organic compounds
cis-1-(2-methyl-1,2,3,4-tetrahydroquinolin-4-yl)azepan-2-one
ofaDepartment of Chemistry, Kuvempu University, Jnanasahyadri, Shankaraghatta 577 451, India, bInstitution of Excellence, University of Mysore, Manasagangotri, Mysore 570 006, India, cDepartment of Chemistry, Yuvaraja's College, University of Mysore, Mysore 570 005, India, and dDepartment of Studies in Physics, University of Mysore, Manasagangotri, Mysore 570 006, India
*Correspondence e-mail: lokanath@physics.uni-mysore.ac.in
In the title compound, C16H22N2O, the azepan-2-one ring adopts a chair conformation, while the 1,2,3,4-tetrahydropyridine ring adopts a half-chair conformation. In the crystal, molecules are linked by N—H⋯O hydrogen bonds, forming supramolecular chains propagated along [10-1], with weak C—H⋯O interactions occurring between the chains.
Keywords: crystal structure; tetrahydroquinolines; azepan-2-one; hydrogen bonding.
CCDC reference: 1017682
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: APEX2 (Bruker, 2013); cell SAINT (Bruker, 2013); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: Mercury.
Supporting information
CCDC reference: 1017682
10.1107/S1600536814017826/xu5808sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536814017826/xu5808Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536814017826/xu5808Isup3.cml
A catalytic amount of SbF3 (10 mol %) was added to the mixture of aniline(1 equivalent) and N-vinyl caprolactam(2–3 equivalent) in acetonitrile (5–10 ml). The reaction mixture was stirred at ambient temperature (~25 °C) for 20–70 min. The reaction was monitored by TLC by using ethyl acetate/hexane as After the completion of the reaction, the solvent was removed under vacuo. The crude product was then quenched with water and the catalyst was decomposed by addition of appropriate amount of sodium bicarbonate solution, extracted with ethyl acetate (10 ml × 5 times), dried and was purified by using ethyl acetate/hexane as (pet ether/ethyl acetate 80:20 v/v). The white solid crystals were obtained by slow evaporation method by using petroleum ether: ethyl acetate, 8:2 v/v as solvents. M.P. = 155–160 °C. Yield: 93%.
The hydrogen atoms were placed geometrically with N—H = 0.86, C—H = 0.93–0.98 Å, and allowed to ride on their parent atoms with Uiso(H) = 1.5Ueq(C) for the methyl H atoms and 1.2Ueq(N,C) for the others.
Data collection: APEX2 (Bruker, 2013); cell
SAINT (Bruker, 2013); data reduction: SAINT (Bruker, 2013); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: Mercury (Macrae et al., 2008).C16H22N2O | F(000) = 560 |
Mr = 258.36 | Dx = 1.195 Mg m−3 |
Monoclinic, P21/n | Cu Kα radiation, λ = 1.54178 Å |
Hall symbol: -P 2yn | Cell parameters from 2343 reflections |
a = 9.1640 (17) Å | θ = 6.7–64.8° |
b = 13.1687 (18) Å | µ = 0.59 mm−1 |
c = 11.988 (2) Å | T = 296 K |
β = 96.825 (11)° | Block, colorless |
V = 1436.4 (4) Å3 | 0.23 × 0.22 × 0.21 mm |
Z = 4 |
Bruker X8 Proteum diffractometer | 2343 independent reflections |
Radiation source: Bruker MicroStar microfocus rotating anode | 2106 reflections with I > 2σ(I) |
Helios multilayer optics monochromator | Rint = 0.028 |
Detector resolution: 18.4 pixels mm-1 | θmax = 64.8°, θmin = 6.7° |
ϕ and ω scans | h = −10→10 |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | k = −15→4 |
Tmin = 0.874, Tmax = 0.884 | l = −14→13 |
7903 measured reflections |
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)] = 0.049 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.139 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0671P)2 + 0.4283P] where P = (Fo2 + 2Fc2)/3 |
2343 reflections | (Δ/σ)max < 0.001 |
173 parameters | Δρmax = 0.34 e Å−3 |
0 restraints | Δρmin = −0.36 e Å−3 |
C16H22N2O | V = 1436.4 (4) Å3 |
Mr = 258.36 | Z = 4 |
Monoclinic, P21/n | Cu Kα radiation |
a = 9.1640 (17) Å | µ = 0.59 mm−1 |
b = 13.1687 (18) Å | T = 296 K |
c = 11.988 (2) Å | 0.23 × 0.22 × 0.21 mm |
β = 96.825 (11)° |
Bruker X8 Proteum diffractometer | 2343 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | 2106 reflections with I > 2σ(I) |
Tmin = 0.874, Tmax = 0.884 | Rint = 0.028 |
7903 measured reflections |
R[F2 > 2σ(F2)] = 0.049 | 0 restraints |
wR(F2) = 0.139 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.34 e Å−3 |
2343 reflections | Δρmin = −0.36 e Å−3 |
173 parameters |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
Refinement. Refinement on F2 for ALL reflections except those flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The observed criterion of F2 > σ(F2) is used only for calculating -R-factor-obs 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 | ||
O19 | 0.20029 (15) | 0.75502 (10) | 0.32245 (11) | 0.0661 (5) | |
N1 | 0.53573 (16) | 0.85016 (11) | −0.01036 (12) | 0.0538 (5) | |
N12 | 0.28345 (14) | 0.90157 (10) | 0.25474 (10) | 0.0438 (4) | |
C2 | 0.60480 (18) | 0.82217 (14) | 0.10008 (15) | 0.0511 (6) | |
C3 | 0.52791 (17) | 0.87701 (14) | 0.18769 (14) | 0.0497 (5) | |
C4 | 0.36664 (17) | 0.84597 (12) | 0.17675 (13) | 0.0421 (5) | |
C5 | 0.29631 (17) | 0.85491 (12) | 0.05626 (13) | 0.0439 (5) | |
C6 | 0.1450 (2) | 0.86076 (16) | 0.03030 (16) | 0.0593 (6) | |
C7 | 0.0790 (2) | 0.86425 (19) | −0.07861 (17) | 0.0718 (8) | |
C8 | 0.1649 (3) | 0.86264 (17) | −0.16454 (16) | 0.0700 (7) | |
C9 | 0.3153 (2) | 0.85678 (14) | −0.14226 (15) | 0.0605 (7) | |
C10 | 0.38380 (19) | 0.85289 (12) | −0.03180 (14) | 0.0459 (5) | |
C11 | 0.7676 (2) | 0.84612 (19) | 0.1097 (2) | 0.0743 (8) | |
C13 | 0.28372 (19) | 1.01269 (13) | 0.25122 (14) | 0.0514 (6) | |
C14 | 0.3621 (2) | 1.06237 (15) | 0.35552 (17) | 0.0640 (7) | |
C15 | 0.2718 (3) | 1.06735 (17) | 0.45383 (18) | 0.0770 (8) | |
C16 | 0.2169 (3) | 0.96542 (17) | 0.49058 (17) | 0.0720 (8) | |
C17 | 0.1190 (2) | 0.90829 (16) | 0.40028 (17) | 0.0627 (7) | |
C18 | 0.20364 (18) | 0.84820 (14) | 0.32180 (13) | 0.0486 (6) | |
H1 | 0.58880 | 0.86510 | −0.06260 | 0.0640* | |
H2 | 0.59290 | 0.74890 | 0.10990 | 0.0610* | |
H3A | 0.53550 | 0.94980 | 0.17750 | 0.0600* | |
H3B | 0.57490 | 0.86010 | 0.26220 | 0.0600* | |
H4 | 0.36380 | 0.77400 | 0.19710 | 0.0510* | |
H6 | 0.08640 | 0.86240 | 0.08850 | 0.0710* | |
H7 | −0.02280 | 0.86770 | −0.09380 | 0.0860* | |
H8 | 0.12120 | 0.86550 | −0.23860 | 0.0840* | |
H9 | 0.37220 | 0.85540 | −0.20150 | 0.0730* | |
H11A | 0.81160 | 0.80920 | 0.05330 | 0.1120* | |
H11B | 0.81330 | 0.82670 | 0.18280 | 0.1120* | |
H11C | 0.78080 | 0.91760 | 0.09920 | 0.1120* | |
H13A | 0.18280 | 1.03640 | 0.24060 | 0.0620* | |
H13B | 0.33020 | 1.03440 | 0.18670 | 0.0620* | |
H14A | 0.38960 | 1.13080 | 0.33670 | 0.0770* | |
H14B | 0.45190 | 1.02500 | 0.37870 | 0.0770* | |
H15A | 0.33110 | 1.09830 | 0.51720 | 0.0920* | |
H15B | 0.18770 | 1.11120 | 0.43340 | 0.0920* | |
H16A | 0.16270 | 0.97610 | 0.55430 | 0.0860* | |
H16B | 0.30120 | 0.92320 | 0.51580 | 0.0860* | |
H17A | 0.05640 | 0.86230 | 0.43620 | 0.0750* | |
H17B | 0.05600 | 0.95660 | 0.35650 | 0.0750* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O19 | 0.0806 (9) | 0.0577 (9) | 0.0692 (9) | −0.0120 (7) | 0.0477 (7) | −0.0006 (6) |
N1 | 0.0525 (8) | 0.0624 (9) | 0.0526 (8) | 0.0030 (7) | 0.0321 (7) | 0.0032 (7) |
N12 | 0.0447 (7) | 0.0501 (8) | 0.0406 (7) | 0.0023 (6) | 0.0221 (6) | 0.0023 (6) |
C2 | 0.0446 (9) | 0.0534 (10) | 0.0599 (10) | 0.0014 (7) | 0.0254 (8) | 0.0009 (8) |
C3 | 0.0411 (8) | 0.0607 (10) | 0.0501 (9) | −0.0022 (7) | 0.0173 (7) | −0.0045 (8) |
C4 | 0.0419 (8) | 0.0472 (9) | 0.0412 (8) | −0.0003 (7) | 0.0212 (6) | 0.0003 (7) |
C5 | 0.0441 (9) | 0.0469 (9) | 0.0436 (9) | −0.0039 (7) | 0.0179 (7) | −0.0008 (7) |
C6 | 0.0468 (10) | 0.0805 (13) | 0.0529 (10) | −0.0060 (9) | 0.0161 (8) | 0.0002 (9) |
C7 | 0.0567 (11) | 0.0964 (16) | 0.0609 (12) | −0.0073 (11) | 0.0017 (9) | 0.0001 (11) |
C8 | 0.0819 (14) | 0.0791 (14) | 0.0470 (10) | −0.0082 (11) | 0.0000 (10) | −0.0047 (9) |
C9 | 0.0812 (14) | 0.0618 (11) | 0.0424 (9) | −0.0068 (9) | 0.0238 (9) | −0.0057 (8) |
C10 | 0.0555 (9) | 0.0415 (9) | 0.0448 (9) | −0.0023 (7) | 0.0227 (7) | −0.0012 (7) |
C11 | 0.0451 (10) | 0.0932 (16) | 0.0900 (15) | 0.0016 (10) | 0.0301 (10) | −0.0044 (12) |
C13 | 0.0576 (10) | 0.0523 (10) | 0.0480 (9) | 0.0097 (8) | 0.0219 (8) | 0.0091 (7) |
C14 | 0.0803 (13) | 0.0496 (11) | 0.0641 (12) | 0.0029 (9) | 0.0170 (10) | −0.0019 (9) |
C15 | 0.1127 (18) | 0.0636 (13) | 0.0579 (12) | 0.0138 (12) | 0.0233 (12) | −0.0091 (10) |
C16 | 0.0985 (16) | 0.0738 (14) | 0.0498 (11) | 0.0185 (12) | 0.0348 (10) | −0.0001 (9) |
C17 | 0.0607 (11) | 0.0735 (13) | 0.0616 (11) | 0.0111 (9) | 0.0388 (9) | 0.0080 (10) |
C18 | 0.0454 (9) | 0.0591 (11) | 0.0454 (9) | 0.0002 (7) | 0.0225 (7) | 0.0031 (7) |
O19—C18 | 1.228 (2) | C2—H2 | 0.9800 |
N1—C2 | 1.446 (2) | C3—H3A | 0.9700 |
N1—C10 | 1.386 (2) | C3—H3B | 0.9700 |
N12—C4 | 1.470 (2) | C4—H4 | 0.9800 |
N12—C13 | 1.464 (2) | C6—H6 | 0.9300 |
N12—C18 | 1.347 (2) | C7—H7 | 0.9300 |
N1—H1 | 0.8600 | C8—H8 | 0.9300 |
C2—C11 | 1.516 (3) | C9—H9 | 0.9300 |
C2—C3 | 1.516 (2) | C11—H11A | 0.9600 |
C3—C4 | 1.524 (2) | C11—H11B | 0.9600 |
C4—C5 | 1.515 (2) | C11—H11C | 0.9600 |
C5—C6 | 1.387 (2) | C13—H13A | 0.9700 |
C5—C10 | 1.400 (2) | C13—H13B | 0.9700 |
C6—C7 | 1.373 (3) | C14—H14A | 0.9700 |
C7—C8 | 1.369 (3) | C14—H14B | 0.9700 |
C8—C9 | 1.375 (3) | C15—H15A | 0.9700 |
C9—C10 | 1.397 (2) | C15—H15B | 0.9700 |
C13—C14 | 1.515 (3) | C16—H16A | 0.9700 |
C14—C15 | 1.520 (3) | C16—H16B | 0.9700 |
C15—C16 | 1.517 (3) | C17—H17A | 0.9700 |
C16—C17 | 1.521 (3) | C17—H17B | 0.9700 |
C17—C18 | 1.512 (3) | ||
C2—N1—C10 | 119.82 (14) | C5—C4—H4 | 107.00 |
C4—N12—C13 | 118.48 (12) | C5—C6—H6 | 119.00 |
C4—N12—C18 | 118.62 (13) | C7—C6—H6 | 119.00 |
C13—N12—C18 | 122.79 (14) | C6—C7—H7 | 120.00 |
C2—N1—H1 | 120.00 | C8—C7—H7 | 120.00 |
C10—N1—H1 | 120.00 | C7—C8—H8 | 120.00 |
C3—C2—C11 | 112.49 (16) | C9—C8—H8 | 120.00 |
N1—C2—C3 | 108.91 (14) | C8—C9—H9 | 120.00 |
N1—C2—C11 | 109.66 (16) | C10—C9—H9 | 120.00 |
C2—C3—C4 | 109.79 (14) | C2—C11—H11A | 109.00 |
N12—C4—C5 | 111.95 (13) | C2—C11—H11B | 109.00 |
C3—C4—C5 | 111.08 (13) | C2—C11—H11C | 109.00 |
N12—C4—C3 | 112.50 (13) | H11A—C11—H11B | 110.00 |
C6—C5—C10 | 118.62 (15) | H11A—C11—H11C | 110.00 |
C4—C5—C6 | 121.27 (15) | H11B—C11—H11C | 109.00 |
C4—C5—C10 | 120.05 (14) | N12—C13—H13A | 109.00 |
C5—C6—C7 | 122.08 (17) | N12—C13—H13B | 109.00 |
C6—C7—C8 | 119.17 (19) | C14—C13—H13A | 109.00 |
C7—C8—C9 | 120.51 (18) | C14—C13—H13B | 109.00 |
C8—C9—C10 | 120.89 (17) | H13A—C13—H13B | 108.00 |
N1—C10—C5 | 120.90 (15) | C13—C14—H14A | 109.00 |
N1—C10—C9 | 120.33 (16) | C13—C14—H14B | 109.00 |
C5—C10—C9 | 118.75 (16) | C15—C14—H14A | 109.00 |
N12—C13—C14 | 114.22 (14) | C15—C14—H14B | 109.00 |
C13—C14—C15 | 114.23 (16) | H14A—C14—H14B | 108.00 |
C14—C15—C16 | 114.64 (18) | C14—C15—H15A | 109.00 |
C15—C16—C17 | 114.77 (18) | C14—C15—H15B | 109.00 |
C16—C17—C18 | 113.52 (17) | C16—C15—H15A | 109.00 |
N12—C18—C17 | 116.96 (16) | C16—C15—H15B | 109.00 |
O19—C18—N12 | 122.76 (16) | H15A—C15—H15B | 108.00 |
O19—C18—C17 | 120.27 (16) | C15—C16—H16A | 109.00 |
N1—C2—H2 | 109.00 | C15—C16—H16B | 109.00 |
C3—C2—H2 | 109.00 | C17—C16—H16A | 109.00 |
C11—C2—H2 | 109.00 | C17—C16—H16B | 109.00 |
C2—C3—H3A | 110.00 | H16A—C16—H16B | 108.00 |
C2—C3—H3B | 110.00 | C16—C17—H17A | 109.00 |
C4—C3—H3A | 110.00 | C16—C17—H17B | 109.00 |
C4—C3—H3B | 110.00 | C18—C17—H17A | 109.00 |
H3A—C3—H3B | 108.00 | C18—C17—H17B | 109.00 |
N12—C4—H4 | 107.00 | H17A—C17—H17B | 108.00 |
C3—C4—H4 | 107.00 | ||
C10—N1—C2—C3 | −44.6 (2) | C3—C4—C5—C6 | −160.41 (16) |
C10—N1—C2—C11 | −168.08 (16) | C3—C4—C5—C10 | 22.4 (2) |
C2—N1—C10—C5 | 16.6 (2) | C4—C5—C6—C7 | −176.99 (19) |
C2—N1—C10—C9 | −165.36 (16) | C10—C5—C6—C7 | 0.2 (3) |
C13—N12—C4—C3 | 56.10 (18) | C4—C5—C10—N1 | −4.7 (2) |
C13—N12—C4—C5 | −69.81 (17) | C4—C5—C10—C9 | 177.21 (15) |
C18—N12—C4—C3 | −127.62 (15) | C6—C5—C10—N1 | 178.05 (16) |
C18—N12—C4—C5 | 106.48 (16) | C6—C5—C10—C9 | 0.0 (2) |
C4—N12—C13—C14 | −113.04 (16) | C5—C6—C7—C8 | −0.5 (3) |
C18—N12—C13—C14 | 70.8 (2) | C6—C7—C8—C9 | 0.5 (3) |
C4—N12—C18—O19 | 1.8 (2) | C7—C8—C9—C10 | −0.3 (3) |
C4—N12—C18—C17 | −179.65 (14) | C8—C9—C10—N1 | −178.00 (17) |
C13—N12—C18—O19 | 177.93 (15) | C8—C9—C10—C5 | 0.1 (3) |
C13—N12—C18—C17 | −3.5 (2) | N12—C13—C14—C15 | −79.6 (2) |
N1—C2—C3—C4 | 60.77 (18) | C13—C14—C15—C16 | 56.7 (3) |
C11—C2—C3—C4 | −177.44 (16) | C14—C15—C16—C17 | −59.5 (3) |
C2—C3—C4—N12 | −176.30 (13) | C15—C16—C17—C18 | 83.3 (2) |
C2—C3—C4—C5 | −49.92 (18) | C16—C17—C18—O19 | 112.4 (2) |
N12—C4—C5—C6 | −33.7 (2) | C16—C17—C18—N12 | −66.2 (2) |
N12—C4—C5—C10 | 149.10 (14) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O19i | 0.86 | 2.40 | 2.988 (2) | 126 |
C14—H14A···O19ii | 0.97 | 2.57 | 3.320 (2) | 134 |
Symmetry codes: (i) x+1/2, −y+3/2, z−1/2; (ii) −x+1/2, y+1/2, −z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O19i | 0.86 | 2.40 | 2.988 (2) | 126 |
C14—H14A···O19ii | 0.97 | 2.57 | 3.320 (2) | 134 |
Symmetry codes: (i) x+1/2, −y+3/2, z−1/2; (ii) −x+1/2, y+1/2, −z+1/2. |
Acknowledgements
The authors are thankful to IOE, Vijnana Bhavana, University of Mysore, Mysore, for providing the single-crystal X-ray diffractometer facility.
References
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Konishi, M., Ohkuma, H., Tsuno, T. & Oki, T. (1990). J. Am. Chem. Soc. 112, 3715–3716. CSD CrossRef CAS Web of Science Google Scholar
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Tetrahydroquinolines are an important family of heterocyclic compounds having wide range of biological activities which includes antimalarial, antitumoral, antioxidant, etc. In particular 2-Methyl-1,2,3,4-tetrahydroquinoline is present in human brain and a natural antitumor antibiotic, has a complex structure built on the tetrahydroquinoline system (Konishi et al., 1990). Hence, in continuation of our effort to identify new quinoline based therapeutic agents, the title compound has been synthesized and herein we report its crystal structure.
The ORTEP of the molecule is shown in figure 1. The title compound is chiral. In the arbitrarily chosen asymmetric molecule, C2 has S configuration whereas C4 has R configuration. The azepan ring lies in the equatorial plane of the fused rings as indicated by the dihedral angle value of 66.28 (8)°. A study of torsion angles, asymmetric parameters and least squares plane calculations reveals that the quinoline ring in the structure adopts a half chair conformation with the atom C3 deviating by 0.3278 (18) Å from the least-squares plane defined by the atoms N1/C2/C3/C4/C5/C10. This is confirmed by the puckering amplitude Q = 0.4857 (18) Å. The structure exhibits weak intermolecular hydrogen bonds of the type C—H···O and N—H···O. The packing of the molecules when viewed along the a axis indicate that they are stacked in pairs.