organic compounds
H-chromeno[2,3-b]pyridin-5(10aH)-one
of 1-methyl-2-methylamino-3-nitro-1aDepartment of Physics, Presidency College (Autonomous), Chennai 600 005, India, and bOrganic Chemistry Division, CSIR Central Leather Research Institute, Adyar, Chennai 600 020, India
*Correspondence e-mail: raja.13nap@gmail.com
In the title compound, C14H13N3O4, the pyran ring adopts an with the methine C atom as the flap. The dihedral angle between the benzene and hydropyridine rings is 29.33 (3)°. The methylamine C atom deviates from the plane of its attached ring by 0.380 (5) Å and an intramolecular N—H⋯O hydrogen bond closes an S(6) ring. In the crystal, weak C—H⋯O hydrogen bonds and aromatic π–π stacking interactions [centroid–centroid distances vary from 3.6529 (10) to 3.6872 (10) Å] link the molecules, generating a three-dimensional network.
Keywords: crystal structure; chromene; hydrogen bonding; π–π stacking.
CCDC reference: 1421106
1. Related literature
For the uses and biological importance of chromenes, see: Ercole et al. (2009); Geen et al. (1996); Khan et al. (2010); Raj et al. (2010).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: APEX2 (Bruker, 2008); cell SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supporting information
CCDC reference: 1421106
https://doi.org/10.1107/S2056989015018241/hb7515sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989015018241/hb7515Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S2056989015018241/hb7515Isup3.cml
A mixture of 3-formylchromone (1 mmol), N,N'-dimethyl-2-nitroethene-1, 1-diamine (1 mmol) in ethanol (3 ml) and a catalytic amount (0.050 mmol) of In(OTf)3 was added and refluxed for about 30 minutes. The product was purified by
(5/95 % Ethylacetate/petether) to afford the pure product in 94 % yield. The purified compound was recrystalised from DMSO-D6 by using slow evaporation method to yield colourless blocks.N and C-bound H atoms were positioned geometrically (C–H = 0.93–0.98 Å) and allowed to ride on their parent atoms, with Uiso(H) = 1.5Ueq(C) for methyl H atoms and 1.2Ueq(C) for all other H atoms.
Chromene derivatives are very important
that have a variety of industrial, biological and chemical synthesis applications (Geen et al., 1996; Ercole et al., 2009). They exhibit a number of pharmacological activities such as anti-HIV, anti-inflammatory, anti-bacterial, anti-allergic, anti-cancer etc. (Khan et al., 2010; Raj et al., 2010). Against this backround, X-ray analysis of the title compound has been carried out to study its structural aspects.The molecular structure of the title molecule is shown in Fig. 1. The pyran ring (C1-C7-O4-C8-C13-C14) adopts a θ are 0.475 (16)Å and 117.5 (2)°, respectively. The dihedral angle between the mean planes of the chromeno ring system (fusion of benzene and pyran rings) and the pyridine ring is 29.37 (7)°. The pyridine ring mean planes forms a dihedral angle of 31.22 (8)° with phenyl ring (C8-C13). The atoms O3 deviates by -0.295Å from the chromeno ring mean plane (O4/C1-C7).
with the deviation of atoms O4 and C14 from the mean plane through atoms (C1-C7-C8-C13) being 0.475 and -0.095Å, respectively. The smallest displacement asymmetry parameters q2 and q3 are 0.421 (17) and -0.219 (17)Å. The ring parameters Q and phase angleAn intramolecular N—H···O and N—H···N interaction occurs. In the crystal, molecules are linked by C—H···O hydrogen bonds, forming inversion dimers with an R22(8) ring motif. The molecules are linked via C—H···O hydrogen bonds, forming ribbons along [110] dirction. There are a number of π—π interactions present linking the ribbons and forming a three dimensional structure [ Cg2-Cg3i =3.6529 (10)Å, Cg2-Cg3ii = 3.6871 (10)Å and Cg3-Cg2iii = 3.6528 (10)Å; where Cg2 and Cg3 are the centroids of the N3/C4/C3/C2/C1/C7 and C8/C13 rings, respectively; symmetry codes: (i) -x,-y,-z; (ii) 1/4+x,1/4-y, 1/4+z; (iii) -1/4+x,1/4-y,-1/4+z].
For the uses and biological importance of chromenes, see: Ercole et al. (2009); Geen et al. (1996); Khan et al. (2010); Raj et al. (2010).
Data collection: APEX2 (Bruker, 2008); cell
SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).Fig. 1. Molecular structure of the title compound, with displacement ellipsoids drawn at the 30% probability level. | |
Fig. 2. Viewed down the c axis of the crystal packing of the title compound. The hydrogen bonds are shown as dashed lines (see Table 1 for details) |
C14H13N3O4 | F(000) = 2400 |
Mr = 287.27 | Dx = 1.496 Mg m−3 |
Orthorhombic, Fdd2 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: F 2 -2d | Cell parameters from 2096 reflections |
a = 24.0182 (13) Å | θ = 2.3–25.0° |
b = 26.8445 (14) Å | µ = 0.11 mm−1 |
c = 7.9140 (4) Å | T = 293 K |
V = 5102.6 (5) Å3 | Block, colourless |
Z = 16 | 0.35 × 0.30 × 0.25 mm |
Bruker SMART APEXII CCD diffractometer | 2261 independent reflections |
Radiation source: fine-focus sealed tube | 2096 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.021 |
ω and φ scans | θmax = 25.0°, θmin = 2.3° |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | h = −27→28 |
Tmin = 0.962, Tmax = 0.972 | k = −31→31 |
12952 measured reflections | l = −9→9 |
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)] = 0.030 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.076 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0468P)2 + 1.3678P] where P = (Fo2 + 2Fc2)/3 |
2261 reflections | (Δ/σ)max < 0.001 |
192 parameters | Δρmax = 0.11 e Å−3 |
1 restraint | Δρmin = −0.14 e Å−3 |
C14H13N3O4 | V = 5102.6 (5) Å3 |
Mr = 287.27 | Z = 16 |
Orthorhombic, Fdd2 | Mo Kα radiation |
a = 24.0182 (13) Å | µ = 0.11 mm−1 |
b = 26.8445 (14) Å | T = 293 K |
c = 7.9140 (4) Å | 0.35 × 0.30 × 0.25 mm |
Bruker SMART APEXII CCD diffractometer | 2261 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | 2096 reflections with I > 2σ(I) |
Tmin = 0.962, Tmax = 0.972 | Rint = 0.021 |
12952 measured reflections |
R[F2 > 2σ(F2)] = 0.030 | 1 restraint |
wR(F2) = 0.076 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | Δρmax = 0.11 e Å−3 |
2261 reflections | Δρmin = −0.14 e Å−3 |
192 parameters |
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 | ||
C1 | 0.03152 (7) | 0.07119 (6) | 0.5103 (2) | 0.0316 (4) | |
C2 | 0.07422 (7) | 0.05817 (6) | 0.6093 (2) | 0.0348 (4) | |
H2 | 0.0673 | 0.0483 | 0.7200 | 0.042* | |
C3 | 0.12950 (7) | 0.05908 (6) | 0.5492 (2) | 0.0348 (4) | |
C4 | 0.14101 (7) | 0.07284 (6) | 0.3758 (2) | 0.0323 (4) | |
C5 | 0.21801 (8) | 0.07230 (9) | 0.1521 (3) | 0.0562 (6) | |
H5A | 0.1937 | 0.0565 | 0.0723 | 0.084* | |
H5B | 0.2531 | 0.0551 | 0.1543 | 0.084* | |
H5C | 0.2239 | 0.1063 | 0.1193 | 0.084* | |
C6 | 0.10471 (8) | 0.10996 (8) | 0.1107 (2) | 0.0514 (5) | |
H6A | 0.1378 | 0.1300 | 0.1095 | 0.077* | |
H6B | 0.0731 | 0.1305 | 0.0853 | 0.077* | |
H6C | 0.1078 | 0.0841 | 0.0275 | 0.077* | |
C7 | 0.04068 (6) | 0.08867 (6) | 0.33547 (19) | 0.0305 (4) | |
H7 | 0.0273 | 0.1231 | 0.3273 | 0.037* | |
C8 | −0.04681 (7) | 0.05675 (6) | 0.2547 (2) | 0.0315 (4) | |
C9 | −0.08276 (7) | 0.04527 (7) | 0.1229 (2) | 0.0400 (4) | |
H9 | −0.0692 | 0.0389 | 0.0149 | 0.048* | |
C10 | −0.13915 (8) | 0.04360 (7) | 0.1563 (3) | 0.0439 (5) | |
H10 | −0.1637 | 0.0361 | 0.0691 | 0.053* | |
C11 | −0.16010 (8) | 0.05281 (7) | 0.3162 (3) | 0.0428 (5) | |
H11 | −0.1983 | 0.0528 | 0.3352 | 0.051* | |
C12 | −0.12390 (8) | 0.06192 (7) | 0.4459 (3) | 0.0403 (4) | |
H12 | −0.1377 | 0.0669 | 0.5543 | 0.048* | |
C13 | −0.06647 (7) | 0.06394 (6) | 0.4184 (2) | 0.0333 (4) | |
C14 | −0.02720 (8) | 0.06748 (6) | 0.5610 (2) | 0.0353 (4) | |
O1 | 0.22180 (6) | 0.04252 (6) | 0.6136 (2) | 0.0619 (4) | |
O2 | 0.15774 (6) | 0.02632 (7) | 0.79971 (18) | 0.0710 (5) | |
O3 | −0.04181 (6) | 0.06418 (6) | 0.70928 (16) | 0.0523 (4) | |
O4 | 0.00911 (5) | 0.05848 (4) | 0.21703 (15) | 0.0356 (3) | |
N1 | 0.17083 (7) | 0.04246 (6) | 0.6569 (2) | 0.0458 (4) | |
N2 | 0.19283 (6) | 0.07078 (5) | 0.3198 (2) | 0.0409 (4) | |
H2A | 0.2169 | 0.0679 | 0.3996 | 0.049* | |
N3 | 0.09766 (5) | 0.08753 (5) | 0.27888 (17) | 0.0339 (3) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0321 (9) | 0.0326 (9) | 0.0300 (9) | 0.0013 (7) | −0.0007 (7) | −0.0038 (7) |
C2 | 0.0399 (10) | 0.0385 (9) | 0.0262 (9) | −0.0023 (7) | −0.0043 (7) | −0.0041 (7) |
C3 | 0.0317 (9) | 0.0351 (9) | 0.0376 (9) | 0.0000 (7) | −0.0096 (8) | −0.0021 (7) |
C4 | 0.0279 (9) | 0.0299 (8) | 0.0392 (9) | −0.0020 (7) | −0.0050 (8) | −0.0021 (8) |
C5 | 0.0371 (11) | 0.0692 (14) | 0.0622 (13) | 0.0076 (9) | 0.0087 (10) | 0.0000 (12) |
C6 | 0.0379 (10) | 0.0763 (14) | 0.0399 (10) | 0.0030 (9) | 0.0018 (9) | 0.0174 (10) |
C7 | 0.0282 (9) | 0.0317 (8) | 0.0315 (8) | 0.0012 (6) | −0.0022 (7) | −0.0017 (7) |
C8 | 0.0280 (9) | 0.0310 (9) | 0.0356 (9) | 0.0027 (6) | −0.0001 (7) | 0.0029 (7) |
C9 | 0.0395 (10) | 0.0425 (10) | 0.0378 (9) | −0.0006 (8) | −0.0079 (8) | −0.0006 (8) |
C10 | 0.0364 (10) | 0.0426 (10) | 0.0527 (12) | −0.0032 (8) | −0.0143 (9) | 0.0029 (9) |
C11 | 0.0283 (10) | 0.0424 (10) | 0.0577 (12) | 0.0009 (8) | −0.0010 (9) | 0.0047 (9) |
C12 | 0.0334 (9) | 0.0393 (10) | 0.0483 (11) | 0.0010 (8) | 0.0041 (9) | 0.0015 (8) |
C13 | 0.0318 (9) | 0.0304 (8) | 0.0376 (9) | 0.0028 (7) | 0.0014 (8) | 0.0007 (7) |
C14 | 0.0376 (10) | 0.0344 (9) | 0.0338 (10) | 0.0029 (7) | 0.0032 (8) | −0.0027 (8) |
O1 | 0.0335 (8) | 0.0824 (10) | 0.0697 (11) | 0.0039 (7) | −0.0197 (7) | 0.0028 (9) |
O2 | 0.0627 (10) | 0.1090 (14) | 0.0414 (8) | 0.0052 (9) | −0.0172 (7) | 0.0141 (9) |
O3 | 0.0468 (8) | 0.0771 (11) | 0.0330 (7) | 0.0008 (7) | 0.0074 (6) | −0.0042 (7) |
O4 | 0.0274 (7) | 0.0480 (7) | 0.0315 (6) | −0.0005 (5) | −0.0014 (5) | −0.0065 (5) |
N1 | 0.0422 (10) | 0.0525 (10) | 0.0427 (10) | 0.0006 (7) | −0.0168 (8) | −0.0015 (8) |
N2 | 0.0252 (8) | 0.0485 (9) | 0.0492 (9) | −0.0011 (6) | −0.0038 (7) | −0.0018 (8) |
N3 | 0.0263 (7) | 0.0419 (8) | 0.0334 (8) | 0.0003 (6) | −0.0005 (6) | 0.0026 (6) |
C1—C2 | 1.337 (2) | C7—O4 | 1.4527 (19) |
C1—C14 | 1.470 (2) | C7—H7 | 0.9800 |
C1—C7 | 1.478 (2) | C8—O4 | 1.3767 (19) |
C2—C3 | 1.410 (2) | C8—C9 | 1.389 (2) |
C2—H2 | 0.9300 | C8—C13 | 1.392 (2) |
C3—N1 | 1.383 (2) | C9—C10 | 1.381 (3) |
C3—C4 | 1.448 (3) | C9—H9 | 0.9300 |
C4—N2 | 1.322 (2) | C10—C11 | 1.384 (3) |
C4—N3 | 1.352 (2) | C10—H10 | 0.9300 |
C5—N2 | 1.459 (3) | C11—C12 | 1.367 (3) |
C5—H5A | 0.9600 | C11—H11 | 0.9300 |
C5—H5B | 0.9600 | C12—C13 | 1.398 (2) |
C5—H5C | 0.9600 | C12—H12 | 0.9300 |
C6—N3 | 1.471 (2) | C13—C14 | 1.474 (2) |
C6—H6A | 0.9600 | C14—O3 | 1.228 (2) |
C6—H6B | 0.9600 | O1—N1 | 1.271 (2) |
C6—H6C | 0.9600 | O2—N1 | 1.250 (2) |
C7—N3 | 1.440 (2) | N2—H2A | 0.8600 |
C2—C1—C14 | 123.98 (15) | O4—C8—C13 | 121.86 (15) |
C2—C1—C7 | 121.15 (15) | C9—C8—C13 | 121.26 (16) |
C14—C1—C7 | 114.82 (14) | C10—C9—C8 | 118.23 (18) |
C1—C2—C3 | 121.34 (16) | C10—C9—H9 | 120.9 |
C1—C2—H2 | 119.3 | C8—C9—H9 | 120.9 |
C3—C2—H2 | 119.3 | C9—C10—C11 | 121.74 (18) |
N1—C3—C2 | 117.53 (16) | C9—C10—H10 | 119.1 |
N1—C3—C4 | 121.99 (16) | C11—C10—H10 | 119.1 |
C2—C3—C4 | 120.25 (15) | C12—C11—C10 | 119.15 (17) |
N2—C4—N3 | 123.19 (16) | C12—C11—H11 | 120.4 |
N2—C4—C3 | 119.11 (15) | C10—C11—H11 | 120.4 |
N3—C4—C3 | 117.71 (15) | C11—C12—C13 | 121.18 (18) |
N2—C5—H5A | 109.5 | C11—C12—H12 | 119.4 |
N2—C5—H5B | 109.5 | C13—C12—H12 | 119.4 |
H5A—C5—H5B | 109.5 | C8—C13—C12 | 118.32 (16) |
N2—C5—H5C | 109.5 | C8—C13—C14 | 120.29 (15) |
H5A—C5—H5C | 109.5 | C12—C13—C14 | 120.99 (16) |
H5B—C5—H5C | 109.5 | O3—C14—C1 | 122.65 (16) |
N3—C6—H6A | 109.5 | O3—C14—C13 | 122.98 (17) |
N3—C6—H6B | 109.5 | C1—C14—C13 | 114.19 (15) |
H6A—C6—H6B | 109.5 | C8—O4—C7 | 112.85 (13) |
N3—C6—H6C | 109.5 | O2—N1—O1 | 119.09 (16) |
H6A—C6—H6C | 109.5 | O2—N1—C3 | 119.25 (16) |
H6B—C6—H6C | 109.5 | O1—N1—C3 | 121.65 (16) |
N3—C7—O4 | 106.47 (12) | C4—N2—C5 | 133.91 (16) |
N3—C7—C1 | 115.21 (13) | C4—N2—H2A | 113.0 |
O4—C7—C1 | 110.46 (13) | C5—N2—H2A | 113.0 |
N3—C7—H7 | 108.2 | C4—N3—C7 | 124.17 (14) |
O4—C7—H7 | 108.2 | C4—N3—C6 | 122.96 (15) |
C1—C7—H7 | 108.2 | C7—N3—C6 | 112.47 (13) |
O4—C8—C9 | 116.82 (15) | ||
C14—C1—C2—C3 | 175.22 (15) | C2—C1—C14—C13 | −156.47 (16) |
C7—C1—C2—C3 | −2.0 (3) | C7—C1—C14—C13 | 20.9 (2) |
C1—C2—C3—N1 | −176.57 (17) | C8—C13—C14—O3 | −165.56 (17) |
C1—C2—C3—C4 | −1.9 (2) | C12—C13—C14—O3 | 7.0 (3) |
N1—C3—C4—N2 | −1.9 (2) | C8—C13—C14—C1 | 9.7 (2) |
C2—C3—C4—N2 | −176.32 (15) | C12—C13—C14—C1 | −177.78 (15) |
N1—C3—C4—N3 | 178.45 (15) | C9—C8—O4—C7 | 157.13 (15) |
C2—C3—C4—N3 | 4.0 (2) | C13—C8—O4—C7 | −25.6 (2) |
C2—C1—C7—N3 | 3.6 (2) | N3—C7—O4—C8 | −179.19 (12) |
C14—C1—C7—N3 | −173.86 (14) | C1—C7—O4—C8 | 55.05 (17) |
C2—C1—C7—O4 | 124.28 (17) | C2—C3—N1—O2 | 1.8 (3) |
C14—C1—C7—O4 | −53.19 (18) | C4—C3—N1—O2 | −172.78 (17) |
O4—C8—C9—C10 | −179.54 (16) | C2—C3—N1—O1 | −179.23 (17) |
C13—C8—C9—C10 | 3.2 (2) | C4—C3—N1—O1 | 6.2 (3) |
C8—C9—C10—C11 | −0.2 (3) | N3—C4—N2—C5 | −14.2 (3) |
C9—C10—C11—C12 | −2.6 (3) | C3—C4—N2—C5 | 166.2 (2) |
C10—C11—C12—C13 | 2.5 (3) | N2—C4—N3—C7 | 178.08 (15) |
O4—C8—C13—C12 | 179.59 (16) | C3—C4—N3—C7 | −2.3 (2) |
C9—C8—C13—C12 | −3.3 (2) | N2—C4—N3—C6 | −9.7 (2) |
O4—C8—C13—C14 | −7.7 (2) | C3—C4—N3—C6 | 169.90 (16) |
C9—C8—C13—C14 | 169.44 (16) | O4—C7—N3—C4 | −124.20 (15) |
C11—C12—C13—C8 | 0.4 (3) | C1—C7—N3—C4 | −1.4 (2) |
C11—C12—C13—C14 | −172.27 (16) | O4—C7—N3—C6 | 62.89 (17) |
C2—C1—C14—O3 | 18.8 (3) | C1—C7—N3—C6 | −174.29 (15) |
C7—C1—C14—O3 | −163.82 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2A···O1 | 0.86 | 1.83 | 2.543 (2) | 139 |
C5—H5A···O2i | 0.96 | 2.46 | 3.376 (3) | 159 |
C5—H5C···O3ii | 0.96 | 2.51 | 3.416 (3) | 157 |
C6—H6A···O3ii | 0.96 | 2.55 | 3.429 (2) | 152 |
C9—H9···O3i | 0.93 | 2.60 | 3.455 (2) | 154 |
Symmetry codes: (i) x, y, z−1; (ii) x+1/4, −y+1/4, z−3/4. |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2A···O1 | 0.86 | 1.83 | 2.543 (2) | 139 |
C5—H5A···O2i | 0.96 | 2.46 | 3.376 (3) | 159 |
C5—H5C···O3ii | 0.96 | 2.51 | 3.416 (3) | 157 |
C6—H6A···O3ii | 0.96 | 2.55 | 3.429 (2) | 152 |
C9—H9···O3i | 0.93 | 2.60 | 3.455 (2) | 154 |
Symmetry codes: (i) x, y, z−1; (ii) x+1/4, −y+1/4, z−3/4. |
Acknowledgements
The authors thank Department of Chemistry, IIT, Chennai, India, for
data collection.References
Bruker (2008). APEX2, SADABS and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Ercole, F., Davis, T. P. & Evans, R. A. (2009). Macromolecules, 42, 1500–1511. Web of Science CrossRef CAS Google Scholar
Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849–854. Web of Science CrossRef CAS IUCr Journals Google Scholar
Geen, G. R., Evans, J. M. & Vong, A. K. (1996). Comprehensive Heterocyclic Chemistry, 1st ed., edited by A. R. Katrizky, Vol. 3, pp. 469–500. New York: Pergamon. Google Scholar
Khan, K. M., Ambreen, N., Mughal, U. R., Jalil, S., Perveen, S. & Choudhary, M. I. (2010). Eur. J. Med. Chem. 45, 4058–4064. Web of Science CrossRef CAS PubMed Google Scholar
Raj, T., Bhatia, R. K., kapur, A., Sharma, M., Saxena, A. K. & Ishar, M. P. S. (2010). Eur. J. Med. Chem. 45, 790–794. Web of Science CrossRef PubMed CAS Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Spek, A. L. (2009). Acta Cryst. D65, 148–155. Web of Science CrossRef CAS IUCr Journals Google Scholar
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Chromene derivatives are very important heterocyclic compounds that have a variety of industrial, biological and chemical synthesis applications (Geen et al., 1996; Ercole et al., 2009). They exhibit a number of pharmacological activities such as anti-HIV, anti-inflammatory, anti-bacterial, anti-allergic, anti-cancer etc. (Khan et al., 2010; Raj et al., 2010). Against this backround, X-ray analysis of the title compound has been carried out to study its structural aspects.
The molecular structure of the title molecule is shown in Fig. 1. The pyran ring (C1-C7-O4-C8-C13-C14) adopts a envelope conformation with the deviation of atoms O4 and C14 from the mean plane through atoms (C1-C7-C8-C13) being 0.475 and -0.095Å, respectively. The smallest displacement asymmetry parameters q2 and q3 are 0.421 (17) and -0.219 (17)Å. The ring parameters Q and phase angle θ are 0.475 (16)Å and 117.5 (2)°, respectively. The dihedral angle between the mean planes of the chromeno ring system (fusion of benzene and pyran rings) and the pyridine ring is 29.37 (7)°. The pyridine ring mean planes forms a dihedral angle of 31.22 (8)° with phenyl ring (C8-C13). The atoms O3 deviates by -0.295Å from the chromeno ring mean plane (O4/C1-C7).
An intramolecular N—H···O and N—H···N interaction occurs. In the crystal, molecules are linked by C—H···O hydrogen bonds, forming inversion dimers with an R22(8) ring motif. The molecules are linked via C—H···O hydrogen bonds, forming ribbons along [110] dirction. There are a number of π—π interactions present linking the ribbons and forming a three dimensional structure [ Cg2-Cg3i =3.6529 (10)Å, Cg2-Cg3ii = 3.6871 (10)Å and Cg3-Cg2iii = 3.6528 (10)Å; where Cg2 and Cg3 are the centroids of the N3/C4/C3/C2/C1/C7 and C8/C13 rings, respectively; symmetry codes: (i) -x,-y,-z; (ii) 1/4+x,1/4-y, 1/4+z; (iii) -1/4+x,1/4-y,-1/4+z].