5305 (9) | 0.677 (3) | 0.0521 (16) | 0.053 (5)* | |
H5A | 0.4945 (7) | 0.876 (2) | −0.0788 (14) | 0.033 (4)* | |
H7A | 0.4102 (7) | 1.029 (2) | −0.1753 (13) | 0.035 (4)* | |
H8A | 0.3011 (7) | 1.076 (2) | −0.2028 (14) | 0.038 (4)* | |
H9A | 0.2288 (6) | 0.9413 (19) | −0.0985 (11) | 0.024 (3)* | |
H11A | 0.1812 (6) | 0.7163 (18) | −0.0368 (11) | 0.020 (3)* | |
H11B | 0.1818 (6) | 0.8606 (17) | 0.0462 (12) | 0.021 (3)* | |
H14A | 0.0118 (6) | 0.8427 (17) | 0.2483 (12) | 0.020 (3)* | |
H14B | 0.0114 (6) | 0.8965 (17) | 0.3770 (11) | 0.017 (3)* | |
H19A | 0.1867 (6) | 1.1991 (18) | 0.1683 (12) | 0.022 (3)* | |
H20A | 0.2844 (7) | 1.1636 (18) | 0.0939 (13) | 0.026 (3)* | |
H22A | 0.3595 (7) | 1.039 (2) | 0.4079 (12) | 0.029 (4)* | |
H23A | 0.2619 (6) | 1.0695 (19) | 0.4794 (12) | 0.026 (3)* | |
H24A | 0.4217 (10) | 1.175 (3) | 0.2286 (18) | 0.059 (6)* | |
H24B | 0.4133 (8) | 0.985 (3) | 0.2221 (16) | 0.049 (5)* | |
H24C | 0.3950 (8) | 1.088 (3) | 0.1166 (16) | 0.048 (5)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.01306 (8) | 0.01134 (8) | 0.01984 (9) | −0.00084 (5) | 0.00436 (6) | 0.00005 (6) |
O1 | 0.0125 (2) | 0.0195 (3) | 0.0170 (2) | 0.00011 (19) | 0.00242 (18) | 0.0030 (2) |
O2 | 0.0204 (2) | 0.0124 (2) | 0.0174 (3) | 0.00013 (19) | 0.00400 (19) | −0.00343 (19) |
O3 | 0.0160 (2) | 0.0173 (3) | 0.0211 (3) | 0.00308 (19) | 0.0046 (2) | −0.0018 (2) |
N1 | 0.0154 (3) | 0.0131 (3) | 0.0211 (3) | 0.0009 (2) | 0.0029 (2) | −0.0035 (2) |
N2 | 0.0145 (2) | 0.0116 (3) | 0.0221 (3) | 0.0004 (2) | 0.0027 (2) | −0.0025 (2) |
N3 | 0.0116 (2) | 0.0099 (2) | 0.0166 (3) | −0.00056 (18) | 0.00252 (19) | −0.0028 (2) |
N4 | 0.0138 (2) | 0.0095 (2) | 0.0160 (3) | −0.00074 (19) | 0.0026 (2) | −0.0023 (2) |
N5 | 0.0197 (3) | 0.0124 (3) | 0.0165 (3) | −0.0018 (2) | 0.0026 (2) | −0.0030 (2) |
N6 | 0.0151 (2) | 0.0103 (2) | 0.0127 (2) | −0.00127 (19) | 0.00128 (19) | −0.00056 (19) |
C1 | 0.0156 (3) | 0.0205 (4) | 0.0168 (3) | −0.0006 (3) | 0.0035 (2) | 0.0003 (3) |
C2 | 0.0160 (3) | 0.0350 (5) | 0.0239 (4) | 0.0015 (3) | 0.0015 (3) | 0.0093 (4) |
C3 | 0.0175 (4) | 0.0562 (8) | 0.0361 (5) | 0.0061 (4) | 0.0015 (4) | 0.0177 (5) |
C4 | 0.0160 (4) | 0.0603 (8) | 0.0409 (6) | 0.0026 (4) | 0.0059 (4) | 0.0126 (6) |
C5 | 0.0191 (4) | 0.0453 (6) | 0.0330 (5) | −0.0026 (4) | 0.0101 (3) | 0.0052 (5) |
C6 | 0.0192 (3) | 0.0255 (4) | 0.0211 (4) | −0.0014 (3) | 0.0076 (3) | 0.0003 (3) |
C7 | 0.0299 (4) | 0.0239 (4) | 0.0250 (4) | −0.0017 (3) | 0.0131 (3) | 0.0031 (3) |
C8 | 0.0317 (4) | 0.0186 (4) | 0.0238 (4) | 0.0049 (3) | 0.0116 (3) | 0.0057 (3) |
C9 | 0.0232 (3) | 0.0163 (3) | 0.0187 (3) | 0.0054 (3) | 0.0064 (3) | 0.0023 (3) |
C10 | 0.0163 (3) | 0.0147 (3) | 0.0145 (3) | 0.0004 (2) | 0.0043 (2) | −0.0007 (2) |
C11 | 0.0135 (3) | 0.0165 (3) | 0.0167 (3) | 0.0022 (2) | 0.0025 (2) | −0.0007 (2) |
C12 | 0.0127 (3) | 0.0127 (3) | 0.0161 (3) | 0.0013 (2) | 0.0021 (2) | −0.0032 (2) |
C13 | 0.0108 (2) | 0.0109 (3) | 0.0189 (3) | −0.0006 (2) | 0.0010 (2) | −0.0012 (2) |
C14 | 0.0111 (3) | 0.0116 (3) | 0.0199 (3) | 0.0005 (2) | 0.0022 (2) | −0.0014 (2) |
C15 | 0.0114 (2) | 0.0099 (3) | 0.0140 (3) | 0.0004 (2) | 0.0010 (2) | −0.0006 (2) |
C16 | 0.0130 (3) | 0.0099 (3) | 0.0138 (3) | −0.0001 (2) | 0.0023 (2) | −0.0011 (2) |
C17 | 0.0171 (3) | 0.0111 (3) | 0.0142 (3) | 0.0018 (2) | 0.0023 (2) | −0.0007 (2) |
C18 | 0.0131 (3) | 0.0115 (3) | 0.0149 (3) | −0.0018 (2) | 0.0018 (2) | −0.0002 (2) |
C19 | 0.0180 (3) | 0.0167 (3) | 0.0142 (3) | −0.0019 (2) | 0.0018 (2) | −0.0010 (2) |
C20 | 0.0211 (3) | 0.0196 (4) | 0.0182 (3) | −0.0039 (3) | 0.0059 (3) | −0.0048 (3) |
C21 | 0.0164 (3) | 0.0175 (3) | 0.0289 (4) | −0.0023 (3) | 0.0054 (3) | −0.0079 (3) |
C22 | 0.0153 (3) | 0.0194 (4) | 0.0286 (4) | −0.0002 (3) | −0.0009 (3) | 0.0002 (3) |
C23 | 0.0169 (3) | 0.0162 (3) | 0.0189 (3) | −0.0019 (2) | −0.0010 (2) | 0.0029 (3) |
C24 | 0.0192 (4) | 0.0360 (6) | 0.0440 (6) | −0.0028 (4) | 0.0112 (4) | −0.0160 (5) |
S1—C13 | 1.7390 (8) | C7—C8 | 1.3667 (14) |
S1—C14 | 1.8214 (8) | C7—H7A | 1.028 (16) |
O1—C10 | 1.3707 (10) | C8—C9 | 1.4138 (12) |
O1—C11 | 1.4289 (9) | C8—H8A | 0.980 (17) |
O2—N5 | 1.3667 (9) | C9—C10 | 1.3775 (12) |
O2—C17 | 1.4086 (10) | C9—H9A | 0.998 (14) |
O3—C17 | 1.2126 (9) | C11—C12 | 1.4882 (11) |
N1—C12 | 1.3119 (10) | C11—H11A | 0.988 (14) |
N1—N2 | 1.4044 (10) | C11—H11B | 0.946 (14) |
N2—C13 | 1.3151 (10) | C14—C15 | 1.5080 (10) |
N3—C12 | 1.3704 (10) | C14—H14A | 0.962 (14) |
N3—C13 | 1.3739 (10) | C14—H14B | 0.974 (13) |
N3—N4 | 1.3846 (9) | C15—C16 | 1.4464 (10) |
N4—C15 | 1.2994 (9) | C16—C17 | 1.4272 (10) |
N5—N6 | 1.3049 (9) | C18—C19 | 1.3849 (11) |
N6—C16 | 1.3612 (9) | C18—C23 | 1.3860 (11) |
N6—C18 | 1.4454 (10) | C19—C20 | 1.3910 (12) |
C1—C2 | 1.4134 (13) | C19—H19A | 0.962 (14) |
C1—C6 | 1.4246 (12) | C20—C21 | 1.3967 (13) |
C1—C10 | 1.4275 (11) | C20—H20A | 0.969 (15) |
C2—C3 | 1.3752 (13) | C21—C22 | 1.3943 (14) |
C2—H2A | 0.945 (17) | C21—C24 | 1.5058 (13) |
C3—C4 | 1.4134 (16) | C22—C23 | 1.3941 (12) |
C3—H3A | 0.99 (2) | C22—H22A | 0.954 (15) |
C4—C5 | 1.3659 (18) | C23—H23A | 0.971 (14) |
C4—H4A | 0.96 (2) | C24—H24A | 0.98 (2) |
C5—C6 | 1.4174 (14) | C24—H24B | 0.96 (2) |
C5—H5A | 0.986 (16) | C24—H24C | 0.993 (19) |
C6—C7 | 1.4139 (14) | ||
C13—S1—C14 | 93.58 (4) | C12—C11—H11B | 108.4 (8) |
C10—O1—C11 | 114.75 (6) | H11A—C11—H11B | 107.5 (12) |
N5—O2—C17 | 110.81 (6) | N1—C12—N3 | 109.94 (7) |
C12—N1—N2 | 107.84 (6) | N1—C12—C11 | 127.14 (7) |
C13—N2—N1 | 106.48 (6) | N3—C12—C11 | 122.76 (7) |
C12—N3—C13 | 105.17 (6) | N2—C13—N3 | 110.54 (7) |
C12—N3—N4 | 124.47 (6) | N2—C13—S1 | 129.92 (6) |
C13—N3—N4 | 128.81 (6) | N3—C13—S1 | 119.53 (6) |
C15—N4—N3 | 114.39 (6) | C15—C14—S1 | 110.06 (5) |
N6—N5—O2 | 105.36 (6) | C15—C14—H14A | 107.6 (8) |
N5—N6—C16 | 114.66 (6) | S1—C14—H14A | 107.9 (8) |
N5—N6—C18 | 115.62 (6) | C15—C14—H14B | 114.1 (8) |
C16—N6—C18 | 129.71 (6) | S1—C14—H14B | 105.4 (8) |
C2—C1—C6 | 119.52 (8) | H14A—C14—H14B | 111.6 (11) |
C2—C1—C10 | 122.14 (8) | N4—C15—C16 | 118.51 (6) |
C6—C1—C10 | 118.34 (8) | N4—C15—C14 | 123.04 (7) |
C3—C2—C1 | 120.31 (9) | C16—C15—C14 | 118.43 (6) |
C3—C2—H2A | 121.0 (10) | N6—C16—C17 | 105.06 (6) |
C1—C2—H2A | 118.6 (10) | N6—C16—C15 | 126.71 (6) |
C2—C3—C4 | 120.42 (11) | C17—C16—C15 | 127.69 (6) |
C2—C3—H3A | 121.6 (11) | O3—C17—O2 | 120.35 (7) |
C4—C3—H3A | 117.9 (11) | O3—C17—C16 | 135.53 (7) |
C5—C4—C3 | 120.13 (10) | O2—C17—C16 | 104.10 (6) |
C5—C4—H4A | 120.8 (12) | C19—C18—C23 | 122.88 (7) |
C3—C4—H4A | 119.1 (12) | C19—C18—N6 | 118.68 (7) |
C4—C5—C6 | 121.22 (9) | C23—C18—N6 | 118.38 (7) |
C4—C5—H5A | 121.1 (10) | C18—C19—C20 | 117.98 (7) |
C6—C5—H5A | 117.6 (10) | C18—C19—H19A | 118.5 (8) |
C7—C6—C5 | 121.86 (9) | C20—C19—H19A | 123.5 (8) |
C7—C6—C1 | 119.75 (8) | C19—C20—C21 | 121.14 (8) |
C5—C6—C1 | 118.39 (9) | C19—C20—H20A | 117.8 (9) |
C8—C7—C6 | 120.17 (8) | C21—C20—H20A | 121.0 (9) |
C8—C7—H7A | 121.4 (9) | C22—C21—C20 | 118.96 (8) |
C6—C7—H7A | 118.4 (9) | C22—C21—C24 | 120.57 (9) |
C7—C8—C9 | 121.15 (9) | C20—C21—C24 | 120.44 (9) |
C7—C8—H8A | 119.6 (9) | C23—C22—C21 | 121.09 (8) |
C9—C8—H8A | 119.2 (9) | C23—C22—H22A | 118.3 (8) |
C10—C9—C8 | 119.73 (8) | C21—C22—H22A | 120.6 (8) |
C10—C9—H9A | 122.1 (8) | C18—C23—C22 | 117.92 (8) |
C8—C9—H9A | 118.1 (8) | C18—C23—H23A | 120.7 (8) |
O1—C10—C9 | 124.35 (7) | C22—C23—H23A | 121.4 (8) |
O1—C10—C1 | 114.90 (7) | C21—C24—H24A | 108.9 (12) |
C9—C10—C1 | 120.74 (7) | C21—C24—H24B | 109.1 (11) |
O1—C11—C12 | 109.19 (6) | H24A—C24—H24B | 111.9 (16) |
O1—C11—H11A | 109.2 (8) | C21—C24—H24C | 114.4 (10) |
C12—C11—H11A | 110.5 (8) | H24A—C24—H24C | 107.1 (17) |
O1—C11—H11B | 112.0 (8) | H24B—C24—H24C | 105.4 (16) |
C12—N1—N2—C13 | 1.48 (8) | C12—N3—C13—N2 | 0.23 (8) |
C12—N3—N4—C15 | 165.86 (7) | N4—N3—C13—N2 | −165.83 (7) |
C13—N3—N4—C15 | −30.53 (10) | C12—N3—C13—S1 | 179.55 (5) |
C17—O2—N5—N6 | −0.43 (8) | N4—N3—C13—S1 | 13.50 (10) |
O2—N5—N6—C16 | −0.38 (9) | C14—S1—C13—N2 | −153.37 (8) |
O2—N5—N6—C18 | 178.66 (6) | C14—S1—C13—N3 | 27.46 (6) |
C6—C1—C2—C3 | −0.97 (16) | C13—S1—C14—C15 | −53.80 (6) |
C10—C1—C2—C3 | 178.48 (11) | N3—N4—C15—C16 | 171.38 (6) |
C1—C2—C3—C4 | 0.6 (2) | N3—N4—C15—C14 | −6.97 (10) |
C2—C3—C4—C5 | 0.0 (2) | S1—C14—C15—N4 | 51.78 (9) |
C3—C4—C5—C6 | −0.2 (2) | S1—C14—C15—C16 | −126.57 (6) |
C4—C5—C6—C7 | 179.19 (13) | N5—N6—C16—C17 | 1.00 (9) |
C4—C5—C6—C1 | −0.20 (18) | C18—N6—C16—C17 | −177.88 (7) |
C2—C1—C6—C7 | −178.65 (9) | N5—N6—C16—C15 | −171.03 (7) |
C10—C1—C6—C7 | 1.88 (13) | C18—N6—C16—C15 | 10.09 (12) |
C2—C1—C6—C5 | 0.75 (14) | N4—C15—C16—N6 | −15.34 (11) |
C10—C1—C6—C5 | −178.72 (9) | C14—C15—C16—N6 | 163.09 (7) |
C5—C6—C7—C8 | 177.25 (11) | N4—C15—C16—C17 | 174.40 (7) |
C1—C6—C7—C8 | −3.36 (15) | C14—C15—C16—C17 | −7.18 (11) |
C6—C7—C8—C9 | 1.64 (16) | N5—O2—C17—O3 | −177.66 (7) |
C7—C8—C9—C10 | 1.61 (15) | N5—O2—C17—C16 | 1.00 (8) |
C11—O1—C10—C9 | 5.75 (11) | N6—C16—C17—O3 | 177.21 (9) |
C11—O1—C10—C1 | −174.30 (7) | C15—C16—C17—O3 | −10.86 (15) |
C8—C9—C10—O1 | 176.86 (8) | N6—C16—C17—O2 | −1.15 (8) |
C8—C9—C10—C1 | −3.09 (13) | C15—C16—C17—O2 | 170.78 (7) |
C2—C1—C10—O1 | 1.93 (12) | N5—N6—C18—C19 | −108.58 (8) |
C6—C1—C10—O1 | −178.61 (7) | C16—N6—C18—C19 | 70.29 (11) |
C2—C1—C10—C9 | −178.12 (9) | N5—N6—C18—C23 | 68.82 (9) |
C6—C1—C10—C9 | 1.34 (12) | C16—N6—C18—C23 | −112.31 (9) |
C10—O1—C11—C12 | −179.64 (6) | C23—C18—C19—C20 | −0.86 (12) |
N2—N1—C12—N3 | −1.37 (9) | N6—C18—C19—C20 | 176.42 (7) |
N2—N1—C12—C11 | −176.75 (7) | C18—C19—C20—C21 | −0.37 (13) |
C13—N3—C12—N1 | 0.74 (8) | C19—C20—C21—C22 | 1.50 (13) |
N4—N3—C12—N1 | 167.57 (7) | C19—C20—C21—C24 | −176.65 (9) |
C13—N3—C12—C11 | 176.36 (7) | C20—C21—C22—C23 | −1.45 (14) |
N4—N3—C12—C11 | −16.80 (11) | C24—C21—C22—C23 | 176.69 (9) |
O1—C11—C12—N1 | −76.16 (10) | C19—C18—C23—C22 | 0.90 (12) |
O1—C11—C12—N3 | 109.01 (8) | N6—C18—C23—C22 | −176.38 (7) |
N1—N2—C13—N3 | −1.03 (8) | C21—C22—C23—C18 | 0.29 (13) |
N1—N2—C13—S1 | 179.73 (6) |
Cg1 and Cg2 are the centroids of the C18–C23 and C1/C6–C10 benzene rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
C14—H14B···O3 | 0.973 (13) | 2.401 (14) | 3.0928 (10) | 127.7 (10) |
C14—H14B···O3i | 0.973 (13) | 2.396 (13) | 3.1612 (10) | 135.2 (11) |
C8—H8A···Cg1ii | 0.980 (17) | 2.603 (17) | 3.3928 (11) | 138.0 (13) |
C24—H24C···Cg2 | 0.993 (19) | 2.95 (2) | 3.7066 (14) | 134.3 (17) |
Symmetry codes: (i) −x, −y+2, −z+1; (ii) x, −y+3/2, z−3/2. |
Experimental details
Crystal data | |
Chemical formula | C24H18N6O3S |
Mr | 470.50 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 21.6096 (8), 8.3622 (3), 11.9272 (4) |
β (°) | 94.694 (1) |
V (Å3) | 2148.06 (13) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.19 |
Crystal size (mm) | 0.82 × 0.28 × 0.22 |
Data collection | |
Diffractometer | Bruker APEXII DUO CCD area-detector diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.857, 0.959 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 30407, 9432, 8048 |
Rint | 0.023 |
(sin θ/λ)max (Å−1) | 0.808 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.036, 0.110, 1.08 |
No. of reflections | 9432 |
No. of parameters | 379 |
H-atom treatment | All H-atom parameters refined |
Δρmax, Δρmin (e Å−3) | 0.58, −0.31 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
Cg1 and Cg2 are the centroids of the C18–C23 and C1/C6–C10 benzene rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
C14—H14B···O3 | 0.973 (13) | 2.401 (14) | 3.0928 (10) | 127.7 (10) |
C14—H14B···O3i | 0.973 (13) | 2.396 (13) | 3.1612 (10) | 135.2 (11) |
C8—H8A···Cg1ii | 0.980 (17) | 2.603 (17) | 3.3928 (11) | 138.0 (13) |
C24—H24C···Cg2 | 0.993 (19) | 2.95 (2) | 3.7066 (14) | 134.3 (17) |
Symmetry codes: (i) −x, −y+2, −z+1; (ii) x, −y+3/2, z−3/2. |
Acknowledgements
The authors thank Universiti Sains Malaysia (USM) for the Research University Golden Goose grant (No. 1001/PFIZIK/811012). JHG also thanks USM for the award of a USM fellowship.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Sydnones constitute a well-defined class of mesoionic compounds consisting of 1,2,3-oxadiazole ring system. The introduction of the concept of mesoionic structure for certain heterocyclic compounds in the year 1949 has proved to be a fruitful development in heterocyclic chemistry (Baker et al., 1949). The study of sydnones still remains a field of interest because of their electronic structures and also because of the various types of biological activities displayed by some of them. Interest in sydnone derivatives has also been encouraged by the discovery that they exhibit various pharmacological activities (Hedge et al., 2008; Rai et al., 2008).
A series of triazolothiadiazines were synthesized by the condensation of 4-bromoacetyl-3-aryl sydnones with 3-aryloxymethyl-4-amino-5-mercapto-1,2,4-triazoles. 4-Bromoacetyl-3-aryl sydnones were in turn obtained by the photochemical bromination of 4-acetyl-3-aryl sydnones. 3-Aryloxymethyl-4-amino-5-mercapto-1,2,4-triazoles were prepared, starting from the potassium salt of aryloxyacetyl hydrazines with carbon disulphide in alcoholic KOH. The hydrazides were in turn prepared from the corresponding esters. These aryloxymethyl esters were prepared by the reaction of appropriately substituted phenol with ethylchloroacetate in presence of anhydrous potassium carbonate in dry acetone medium.
In the title sydnone compound, an intramolecular C14—H14B···O3 hydrogen bond (Table 1) generates a six-membered ring, producing an S(6) hydrogen bond ring motif (Fig. 1, Bernstein et al., 1995). The 3,6-dihydro-1,3,4-thiadiazine ring adopts a twist-boat conformation, with puckering parameters of Q = 0.6251 (7) Å, θ = 112.76 (6)° and φ = 142.75 (7)° (Cremer & Pople, 1975). The 1,2,3-oxadiazole (C16/C17/O2/N5/N6) and 1,2,4-triazole (C12/N1/N2/C13/N3) rings are essentially planar, with maximum deviations of 0.006 (1) and -0.008 (1) Å, respectively, at atoms C16 and N1. The interplanar angle between these two rings is 44.11 (4)°. The C18–C23 benzene ring and C1–C10 naphthalene ring system are making interplanar angles of 69.72 (4) and 66.40 (4)°, with the 1,2,3-oxadiazole and 1,2,4-triazole rings, respectively. As reported previously (Goh et al., 2010a,b), the exocyclic C17–O3 bond length [1.2126 (9) Å] of the sydnone unit is inconsistent with the formulation of Baker & Ollis (1957), which reported the delocalization of a positive charge in the 1,2,3-oxadiazole ring, and a negative charge in the exocyclic oxygen. The bond lengths and angles are within normal ranges and comparable to those reported in closely related sydnone (Goh et al., 2010a,b) and 1,2,4-triazole (Goh et al., 2010c) structures.
In the crystal packing, pairs of intermolecular C14—H14B···O3[-x, -y+2, -z+1] hydrogen bonds (Table 1) link adjacent molecules into dimers incorporating R22(12) ring motifs (Fig. 2, Bernstein et al., 1995). Further stabilization is provided by weak C8—H8A···Cg1 [x, -y+3/2, z-3/2] and C24—H24C···Cg2 interactions (Table 1) involving the C18-C23 (Cg1) and C1/C6-C10 (Cg2) benzene rings.