organic compounds
Diethyl 2,6-dimethyl-4-[5-(4-methylphenyl)-1H-pyrazol-4-yl]-1,4-dihydropyridine-3,5-dicarboxylate
aNational Institute of Technology-Karnataka, Department of Chemistry, Medicinal Chemistry Laboratory, Surathkal, Mangalore 575 025, India, bKuvempu University, Department of P.G. Studies and Research in Biotechnology and Bioinformatics, Jnanasahyadri–Karnataka, Shankaraghatta 577 451, India, and cNelson Mandela Metropolitan University, Summerstrand Campus, Department of Chemistry, University Way, Summerstrand, PO Box 77000, Port Elizabeth, 6031, South Africa
*Correspondence e-mail: richard.betz@webmail.co.za
In the title compound, C23H27N3O4, the dihydropyridine ring adopts a 1,4B conformation. Intramolecular C—H⋯O contacts occur. In the crystal, N—H⋯O and N—H⋯N hydrogen bonds and C—H⋯N contacts connect the molecules into strands along the a-axis direction.
Related literature
For background to the biological and pharmaceutical importance of dihydropyridine compounds, see: Stout & Meyers (1982); Vijesh et al. (2011); Boecker & Guengerich (1986); Vo et al. (1995). For puckering analysis, see: Cremer & Pople (1975); Boeyens (1978). For graph-set analysis of hydrogen bonds, see: Etter et al. (1990); Bernstein et al. (1995).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2010); cell SAINT (Bruker, 2010); 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 (Farrugia, 2012) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supporting information
10.1107/S1600536812044649/hg5264sup1.cif
contains datablocks I, global. DOI:Supporting information file. DOI: 10.1107/S1600536812044649/hg5264Isup2.cdx
Structure factors: contains datablock I. DOI: 10.1107/S1600536812044649/hg5264Isup3.hkl
Supporting information file. DOI: 10.1107/S1600536812044649/hg5264Isup4.cml
3-(4-methylphenyl)-1H-pyrazole-4-carbaldehyde(0.187 g, 1.0 mmol), ethylacetoacetate (0.26 g, 2.0 mmol) and ammonium acetate (0.092 g, 1.2 mmol) in ethanol (7 ml) were refluxed in an oil bath for 5 h. After completion of the reaction, the mixture was concentrated and poured into crushed ice. The precipitated product was filtered and washed with water. The resulting solid was recrystallized from ethanol:water (v:v = 1:1), yield: 0.33 g (80.68%).
Carbon-bound H atoms were placed in calculated positions (C–H 0.95 Å for aromatic carbon atoms, C–H 0.99 Å for methylene groups and C–H 1.00 Å for the methine group) and were included in the
in the riding model approximation, with U(H) set to 1.2Ueq(C). The H atoms of the methyl groups were allowed to rotate with a fixed angle around the C–C bond to best fit the experimental electron density (HFIX 137 in the SHELX program suite (Sheldrick, 2008), with U(H) set to 1.5Ueq(C). Both nitrogen-bound H atoms were located on a difference Fourier map and refined freely.Data collection: APEX2 (Bruker, 2010); cell
SAINT (Bruker, 2010); data reduction: SAINT (Bruker, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 2012) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).C23H27N3O4 | Z = 2 |
Mr = 409.48 | F(000) = 436 |
Triclinic, P1 | Dx = 1.301 Mg m−3 |
Hall symbol: -P 1 | Melting point = 471–473 K |
a = 8.5905 (2) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 10.8253 (3) Å | Cell parameters from 9960 reflections |
c = 11.3702 (3) Å | θ = 2.7–28.3° |
α = 91.021 (1)° | µ = 0.09 mm−1 |
β = 97.922 (1)° | T = 200 K |
γ = 93.445 (1)° | Block, yellow |
V = 1045.02 (5) Å3 | 0.36 × 0.31 × 0.16 mm |
Bruker APEXII CCD diffractometer | 4983 independent reflections |
Radiation source: fine-focus sealed tube | 4313 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.017 |
ϕ and ω scans | θmax = 28.0°, θmin = 2.4° |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | h = −11→11 |
Tmin = 0.969, Tmax = 0.986 | k = −14→14 |
18073 measured reflections | l = −15→14 |
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)] = 0.041 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.113 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0515P)2 + 0.4147P] where P = (Fo2 + 2Fc2)/3 |
4983 reflections | (Δ/σ)max < 0.001 |
284 parameters | Δρmax = 0.33 e Å−3 |
0 restraints | Δρmin = −0.21 e Å−3 |
C23H27N3O4 | γ = 93.445 (1)° |
Mr = 409.48 | V = 1045.02 (5) Å3 |
Triclinic, P1 | Z = 2 |
a = 8.5905 (2) Å | Mo Kα radiation |
b = 10.8253 (3) Å | µ = 0.09 mm−1 |
c = 11.3702 (3) Å | T = 200 K |
α = 91.021 (1)° | 0.36 × 0.31 × 0.16 mm |
β = 97.922 (1)° |
Bruker APEXII CCD diffractometer | 4983 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | 4313 reflections with I > 2σ(I) |
Tmin = 0.969, Tmax = 0.986 | Rint = 0.017 |
18073 measured reflections |
R[F2 > 2σ(F2)] = 0.041 | 0 restraints |
wR(F2) = 0.113 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | Δρmax = 0.33 e Å−3 |
4983 reflections | Δρmin = −0.21 e Å−3 |
284 parameters |
x | y | z | Uiso*/Ueq | ||
O1 | 0.45908 (13) | 0.00208 (9) | 0.66938 (10) | 0.0463 (3) | |
O2 | 0.25873 (11) | −0.00254 (8) | 0.52185 (9) | 0.0327 (2) | |
O3 | 0.15357 (10) | 0.44024 (9) | 0.88752 (8) | 0.0317 (2) | |
O4 | 0.37379 (10) | 0.34282 (9) | 0.94459 (8) | 0.0304 (2) | |
N11 | 0.25151 (12) | 0.37638 (9) | 0.53483 (9) | 0.0245 (2) | |
H11B | 0.2162 (19) | 0.4218 (15) | 0.4735 (15) | 0.034 (4)* | |
N21 | 0.76600 (12) | 0.46269 (10) | 0.68190 (10) | 0.0280 (2) | |
N22 | 0.82226 (12) | 0.39623 (9) | 0.77631 (9) | 0.0242 (2) | |
H22 | 0.923 (2) | 0.4087 (15) | 0.8088 (14) | 0.033 (4)* | |
C1 | 0.24030 (17) | 0.21083 (13) | 0.38718 (11) | 0.0343 (3) | |
H1A | 0.1319 | 0.1744 | 0.3764 | 0.051* | |
H1B | 0.3115 | 0.1484 | 0.3679 | 0.051* | |
H1C | 0.2478 | 0.2810 | 0.3345 | 0.051* | |
C2 | 0.15003 (15) | 0.53629 (12) | 0.64804 (12) | 0.0297 (3) | |
H2A | 0.1726 | 0.5759 | 0.7273 | 0.045* | |
H2B | 0.0363 | 0.5174 | 0.6282 | 0.045* | |
H2C | 0.1865 | 0.5924 | 0.5894 | 0.045* | |
C3 | 0.36694 (14) | 0.05624 (11) | 0.60280 (11) | 0.0266 (2) | |
C4 | 0.25461 (18) | −0.13674 (12) | 0.51954 (14) | 0.0362 (3) | |
H4A | 0.2425 | −0.1689 | 0.5990 | 0.043* | |
H4B | 0.3530 | −0.1658 | 0.4957 | 0.043* | |
C5 | 0.11687 (18) | −0.17966 (13) | 0.43120 (14) | 0.0403 (3) | |
H5A | 0.0216 | −0.1448 | 0.4528 | 0.060* | |
H5B | 0.1041 | −0.2702 | 0.4305 | 0.060* | |
H5C | 0.1342 | −0.1521 | 0.3521 | 0.060* | |
C6 | 0.26466 (13) | 0.38529 (11) | 0.86200 (11) | 0.0237 (2) | |
C7 | 0.35707 (17) | 0.36804 (16) | 1.06793 (12) | 0.0378 (3) | |
H7A | 0.2562 | 0.3296 | 1.0866 | 0.045* | |
H7B | 0.3589 | 0.4584 | 1.0837 | 0.045* | |
C8 | 0.49288 (19) | 0.31395 (17) | 1.14178 (13) | 0.0443 (4) | |
H8A | 0.4903 | 0.3340 | 1.2258 | 0.066* | |
H8B | 0.5918 | 0.3486 | 1.1184 | 0.066* | |
H8C | 0.4855 | 0.2238 | 1.1294 | 0.066* | |
C9 | 0.90941 (19) | −0.02184 (15) | 1.18484 (14) | 0.0431 (4) | |
H9A | 0.8981 | 0.0137 | 1.2629 | 0.065* | |
H9B | 1.0204 | −0.0360 | 1.1817 | 0.065* | |
H9C | 0.8465 | −0.1007 | 1.1719 | 0.065* | |
C11 | 0.41373 (12) | 0.25920 (10) | 0.72388 (10) | 0.0203 (2) | |
H11 | 0.4153 | 0.1989 | 0.7895 | 0.024* | |
C12 | 0.35319 (13) | 0.19111 (11) | 0.60642 (10) | 0.0226 (2) | |
C13 | 0.28586 (14) | 0.25489 (11) | 0.51391 (11) | 0.0244 (2) | |
C14 | 0.23363 (13) | 0.41889 (11) | 0.64688 (11) | 0.0228 (2) | |
C15 | 0.29660 (13) | 0.35556 (10) | 0.74185 (10) | 0.0210 (2) | |
C21 | 0.57727 (13) | 0.32159 (10) | 0.72757 (10) | 0.0211 (2) | |
C22 | 0.61806 (14) | 0.41725 (12) | 0.65375 (11) | 0.0265 (3) | |
H22A | 0.5473 | 0.4465 | 0.5902 | 0.032* | |
C23 | 0.71422 (13) | 0.31013 (10) | 0.80674 (10) | 0.0214 (2) | |
C31 | 0.75666 (13) | 0.22762 (11) | 0.90584 (10) | 0.0231 (2) | |
C32 | 0.86603 (15) | 0.26894 (12) | 1.00279 (11) | 0.0282 (3) | |
H32 | 0.9084 | 0.3523 | 1.0074 | 0.034* | |
C33 | 0.91302 (16) | 0.18844 (13) | 1.09262 (12) | 0.0327 (3) | |
H33 | 0.9883 | 0.2177 | 1.1578 | 0.039* | |
C34 | 0.85291 (15) | 0.06632 (13) | 1.08966 (12) | 0.0321 (3) | |
C35 | 0.74117 (17) | 0.02728 (13) | 0.99461 (13) | 0.0357 (3) | |
H35 | 0.6959 | −0.0551 | 0.9921 | 0.043* | |
C36 | 0.69364 (15) | 0.10560 (12) | 0.90293 (12) | 0.0311 (3) | |
H36 | 0.6180 | 0.0760 | 0.8381 | 0.037* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0470 (6) | 0.0281 (5) | 0.0564 (7) | 0.0101 (4) | −0.0218 (5) | −0.0044 (5) |
O2 | 0.0351 (5) | 0.0228 (4) | 0.0369 (5) | 0.0006 (4) | −0.0064 (4) | −0.0024 (4) |
O3 | 0.0226 (4) | 0.0383 (5) | 0.0348 (5) | 0.0059 (4) | 0.0047 (4) | −0.0034 (4) |
O4 | 0.0269 (4) | 0.0430 (5) | 0.0215 (4) | 0.0090 (4) | 0.0015 (3) | −0.0001 (4) |
N11 | 0.0230 (5) | 0.0253 (5) | 0.0242 (5) | 0.0011 (4) | −0.0010 (4) | 0.0067 (4) |
N21 | 0.0209 (5) | 0.0310 (5) | 0.0316 (5) | 0.0012 (4) | 0.0004 (4) | 0.0109 (4) |
N22 | 0.0178 (5) | 0.0265 (5) | 0.0273 (5) | 0.0015 (4) | −0.0012 (4) | 0.0056 (4) |
C1 | 0.0409 (7) | 0.0360 (7) | 0.0239 (6) | −0.0007 (6) | −0.0016 (5) | 0.0017 (5) |
C2 | 0.0244 (6) | 0.0273 (6) | 0.0373 (7) | 0.0063 (5) | 0.0012 (5) | 0.0064 (5) |
C3 | 0.0243 (6) | 0.0256 (6) | 0.0292 (6) | 0.0018 (4) | 0.0018 (5) | −0.0019 (5) |
C4 | 0.0398 (7) | 0.0222 (6) | 0.0439 (8) | 0.0016 (5) | −0.0033 (6) | −0.0025 (5) |
C5 | 0.0424 (8) | 0.0287 (7) | 0.0462 (8) | −0.0004 (6) | −0.0042 (6) | −0.0033 (6) |
C6 | 0.0189 (5) | 0.0236 (5) | 0.0277 (6) | −0.0015 (4) | 0.0016 (4) | 0.0002 (4) |
C7 | 0.0341 (7) | 0.0567 (9) | 0.0229 (6) | 0.0055 (6) | 0.0049 (5) | −0.0031 (6) |
C8 | 0.0413 (8) | 0.0642 (10) | 0.0255 (7) | 0.0036 (7) | −0.0025 (6) | 0.0007 (6) |
C9 | 0.0408 (8) | 0.0478 (9) | 0.0400 (8) | 0.0045 (7) | 0.0001 (6) | 0.0213 (7) |
C11 | 0.0176 (5) | 0.0212 (5) | 0.0216 (5) | 0.0016 (4) | 0.0004 (4) | 0.0029 (4) |
C12 | 0.0199 (5) | 0.0229 (5) | 0.0245 (5) | −0.0003 (4) | 0.0022 (4) | 0.0000 (4) |
C13 | 0.0209 (5) | 0.0265 (6) | 0.0248 (6) | −0.0025 (4) | 0.0013 (4) | 0.0012 (4) |
C14 | 0.0158 (5) | 0.0230 (5) | 0.0287 (6) | −0.0008 (4) | 0.0010 (4) | 0.0031 (4) |
C15 | 0.0164 (5) | 0.0212 (5) | 0.0251 (5) | 0.0002 (4) | 0.0016 (4) | 0.0017 (4) |
C21 | 0.0182 (5) | 0.0224 (5) | 0.0223 (5) | 0.0031 (4) | 0.0007 (4) | 0.0019 (4) |
C22 | 0.0195 (5) | 0.0304 (6) | 0.0287 (6) | 0.0020 (4) | −0.0006 (4) | 0.0089 (5) |
C23 | 0.0188 (5) | 0.0221 (5) | 0.0229 (5) | 0.0031 (4) | 0.0012 (4) | 0.0009 (4) |
C31 | 0.0195 (5) | 0.0258 (6) | 0.0239 (5) | 0.0046 (4) | 0.0011 (4) | 0.0033 (4) |
C32 | 0.0265 (6) | 0.0293 (6) | 0.0272 (6) | −0.0008 (5) | −0.0008 (5) | 0.0033 (5) |
C33 | 0.0287 (6) | 0.0409 (7) | 0.0262 (6) | 0.0007 (5) | −0.0047 (5) | 0.0060 (5) |
C34 | 0.0272 (6) | 0.0384 (7) | 0.0311 (6) | 0.0052 (5) | 0.0023 (5) | 0.0127 (5) |
C35 | 0.0344 (7) | 0.0284 (6) | 0.0419 (8) | −0.0012 (5) | −0.0030 (6) | 0.0101 (6) |
C36 | 0.0275 (6) | 0.0286 (6) | 0.0339 (7) | 0.0007 (5) | −0.0070 (5) | 0.0045 (5) |
O1—C3 | 1.2041 (16) | C7—H7A | 0.9900 |
O2—C3 | 1.3373 (15) | C7—H7B | 0.9900 |
O2—C4 | 1.4508 (15) | C8—H8A | 0.9800 |
O3—C6 | 1.2195 (15) | C8—H8B | 0.9800 |
O4—C6 | 1.3403 (14) | C8—H8C | 0.9800 |
O4—C7 | 1.4521 (15) | C9—C34 | 1.5050 (18) |
N11—C14 | 1.3785 (16) | C9—H9A | 0.9800 |
N11—C13 | 1.3886 (16) | C9—H9B | 0.9800 |
N11—H11B | 0.890 (17) | C9—H9C | 0.9800 |
N21—C22 | 1.3292 (15) | C11—C21 | 1.5167 (15) |
N21—N22 | 1.3527 (14) | C11—C15 | 1.5223 (15) |
N22—C23 | 1.3586 (15) | C11—C12 | 1.5247 (15) |
N22—H22 | 0.892 (17) | C11—H11 | 1.0000 |
C1—C13 | 1.5015 (17) | C12—C13 | 1.3505 (16) |
C1—H1A | 0.9800 | C14—C15 | 1.3559 (16) |
C1—H1B | 0.9800 | C21—C23 | 1.3926 (15) |
C1—H1C | 0.9800 | C21—C22 | 1.4029 (16) |
C2—C14 | 1.4977 (16) | C22—H22A | 0.9500 |
C2—H2A | 0.9800 | C23—C31 | 1.4704 (15) |
C2—H2B | 0.9800 | C31—C32 | 1.3945 (17) |
C2—H2C | 0.9800 | C31—C36 | 1.3952 (17) |
C3—C12 | 1.4720 (16) | C32—C33 | 1.3877 (17) |
C4—C5 | 1.488 (2) | C32—H32 | 0.9500 |
C4—H4A | 0.9900 | C33—C34 | 1.388 (2) |
C4—H4B | 0.9900 | C33—H33 | 0.9500 |
C5—H5A | 0.9800 | C34—C35 | 1.3845 (19) |
C5—H5B | 0.9800 | C35—C36 | 1.3885 (18) |
C5—H5C | 0.9800 | C35—H35 | 0.9500 |
C6—C15 | 1.4641 (16) | C36—H36 | 0.9500 |
C7—C8 | 1.496 (2) | ||
C3—O2—C4 | 116.55 (10) | C34—C9—H9A | 109.5 |
C6—O4—C7 | 116.94 (10) | C34—C9—H9B | 109.5 |
C14—N11—C13 | 121.46 (10) | H9A—C9—H9B | 109.5 |
C14—N11—H11B | 117.7 (10) | C34—C9—H9C | 109.5 |
C13—N11—H11B | 119.0 (10) | H9A—C9—H9C | 109.5 |
C22—N21—N22 | 103.83 (9) | H9B—C9—H9C | 109.5 |
N21—N22—C23 | 112.96 (10) | C21—C11—C15 | 109.87 (9) |
N21—N22—H22 | 119.8 (10) | C21—C11—C12 | 113.53 (9) |
C23—N22—H22 | 127.1 (10) | C15—C11—C12 | 106.87 (9) |
C13—C1—H1A | 109.5 | C21—C11—H11 | 108.8 |
C13—C1—H1B | 109.5 | C15—C11—H11 | 108.8 |
H1A—C1—H1B | 109.5 | C12—C11—H11 | 108.8 |
C13—C1—H1C | 109.5 | C13—C12—C3 | 123.65 (11) |
H1A—C1—H1C | 109.5 | C13—C12—C11 | 119.48 (10) |
H1B—C1—H1C | 109.5 | C3—C12—C11 | 116.82 (10) |
C14—C2—H2A | 109.5 | C12—C13—N11 | 118.14 (11) |
C14—C2—H2B | 109.5 | C12—C13—C1 | 128.04 (11) |
H2A—C2—H2B | 109.5 | N11—C13—C1 | 113.82 (11) |
C14—C2—H2C | 109.5 | C15—C14—N11 | 118.45 (10) |
H2A—C2—H2C | 109.5 | C15—C14—C2 | 127.45 (11) |
H2B—C2—H2C | 109.5 | N11—C14—C2 | 114.04 (10) |
O1—C3—O2 | 122.52 (11) | C14—C15—C6 | 121.38 (10) |
O1—C3—C12 | 124.48 (11) | C14—C15—C11 | 118.89 (10) |
O2—C3—C12 | 112.88 (10) | C6—C15—C11 | 119.52 (10) |
O2—C4—C5 | 106.23 (11) | C23—C21—C22 | 103.87 (10) |
O2—C4—H4A | 110.5 | C23—C21—C11 | 130.71 (10) |
C5—C4—H4A | 110.5 | C22—C21—C11 | 125.13 (10) |
O2—C4—H4B | 110.5 | N21—C22—C21 | 113.03 (10) |
C5—C4—H4B | 110.5 | N21—C22—H22A | 123.5 |
H4A—C4—H4B | 108.7 | C21—C22—H22A | 123.5 |
C4—C5—H5A | 109.5 | N22—C23—C21 | 106.30 (10) |
C4—C5—H5B | 109.5 | N22—C23—C31 | 120.22 (10) |
H5A—C5—H5B | 109.5 | C21—C23—C31 | 133.47 (11) |
C4—C5—H5C | 109.5 | C32—C31—C36 | 118.69 (11) |
H5A—C5—H5C | 109.5 | C32—C31—C23 | 120.25 (11) |
H5B—C5—H5C | 109.5 | C36—C31—C23 | 121.01 (11) |
O3—C6—O4 | 122.45 (11) | C33—C32—C31 | 120.06 (12) |
O3—C6—C15 | 126.12 (11) | C33—C32—H32 | 120.0 |
O4—C6—C15 | 111.42 (10) | C31—C32—H32 | 120.0 |
O4—C7—C8 | 106.79 (11) | C32—C33—C34 | 121.70 (12) |
O4—C7—H7A | 110.4 | C32—C33—H33 | 119.2 |
C8—C7—H7A | 110.4 | C34—C33—H33 | 119.2 |
O4—C7—H7B | 110.4 | C35—C34—C33 | 117.73 (12) |
C8—C7—H7B | 110.4 | C35—C34—C9 | 120.89 (13) |
H7A—C7—H7B | 108.6 | C33—C34—C9 | 121.37 (13) |
C7—C8—H8A | 109.5 | C34—C35—C36 | 121.64 (13) |
C7—C8—H8B | 109.5 | C34—C35—H35 | 119.2 |
H8A—C8—H8B | 109.5 | C36—C35—H35 | 119.2 |
C7—C8—H8C | 109.5 | C35—C36—C31 | 120.15 (12) |
H8A—C8—H8C | 109.5 | C35—C36—H36 | 119.9 |
H8B—C8—H8C | 109.5 | C31—C36—H36 | 119.9 |
C22—N21—N22—C23 | 0.64 (14) | C21—C11—C15—C14 | 83.76 (12) |
C4—O2—C3—O1 | 1.44 (19) | C12—C11—C15—C14 | −39.82 (13) |
C4—O2—C3—C12 | −174.64 (11) | C21—C11—C15—C6 | −91.09 (12) |
C3—O2—C4—C5 | 174.86 (12) | C12—C11—C15—C6 | 145.33 (10) |
C7—O4—C6—O3 | −1.67 (18) | C15—C11—C21—C23 | 116.11 (13) |
C7—O4—C6—C15 | 179.04 (11) | C12—C11—C21—C23 | −124.30 (13) |
C6—O4—C7—C8 | −179.02 (12) | C15—C11—C21—C22 | −56.77 (15) |
O1—C3—C12—C13 | 159.81 (14) | C12—C11—C21—C22 | 62.82 (15) |
O2—C3—C12—C13 | −24.20 (17) | N22—N21—C22—C21 | −0.49 (14) |
O1—C3—C12—C11 | −22.62 (18) | C23—C21—C22—N21 | 0.18 (14) |
O2—C3—C12—C11 | 153.37 (10) | C11—C21—C22—N21 | 174.63 (11) |
C21—C11—C12—C13 | −83.11 (13) | N21—N22—C23—C21 | −0.54 (14) |
C15—C11—C12—C13 | 38.18 (14) | N21—N22—C23—C31 | 178.60 (10) |
C21—C11—C12—C3 | 99.21 (12) | C22—C21—C23—N22 | 0.21 (13) |
C15—C11—C12—C3 | −139.50 (10) | C11—C21—C23—N22 | −173.80 (11) |
C3—C12—C13—N11 | 167.37 (11) | C22—C21—C23—C31 | −178.77 (12) |
C11—C12—C13—N11 | −10.14 (16) | C11—C21—C23—C31 | 7.2 (2) |
C3—C12—C13—C1 | −12.1 (2) | N22—C23—C31—C32 | 32.05 (17) |
C11—C12—C13—C1 | 170.34 (11) | C21—C23—C31—C32 | −149.08 (13) |
C14—N11—C13—C12 | −22.13 (16) | N22—C23—C31—C36 | −145.42 (12) |
C14—N11—C13—C1 | 157.45 (11) | C21—C23—C31—C36 | 33.4 (2) |
C13—N11—C14—C15 | 20.38 (16) | C36—C31—C32—C33 | 1.51 (19) |
C13—N11—C14—C2 | −162.15 (10) | C23—C31—C32—C33 | −176.02 (11) |
N11—C14—C15—C6 | −171.78 (10) | C31—C32—C33—C34 | −0.5 (2) |
C2—C14—C15—C6 | 11.14 (18) | C32—C33—C34—C35 | −1.2 (2) |
N11—C14—C15—C11 | 13.47 (15) | C32—C33—C34—C9 | 177.43 (13) |
C2—C14—C15—C11 | −163.61 (11) | C33—C34—C35—C36 | 2.0 (2) |
O3—C6—C15—C14 | 21.00 (18) | C9—C34—C35—C36 | −176.65 (14) |
O4—C6—C15—C14 | −159.74 (11) | C34—C35—C36—C31 | −1.1 (2) |
O3—C6—C15—C11 | −164.28 (11) | C32—C31—C36—C35 | −0.75 (19) |
O4—C6—C15—C11 | 14.98 (14) | C23—C31—C36—C35 | 176.77 (12) |
D—H···A | D—H | H···A | D···A | D—H···A |
N11—H11B···N21i | 0.890 (17) | 2.200 (17) | 3.0352 (14) | 156.2 (14) |
N22—H22···O3ii | 0.892 (17) | 2.066 (17) | 2.9580 (13) | 178.6 (15) |
C2—H2B···N21iii | 0.98 | 2.52 | 3.4223 (16) | 153 |
C36—H36···O1 | 0.95 | 2.30 | 3.2428 (17) | 173 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x+1, y, z; (iii) x−1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C23H27N3O4 |
Mr | 409.48 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 200 |
a, b, c (Å) | 8.5905 (2), 10.8253 (3), 11.3702 (3) |
α, β, γ (°) | 91.021 (1), 97.922 (1), 93.445 (1) |
V (Å3) | 1045.02 (5) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.36 × 0.31 × 0.16 |
Data collection | |
Diffractometer | Bruker APEXII CCD diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2008) |
Tmin, Tmax | 0.969, 0.986 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 18073, 4983, 4313 |
Rint | 0.017 |
(sin θ/λ)max (Å−1) | 0.661 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.041, 0.113, 1.05 |
No. of reflections | 4983 |
No. of parameters | 284 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.33, −0.21 |
Computer programs: APEX2 (Bruker, 2010), SAINT (Bruker, 2010), SHELXS97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 2012) and Mercury (Macrae et al., 2008), SHELXL97 (Sheldrick, 2008) and PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N11—H11B···N21i | 0.890 (17) | 2.200 (17) | 3.0352 (14) | 156.2 (14) |
N22—H22···O3ii | 0.892 (17) | 2.066 (17) | 2.9580 (13) | 178.6 (15) |
C2—H2B···N21iii | 0.98 | 2.52 | 3.4223 (16) | 152.8 |
C36—H36···O1 | 0.95 | 2.30 | 3.2428 (17) | 173.4 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x+1, y, z; (iii) x−1, y, z. |
Acknowledgements
AMI is thankful to the Board of Research in Nuclear Sciences, Government of India for the Young Scientist award and also thanks the Vision Group on Science & Technology, Government of Karnataka, India for the Best Research Paper award.
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.
The 1,4-dihydropyridine scaffold (DHP) represents a heterocyclic unit of remarkable pharmacological activity (Stout & Meyers, 1982) and is found to exhibit various biological activities (Vijesh et al., 2011). Several DHP-inspired compounds are already used clinically as calcium channel blockers for the treatment of cardiovascular diseases, such as Nifedipine and Nitrendipine – used for the treatment of hypertension and angina pectoris –, Nisoldipine – a potent vasodilator – and Nimodipine – selective agent for targeting cerebral vasculature – to name but a few (Boecker & Guengerich, 1986). A number of DHP derivatives are discussed as potential drugs for the treatment of congestive heart failure (Vo et al., 1995). Motivated by the promising pharmaceutical activities of 1,4-dihydropyridines, the title compound was synthesized to study its crystal structure.
The molecule is a pyrazole derivative featuring a phenyl as well as a dihydropyridine-derived substituent. While the small puckering amplitude precludes a conformational analysis of the five-membered heterocycle, the dihyropyridine ring adopts a 1,4B (N11,C11B) conformation (Cremer & Pople, 1975; Boeyens, 1978). The least-squares planes defined by the intracyclic atoms of the phenyl group as well as the five-membered heterocycle, respectively, enclose an angle of 33.03 (7) °. The plane defined by the atoms of the dihydropyridine core is almost planar (r.m.s. of all fitted atoms = 0.1726 Å), with the flap carbon atom and the nitrogen atom deviating most from the plane by 0.270 (1) Å and 0.199 (1) Å, respectively (Fig. 1).
In the crystal, classical intermolecular hydrogen bonds of the N–H···N as well as the N–H···O type are present. Furthermore, C–H···N contacts and C–H···O contacts whose range falls by more than 0.1 Å below the sum of van-der-Waals radii of the corresponding atoms are observed. The C–H···N contacts are supported by one of the hydrogen atoms of a methyl group directly bonded to the dihydropyridine ring and one of the nitrogen atoms of the pyrazole moiety. The intramolecular C–H···O contact is apparent between one of the hydrogen atoms of the phenyl group in ortho position to the pyrazole ring and one of the sp2 hybridized oxygen atoms. Metrical parameters as well as information about the symmetry of these contacts are summarized in Table 1. In total, the C–H···N contacts as well as the N–H···O-type hydrogen bonds form antidromic chains of molecules that are extended to strands along the crystallographic a axis by the N–H···N-type hydrogen bonds. In terms of graph-set analysis (Etter et al., 1990; Bernstein et al., 1995), the descriptor for the classical hydrogen bonds is C11(8)R22(16) on the unary level. The C–H supported contacts necessitate a S(9)C11(8) descriptor on the same level. The shortest intercentroid distance between two aromatic systems was measured at 4.7738 (8) Å (Fig. 2).
The packing of the title compound in the crystal structure is shown in Figure 3.