



Supporting information
![]() | Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536812010495/cv5258sup1.cif |
![]() | Structure factor file (CIF format) https://doi.org/10.1107/S1600536812010495/cv5258Isup2.hkl |
![]() | Chemical Markup Language (CML) file https://doi.org/10.1107/S1600536812010495/cv5258Isup3.cml |
CCDC reference: 846306
Key indicators
- Single-crystal X-ray study
- T = 293 K
- Mean
(C-C) = 0.003 Å
- R factor = 0.043
- wR factor = 0.100
- Data-to-parameter ratio = 17.5
checkCIF/PLATON results
No syntax errors found
Alert level B PLAT934_ALERT_3_B Number of (Iobs-Icalc)/SigmaW .gt. 10 Outliers . 1
Alert level C PLAT910_ALERT_3_C Missing # of FCF Reflections Below Th(Min) ..... 7 PLAT912_ALERT_4_C Missing # of FCF Reflections Above STh/L= 0.600 3
Alert level G REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is correct. If it is not, please give the correct count in the _publ_section_exptl_refinement section of the submitted CIF. From the CIF: _diffrn_reflns_theta_max 27.00 From the CIF: _reflns_number_total 5570 Count of symmetry unique reflns 2834 Completeness (_total/calc) 196.54% TEST3: Check Friedels for noncentro structure Estimate of Friedel pairs measured 2736 Fraction of Friedel pairs measured 0.965 Are heavy atom types Z>Si present yes PLAT005_ALERT_5_G No _iucr_refine_instructions_details in CIF .... ? PLAT199_ALERT_1_G Check the Reported _cell_measurement_temperature 293 K PLAT200_ALERT_1_G Check the Reported _diffrn_ambient_temperature 293 K
0 ALERT level A = Most likely a serious problem - resolve or explain 1 ALERT level B = A potentially serious problem, consider carefully 2 ALERT level C = Check. Ensure it is not caused by an omission or oversight 4 ALERT level G = General information/check it is not something unexpected 2 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 0 ALERT type 2 Indicator that the structure model may be wrong or deficient 2 ALERT type 3 Indicator that the structure quality may be low 2 ALERT type 4 Improvement, methodology, query or suggestion 1 ALERT type 5 Informative message, check
Dimedone (1 x 10–3 mol) and 4-chloroaniline (1 x 10–3 mol) were taken in dry methanol (50 ml). To this mixture were added triethyl ammonium trifluoromethanesulfonate (30 mol %) and triethylamine (1 mol. equiv.). The reaction was refluxed on water bath. The reaction was monitored by thin layer chromatography, using methylene chloride - ethyl acetate (19: 1v/v) as solvent system. On completion of reaction (6 h) the contents of the flask were triturated with water and extracted with ethyl acetate. The organic layer was washed successively with brine (2 x 25 ml) and water (4 x 30 ml) dried on anhydrous sodium sulfate and filtered. The solvent was removed under reduced pressure. The residue was crystallized from chloroformmethanol(1: 25 v/v) to give compound 1, in 95% yield. For XRD studies, title compound was further purified by column chromatography on silica gel and crystallized again from chloroform-methanol. Single crystals were prepared by slow evaporation of its solution in chloroform. The structure of the compound was ascertained by spectral methods (MS, IR,1H-NMR, 13 C NMR, DEPT 135°). IR (KBr):νmaxcm-1 3451, 3250, 2922, 1635, 1597, 1565, 1493, 1369, 1242, 1171, 1088,1015, 1000, 924. 1H-NMR (400 MHz, CDCl3):δCH3x2), 2.19 (s, 2H, Hax2), 1.74 (s br exch. D2O, NHx1), 2.33 (s, 2H, Hex2), 5.49 (s, 1H, H-2), 7.07 (d, J= 8.8 Hz, 2H, H-arom), 7.27(d, J= 8.8 Hz, 2H). 13CNMR(100 MHz,CDCl3):δc 21.29, 28.2, 43.2, 50.2, 98.5, 124.9, 125.8, 128.7, 129.6, 130.6, 136.9, 160.7, 198.3.MS m/z 251.0870 (76), 249.0845 (M+) (100) (calc. for C14H16ClNO 249.0837), 233 (52), 231 (75), 94 (76), 81 (73).
H1A attached to N1A and H1B attached to N1B were located from the difference map and isotropically refined with the restraints N—H = 0.84 (3) Å. The remaining H atoms were positioned geometrically and were treated as riding on their parent C atoms, with C—H distances of 0.93–0.97 Å; and with Uiso(H) = 1.2-1.5 Ueq(C).
Enamines are versatile substrates for the preparation of useful bioactive alkaloids, such as pyrazoles (Heller & Natarajan 2006), quinolines (Katritzky et al.,1993) and carbazoles (Campaigine & Lake 1959). The compounds are generally prepared by heating aldehydes or ketones with primary amines in presence of strong acids.However, these methods are associated with the limitations of low yield, undesirable side reactions and polymerization. Therefore, there is a need to develop an alternative efficient methodology for the preparation of these compounds, under ambient reaction conditions.Herein, we describe the preparation and XRD studies of the model the title compound from dimedone and p-chloroaniline in the presence of triethylammonium trifluoromethanesulfonate and triethylamine at room temperature.
The asymmetric unit of the title compound comprises of two crystallographically independent molecules, A and B, respectively (Fig. 1). The geometry of both the asymmetric molecules, A and B, indicates a high degree of similarity in terms of their bond distances and bond angles. A comparison of these parameters with some related structures (Mehdi et al., 2010; Bertolasi et al., 1998) indicates a good agreement. The average aromatic bond length in the phenyl ring is 1.381 (3) Å for molecule A and 1.380 (3) Å for molecule B. For both the molecules, the average observed bond angle in the phenyl ring is 120.0 ° which coincides exactly with the theoretical value of sp2 hybridization. The length of the double bond C1=O1 [1.244 (3) (molecule A) and 1.247 (3) Å (molecule B)] is larger than the standard value for carbonyl group [1.192 Å] (Allen et al., 1987)and lengthening of the C1=O1 double bond is due to strong intermolecular hydrogen bond between N1 and O1. The dihedral angle between the cyclohexene ring and phenyl ring is 58.2 (1)° (molecule A) and 57.5 (1)° (molecule B). In cyclohexene ring, the C2=C3 distance of 1.361 (3) Å (molecule A) and 1.370 (3) Å (molecule B) confirms the localization of a double bond at this position. This double bond imposes a sofa conformation on cyclohexene ring, with asymmetry parameters: ΔCs (C2A—C5A) (molecule A) = 6.11; ΔCs (C2B—C5B) (molecule B) = 3.30.
In the crystal, adjacent molecules are interconnected through N—H···O hydrogen bonds (Table 1). The crystal structure is further stabilized by C—H···π hydrogen bonding (Table 1, Cg1 and Cg2 represent the centre of gravity of benzene ring C9—C14 in molecules A and B, respectively).
For related structures, see: Bertolasi et al. (1998); Mehdi et al. (2010). For general background to enamines as versatile substrates for the preparation of bioactive
alkaloids, see: Heller & Natarajan (2006); Katritzky et al. (1993); Campaigine & Lake (1959). For bond-length data, see: Allen et al. (1987).
Data collection: CrysAlis PRO (Oxford Diffraction, 2010); cell refinement: CrysAlis PRO (Oxford Diffraction, 2010); data reduction: CrysAlis PRO (Oxford Diffraction, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: PLATON (Spek, 2009).
![]() | Fig. 1. ORTEP view of the molecule with the atom-labeling scheme. The displacement ellipsoids are drawn at the 40% probability level. H atoms are shown as small spheres of arbitrary radii. |
C14H16ClNO | F(000) = 528 |
Mr = 249.73 | Dx = 1.283 Mg m−3 |
Monoclinic, Pc | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P -2yc | Cell parameters from 7292 reflections |
a = 7.4103 (2) Å | θ = 3.5–29.1° |
b = 15.1916 (5) Å | µ = 0.28 mm−1 |
c = 11.6408 (4) Å | T = 293 K |
β = 99.443 (3)° | Block, white |
V = 1292.70 (7) Å3 | 0.30 × 0.20 × 0.20 mm |
Z = 4 |
Oxford Diffraction Xcalibur Sapphire3 diffractometer | 5570 independent reflections |
Radiation source: fine-focus sealed tube | 4069 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.034 |
Detector resolution: 0 pixels mm-1 | θmax = 27.0°, θmin = 3.6° |
ω scans | h = −9→9 |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2010) | k = −19→19 |
Tmin = 0.961, Tmax = 1.000 | l = −14→14 |
19792 measured reflections |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.043 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.100 | w = 1/[σ2(Fo2) + (0.0374P)2 + 0.1217P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max = 0.001 |
5570 reflections | Δρmax = 0.15 e Å−3 |
319 parameters | Δρmin = −0.21 e Å−3 |
2 restraints | Absolute structure: Flack (1983), 2721 Friedel pairs |
Primary atom site location: structure-invariant direct methods | Absolute structure parameter: −0.04 (5) |
C14H16ClNO | V = 1292.70 (7) Å3 |
Mr = 249.73 | Z = 4 |
Monoclinic, Pc | Mo Kα radiation |
a = 7.4103 (2) Å | µ = 0.28 mm−1 |
b = 15.1916 (5) Å | T = 293 K |
c = 11.6408 (4) Å | 0.30 × 0.20 × 0.20 mm |
β = 99.443 (3)° |
Oxford Diffraction Xcalibur Sapphire3 diffractometer | 5570 independent reflections |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2010) | 4069 reflections with I > 2σ(I) |
Tmin = 0.961, Tmax = 1.000 | Rint = 0.034 |
19792 measured reflections |
R[F2 > 2σ(F2)] = 0.043 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.100 | Δρmax = 0.15 e Å−3 |
S = 1.03 | Δρmin = −0.21 e Å−3 |
5570 reflections | Absolute structure: Flack (1983), 2721 Friedel pairs |
319 parameters | Absolute structure parameter: −0.04 (5) |
2 restraints |
Experimental. CrysAlis PRO, Oxford Diffraction Ltd., Version 1.171.34.40 (release 27–08-2010 CrysAlis171. NET) (compiled Aug 27 2010,11:50:40) Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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 > σ(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 | ||
Cl1A | 0.02376 (10) | 0.84221 (5) | −0.37777 (6) | 0.0695 (3) | |
N1A | 0.1625 (3) | 0.86014 (14) | 0.13741 (18) | 0.0394 (5) | |
C1A | 0.6616 (3) | 0.87416 (14) | 0.2364 (2) | 0.0361 (6) | |
C3A | 0.3290 (3) | 0.86484 (13) | 0.20386 (19) | 0.0307 (5) | |
O1A | 0.8071 (2) | 0.88210 (13) | 0.19728 (17) | 0.0576 (6) | |
C6A | 0.6634 (3) | 0.87541 (16) | 0.3650 (2) | 0.0418 (6) | |
H61A | 0.7716 | 0.9066 | 0.4022 | 0.050* | |
H62A | 0.6712 | 0.8154 | 0.3938 | 0.050* | |
C4A | 0.3259 (3) | 0.87268 (15) | 0.3326 (2) | 0.0400 (6) | |
H42A | 0.3182 | 0.8142 | 0.3649 | 0.048* | |
H41A | 0.2170 | 0.9048 | 0.3440 | 0.048* | |
C12A | 0.0607 (3) | 0.84585 (15) | −0.2259 (2) | 0.0404 (6) | |
C13A | 0.1651 (3) | 0.78103 (16) | −0.1636 (2) | 0.0441 (7) | |
H13 | 0.2131 | 0.7353 | −0.2022 | 0.053* | |
C2A | 0.4897 (3) | 0.86468 (14) | 0.1616 (2) | 0.0322 (5) | |
H2A | 0.4875 | 0.8582 | 0.0820 | 0.039* | |
C10A | 0.0213 (3) | 0.91674 (15) | −0.0498 (2) | 0.0422 (6) | |
H10A | −0.0282 | 0.9621 | −0.0111 | 0.051* | |
C14A | 0.1978 (3) | 0.78474 (15) | −0.0433 (2) | 0.0399 (6) | |
H14A | 0.2665 | 0.7410 | −0.0007 | 0.048* | |
C11A | −0.0134 (3) | 0.91349 (15) | −0.1705 (2) | 0.0431 (6) | |
H11A | −0.0853 | 0.9562 | −0.2130 | 0.052* | |
C5A | 0.4937 (3) | 0.91935 (15) | 0.39910 (19) | 0.0366 (6) | |
C9A | 0.1283 (3) | 0.85343 (14) | 0.0136 (2) | 0.0340 (6) | |
C7A | 0.4922 (3) | 1.01738 (15) | 0.3674 (2) | 0.0436 (6) | |
H72A | 0.3848 | 1.0447 | 0.3876 | 0.065* | |
H73A | 0.4916 | 1.0236 | 0.2853 | 0.065* | |
H71A | 0.5993 | 1.0453 | 0.4095 | 0.065* | |
C8A | 0.4948 (4) | 0.9102 (2) | 0.5304 (2) | 0.0578 (8) | |
H83A | 0.4911 | 0.8490 | 0.5503 | 0.087* | |
H81A | 0.3899 | 0.9396 | 0.5509 | 0.087* | |
H82A | 0.6042 | 0.9364 | 0.5721 | 0.087* | |
Cl1B | 0.53853 (10) | 0.65806 (5) | −0.33380 (7) | 0.0718 (3) | |
C1B | 1.1802 (3) | 0.62985 (15) | 0.2807 (2) | 0.0398 (6) | |
C11B | 0.6804 (3) | 0.71986 (15) | −0.1197 (2) | 0.0431 (6) | |
H11B | 0.7258 | 0.7663 | −0.1585 | 0.052* | |
C12B | 0.5780 (3) | 0.65421 (16) | −0.1819 (2) | 0.0429 (6) | |
C3B | 0.8480 (3) | 0.63611 (14) | 0.2483 (2) | 0.0342 (6) | |
N1B | 0.6810 (3) | 0.64009 (13) | 0.1810 (2) | 0.0416 (6) | |
C4B | 0.8453 (3) | 0.62493 (15) | 0.3765 (2) | 0.0395 (6) | |
H42B | 0.7358 | 0.5929 | 0.3866 | 0.047* | |
H41B | 0.8391 | 0.6826 | 0.4116 | 0.047* | |
C2B | 1.0094 (3) | 0.64015 (14) | 0.2057 (2) | 0.0376 (6) | |
H2B | 1.0074 | 0.6497 | 0.1266 | 0.045* | |
C6B | 1.1831 (3) | 0.62237 (15) | 0.4087 (2) | 0.0420 (6) | |
H62B | 1.1919 | 0.6809 | 0.4424 | 0.050* | |
H61B | 1.2914 | 0.5899 | 0.4428 | 0.050* | |
C14B | 0.5403 (3) | 0.58314 (15) | −0.0062 (2) | 0.0448 (7) | |
H14B | 0.4913 | 0.5376 | 0.0323 | 0.054* | |
C10B | 0.7145 (3) | 0.71586 (15) | −0.0002 (2) | 0.0397 (6) | |
H10B | 0.7831 | 0.7598 | 0.0422 | 0.048* | |
C9B | 0.6466 (3) | 0.64625 (15) | 0.0577 (2) | 0.0351 (6) | |
C13B | 0.5053 (3) | 0.58639 (16) | −0.1263 (2) | 0.0480 (7) | |
H13' | 0.4337 | 0.5434 | −0.1688 | 0.058* | |
O1B | 1.3270 (2) | 0.62702 (14) | 0.24154 (19) | 0.0645 (6) | |
C5B | 1.0126 (3) | 0.57602 (14) | 0.4406 (2) | 0.0374 (6) | |
C7B | 1.0128 (4) | 0.58084 (17) | 0.5718 (2) | 0.0543 (7) | |
H73B | 0.9032 | 0.5541 | 0.5896 | 0.081* | |
H72B | 1.0177 | 0.6413 | 0.5961 | 0.081* | |
H71B | 1.1175 | 0.5501 | 0.6122 | 0.081* | |
C8B | 1.0106 (3) | 0.47940 (15) | 0.4026 (2) | 0.0467 (7) | |
H83B | 0.9045 | 0.4508 | 0.4225 | 0.070* | |
H81B | 1.1189 | 0.4505 | 0.4414 | 0.070* | |
H82B | 1.0072 | 0.4763 | 0.3199 | 0.070* | |
H1B | 0.587 (4) | 0.6320 (16) | 0.210 (2) | 0.057 (8)* | |
H1A | 0.067 (4) | 0.8708 (15) | 0.167 (2) | 0.047 (7)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1A | 0.0762 (7) | 0.0863 (6) | 0.0423 (6) | 0.0071 (4) | −0.0012 (7) | −0.0017 (4) |
N1A | 0.0234 (11) | 0.0560 (13) | 0.0409 (14) | −0.0008 (8) | 0.0113 (10) | −0.0050 (9) |
C1A | 0.0256 (13) | 0.0372 (13) | 0.0465 (16) | 0.0029 (9) | 0.0089 (11) | −0.0111 (10) |
C3A | 0.0266 (12) | 0.0317 (11) | 0.0347 (14) | −0.0023 (9) | 0.0074 (11) | −0.0006 (9) |
O1A | 0.0259 (10) | 0.0883 (14) | 0.0613 (13) | −0.0067 (9) | 0.0147 (9) | −0.0300 (10) |
C6A | 0.0349 (14) | 0.0495 (15) | 0.0380 (15) | 0.0096 (11) | −0.0029 (12) | −0.0020 (11) |
C4A | 0.0364 (14) | 0.0477 (14) | 0.0394 (15) | −0.0050 (11) | 0.0173 (12) | 0.0029 (11) |
C12A | 0.0329 (13) | 0.0518 (14) | 0.0352 (15) | −0.0047 (10) | 0.0017 (11) | −0.0027 (11) |
C13A | 0.0347 (14) | 0.0463 (14) | 0.0489 (18) | 0.0058 (10) | −0.0005 (13) | −0.0120 (11) |
C2A | 0.0254 (12) | 0.0430 (13) | 0.0299 (13) | 0.0000 (9) | 0.0096 (10) | −0.0046 (10) |
C10A | 0.0315 (14) | 0.0429 (14) | 0.0533 (18) | 0.0042 (11) | 0.0104 (12) | −0.0051 (12) |
C14A | 0.0305 (13) | 0.0387 (13) | 0.0480 (17) | 0.0047 (10) | −0.0004 (12) | −0.0019 (11) |
C11A | 0.0356 (14) | 0.0414 (14) | 0.0509 (18) | 0.0066 (10) | 0.0034 (13) | 0.0041 (11) |
C5A | 0.0370 (14) | 0.0443 (13) | 0.0297 (14) | 0.0021 (10) | 0.0091 (12) | 0.0028 (10) |
C9A | 0.0194 (11) | 0.0412 (13) | 0.0418 (16) | −0.0026 (9) | 0.0062 (11) | −0.0016 (10) |
C7A | 0.0457 (15) | 0.0436 (14) | 0.0430 (15) | 0.0041 (11) | 0.0117 (12) | −0.0065 (11) |
C8A | 0.0677 (19) | 0.0769 (19) | 0.0302 (15) | 0.0024 (15) | 0.0121 (14) | 0.0026 (13) |
Cl1B | 0.0730 (7) | 0.0900 (7) | 0.0497 (7) | −0.0030 (4) | 0.0022 (7) | −0.0010 (4) |
C1B | 0.0206 (12) | 0.0401 (14) | 0.0596 (19) | −0.0018 (9) | 0.0088 (12) | 0.0049 (11) |
C11B | 0.0362 (14) | 0.0375 (13) | 0.0562 (19) | −0.0032 (10) | 0.0097 (13) | 0.0027 (12) |
C12B | 0.0318 (13) | 0.0513 (15) | 0.0445 (16) | 0.0063 (11) | 0.0030 (12) | 0.0011 (11) |
C3B | 0.0225 (12) | 0.0338 (12) | 0.0472 (17) | 0.0035 (9) | 0.0080 (11) | 0.0011 (10) |
N1B | 0.0189 (11) | 0.0573 (13) | 0.0504 (15) | −0.0005 (9) | 0.0114 (11) | 0.0061 (10) |
C4B | 0.0274 (13) | 0.0462 (14) | 0.0473 (16) | 0.0048 (10) | 0.0128 (12) | 0.0029 (11) |
C2B | 0.0241 (13) | 0.0433 (13) | 0.0464 (16) | 0.0008 (9) | 0.0089 (12) | 0.0061 (11) |
C6B | 0.0278 (13) | 0.0411 (13) | 0.0546 (18) | −0.0048 (10) | −0.0003 (12) | 0.0032 (11) |
C14B | 0.0284 (13) | 0.0435 (15) | 0.062 (2) | −0.0059 (10) | 0.0055 (13) | 0.0062 (12) |
C10B | 0.0282 (12) | 0.0382 (13) | 0.0532 (17) | −0.0041 (9) | 0.0082 (12) | −0.0037 (11) |
C9B | 0.0188 (11) | 0.0391 (12) | 0.0479 (17) | 0.0027 (9) | 0.0073 (12) | 0.0027 (10) |
C13B | 0.0324 (14) | 0.0439 (15) | 0.065 (2) | −0.0054 (11) | −0.0008 (13) | −0.0058 (13) |
O1B | 0.0222 (10) | 0.0935 (15) | 0.0808 (17) | 0.0033 (9) | 0.0176 (11) | 0.0169 (11) |
C5B | 0.0312 (13) | 0.0379 (13) | 0.0435 (16) | −0.0014 (10) | 0.0071 (12) | 0.0027 (10) |
C7B | 0.0528 (17) | 0.0598 (17) | 0.0499 (18) | −0.0035 (13) | 0.0075 (14) | 0.0030 (13) |
C8B | 0.0389 (14) | 0.0401 (14) | 0.0627 (19) | −0.0020 (11) | 0.0127 (13) | 0.0049 (12) |
Cl1A—C12A | 1.744 (3) | Cl1B—C12B | 1.745 (3) |
N1A—C3A | 1.346 (3) | C1B—O1B | 1.247 (3) |
N1A—C9A | 1.426 (3) | C1B—C2B | 1.424 (3) |
N1A—H1A | 0.85 (3) | C1B—C6B | 1.491 (4) |
C1A—O1A | 1.244 (3) | C11B—C10B | 1.374 (3) |
C1A—C2A | 1.427 (3) | C11B—C12B | 1.383 (3) |
C1A—C6A | 1.495 (3) | C11B—H11B | 0.9300 |
C3A—C2A | 1.361 (3) | C12B—C13B | 1.373 (3) |
C3A—C4A | 1.508 (3) | C3B—N1B | 1.353 (3) |
C6A—C5A | 1.533 (3) | C3B—C2B | 1.370 (3) |
C6A—H61A | 0.9700 | C3B—C4B | 1.506 (3) |
C6A—H62A | 0.9700 | N1B—C9B | 1.418 (3) |
C4A—C5A | 1.527 (3) | N1B—H1B | 0.83 (3) |
C4A—H42A | 0.9700 | C4B—C5B | 1.530 (3) |
C4A—H41A | 0.9700 | C4B—H42B | 0.9700 |
C12A—C11A | 1.375 (3) | C4B—H41B | 0.9700 |
C12A—C13A | 1.382 (3) | C2B—H2B | 0.9300 |
C13A—C14A | 1.382 (3) | C6B—C5B | 1.544 (3) |
C13A—H13 | 0.9300 | C6B—H62B | 0.9700 |
C2A—H2A | 0.9300 | C6B—H61B | 0.9700 |
C10A—C9A | 1.381 (3) | C14B—C9B | 1.379 (3) |
C10A—C11A | 1.387 (3) | C14B—C13B | 1.380 (3) |
C10A—H10A | 0.9300 | C14B—H14B | 0.9300 |
C14A—C9A | 1.380 (3) | C10B—C9B | 1.392 (3) |
C14A—H14A | 0.9300 | C10B—H10B | 0.9300 |
C11A—H11A | 0.9300 | C13B—H13' | 0.9300 |
C5A—C8A | 1.533 (3) | C5B—C7B | 1.529 (4) |
C5A—C7A | 1.534 (3) | C5B—C8B | 1.533 (3) |
C7A—H72A | 0.9600 | C7B—H73B | 0.9600 |
C7A—H73A | 0.9600 | C7B—H72B | 0.9600 |
C7A—H71A | 0.9600 | C7B—H71B | 0.9600 |
C8A—H83A | 0.9600 | C8B—H83B | 0.9600 |
C8A—H81A | 0.9600 | C8B—H81B | 0.9600 |
C8A—H82A | 0.9600 | C8B—H82B | 0.9600 |
C3A—N1A—C9A | 125.35 (19) | O1B—C1B—C2B | 121.4 (3) |
C3A—N1A—H1A | 120.2 (18) | O1B—C1B—C6B | 119.5 (2) |
C9A—N1A—H1A | 113.6 (18) | C2B—C1B—C6B | 119.1 (2) |
O1A—C1A—C2A | 121.8 (2) | C10B—C11B—C12B | 119.5 (2) |
O1A—C1A—C6A | 120.0 (2) | C10B—C11B—H11B | 120.3 |
C2A—C1A—C6A | 118.2 (2) | C12B—C11B—H11B | 120.3 |
N1A—C3A—C2A | 124.5 (2) | C13B—C12B—C11B | 121.2 (3) |
N1A—C3A—C4A | 114.42 (19) | C13B—C12B—Cl1B | 119.3 (2) |
C2A—C3A—C4A | 121.1 (2) | C11B—C12B—Cl1B | 119.5 (2) |
C1A—C6A—C5A | 113.10 (17) | N1B—C3B—C2B | 123.9 (2) |
C1A—C6A—H61A | 109.0 | N1B—C3B—C4B | 114.8 (2) |
C5A—C6A—H61A | 109.0 | C2B—C3B—C4B | 121.2 (2) |
C1A—C6A—H62A | 109.0 | C3B—N1B—C9B | 125.8 (2) |
C5A—C6A—H62A | 109.0 | C3B—N1B—H1B | 121 (2) |
H61A—C6A—H62A | 107.8 | C9B—N1B—H1B | 113 (2) |
C3A—C4A—C5A | 113.37 (18) | C3B—C4B—C5B | 113.35 (19) |
C3A—C4A—H42A | 108.9 | C3B—C4B—H42B | 108.9 |
C5A—C4A—H42A | 108.9 | C5B—C4B—H42B | 108.9 |
C3A—C4A—H41A | 108.9 | C3B—C4B—H41B | 108.9 |
C5A—C4A—H41A | 108.9 | C5B—C4B—H41B | 108.9 |
H42A—C4A—H41A | 107.7 | H42B—C4B—H41B | 107.7 |
C11A—C12A—C13A | 121.2 (2) | C3B—C2B—C1B | 121.0 (2) |
C11A—C12A—Cl1A | 119.41 (19) | C3B—C2B—H2B | 119.5 |
C13A—C12A—Cl1A | 119.40 (19) | C1B—C2B—H2B | 119.5 |
C14A—C13A—C12A | 119.5 (2) | C1B—C6B—C5B | 113.41 (19) |
C14A—C13A—H13 | 120.2 | C1B—C6B—H62B | 108.9 |
C12A—C13A—H13 | 120.2 | C5B—C6B—H62B | 108.9 |
C3A—C2A—C1A | 121.7 (2) | C1B—C6B—H61B | 108.9 |
C3A—C2A—H2A | 119.1 | C5B—C6B—H61B | 108.9 |
C1A—C2A—H2A | 119.1 | H62B—C6B—H61B | 107.7 |
C9A—C10A—C11A | 120.7 (2) | C9B—C14B—C13B | 121.2 (2) |
C9A—C10A—H10A | 119.6 | C9B—C14B—H14B | 119.4 |
C11A—C10A—H10A | 119.6 | C13B—C14B—H14B | 119.4 |
C9A—C14A—C13A | 120.0 (2) | C11B—C10B—C9B | 120.2 (2) |
C9A—C14A—H14A | 120.0 | C11B—C10B—H10B | 119.9 |
C13A—C14A—H14A | 120.0 | C9B—C10B—H10B | 119.9 |
C12A—C11A—C10A | 118.7 (2) | C14B—C9B—C10B | 119.1 (2) |
C12A—C11A—H11A | 120.6 | C14B—C9B—N1B | 119.5 (2) |
C10A—C11A—H11A | 120.6 | C10B—C9B—N1B | 121.4 (2) |
C4A—C5A—C6A | 107.51 (19) | C12B—C13B—C14B | 118.8 (2) |
C4A—C5A—C8A | 109.5 (2) | C12B—C13B—H13' | 120.6 |
C6A—C5A—C8A | 110.39 (19) | C14B—C13B—H13' | 120.6 |
C4A—C5A—C7A | 110.86 (19) | C7B—C5B—C4B | 109.3 (2) |
C6A—C5A—C7A | 109.52 (19) | C7B—C5B—C8B | 109.45 (19) |
C8A—C5A—C7A | 109.0 (2) | C4B—C5B—C8B | 110.84 (19) |
C14A—C9A—C10A | 119.8 (2) | C7B—C5B—C6B | 110.6 (2) |
C14A—C9A—N1A | 121.4 (2) | C4B—C5B—C6B | 106.90 (18) |
C10A—C9A—N1A | 118.8 (2) | C8B—C5B—C6B | 109.67 (19) |
C5A—C7A—H72A | 109.5 | C5B—C7B—H73B | 109.5 |
C5A—C7A—H73A | 109.5 | C5B—C7B—H72B | 109.5 |
H72A—C7A—H73A | 109.5 | H73B—C7B—H72B | 109.5 |
C5A—C7A—H71A | 109.5 | C5B—C7B—H71B | 109.5 |
H72A—C7A—H71A | 109.5 | H73B—C7B—H71B | 109.5 |
H73A—C7A—H71A | 109.5 | H72B—C7B—H71B | 109.5 |
C5A—C8A—H83A | 109.5 | C5B—C8B—H83B | 109.5 |
C5A—C8A—H81A | 109.5 | C5B—C8B—H81B | 109.5 |
H83A—C8A—H81A | 109.5 | H83B—C8B—H81B | 109.5 |
C5A—C8A—H82A | 109.5 | C5B—C8B—H82B | 109.5 |
H83A—C8A—H82A | 109.5 | H83B—C8B—H82B | 109.5 |
H81A—C8A—H82A | 109.5 | H81B—C8B—H82B | 109.5 |
C9A—N1A—C3A—C2A | 0.7 (4) | C10B—C11B—C12B—C13B | 1.9 (4) |
C9A—N1A—C3A—C4A | 179.28 (19) | C10B—C11B—C12B—Cl1B | −178.72 (17) |
O1A—C1A—C6A—C5A | 145.2 (2) | C2B—C3B—N1B—C9B | 2.0 (4) |
C2A—C1A—C6A—C5A | −34.1 (3) | C4B—C3B—N1B—C9B | −176.87 (19) |
N1A—C3A—C4A—C5A | −153.0 (2) | N1B—C3B—C4B—C5B | 150.9 (2) |
C2A—C3A—C4A—C5A | 25.6 (3) | C2B—C3B—C4B—C5B | −28.0 (3) |
C11A—C12A—C13A—C14A | −0.8 (4) | N1B—C3B—C2B—C1B | −175.9 (2) |
Cl1A—C12A—C13A—C14A | 178.69 (18) | C4B—C3B—C2B—C1B | 2.9 (3) |
N1A—C3A—C2A—C1A | 176.9 (2) | O1B—C1B—C2B—C3B | 174.7 (2) |
C4A—C3A—C2A—C1A | −1.6 (3) | C6B—C1B—C2B—C3B | −5.3 (3) |
O1A—C1A—C2A—C3A | −173.3 (2) | O1B—C1B—C6B—C5B | −147.5 (2) |
C6A—C1A—C2A—C3A | 6.0 (3) | C2B—C1B—C6B—C5B | 32.5 (3) |
C12A—C13A—C14A—C9A | −0.8 (3) | C12B—C11B—C10B—C9B | 0.1 (3) |
C13A—C12A—C11A—C10A | 1.2 (4) | C13B—C14B—C9B—C10B | 2.1 (3) |
Cl1A—C12A—C11A—C10A | −178.33 (17) | C13B—C14B—C9B—N1B | −179.3 (2) |
C9A—C10A—C11A—C12A | 0.1 (3) | C11B—C10B—C9B—C14B | −2.0 (3) |
C3A—C4A—C5A—C6A | −50.4 (2) | C11B—C10B—C9B—N1B | 179.46 (19) |
C3A—C4A—C5A—C8A | −170.3 (2) | C3B—N1B—C9B—C14B | 122.7 (2) |
C3A—C4A—C5A—C7A | 69.3 (2) | C3B—N1B—C9B—C10B | −58.8 (3) |
C1A—C6A—C5A—C4A | 54.9 (2) | C11B—C12B—C13B—C14B | −1.8 (4) |
C1A—C6A—C5A—C8A | 174.3 (2) | Cl1B—C12B—C13B—C14B | 178.80 (18) |
C1A—C6A—C5A—C7A | −65.6 (2) | C9B—C14B—C13B—C12B | −0.2 (4) |
C13A—C14A—C9A—C10A | 2.1 (3) | C3B—C4B—C5B—C7B | 171.04 (19) |
C13A—C14A—C9A—N1A | −178.7 (2) | C3B—C4B—C5B—C8B | −68.2 (3) |
C11A—C10A—C9A—C14A | −1.8 (3) | C3B—C4B—C5B—C6B | 51.3 (3) |
C11A—C10A—C9A—N1A | 179.1 (2) | C1B—C6B—C5B—C7B | −172.9 (2) |
C3A—N1A—C9A—C14A | 58.4 (3) | C1B—C6B—C5B—C4B | −53.9 (2) |
C3A—N1A—C9A—C10A | −122.4 (2) |
Cg1 and Cg2 are the centroids of the C9A–C14A and C9B–C14B rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1A—H1A···O1Ai | 0.85 (3) | 2.02 (3) | 2.852 (3) | 165 (2) |
N1B—H1B···O1Bi | 0.83 (3) | 2.02 (3) | 2.833 (3) | 165 (2) |
C7A—H72A···Cg1ii | 0.96 | 2.71 | 3.637 (3) | 163 |
C8B—H83B···Cg2iii | 0.96 | 2.70 | 3.640 (3) | 167 |
Symmetry codes: (i) x−1, y, z; (ii) x, −y, z+1/2; (iii) x, −y+1, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C14H16ClNO |
Mr | 249.73 |
Crystal system, space group | Monoclinic, Pc |
Temperature (K) | 293 |
a, b, c (Å) | 7.4103 (2), 15.1916 (5), 11.6408 (4) |
β (°) | 99.443 (3) |
V (Å3) | 1292.70 (7) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.28 |
Crystal size (mm) | 0.30 × 0.20 × 0.20 |
Data collection | |
Diffractometer | Oxford Diffraction Xcalibur Sapphire3 |
Absorption correction | Multi-scan (CrysAlis RED; Oxford Diffraction, 2010) |
Tmin, Tmax | 0.961, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 19792, 5570, 4069 |
Rint | 0.034 |
(sin θ/λ)max (Å−1) | 0.639 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.043, 0.100, 1.03 |
No. of reflections | 5570 |
No. of parameters | 319 |
No. of restraints | 2 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.15, −0.21 |
Absolute structure | Flack (1983), 2721 Friedel pairs |
Absolute structure parameter | −0.04 (5) |
Computer programs: CrysAlis PRO (Oxford Diffraction, 2010), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997), PLATON (Spek, 2009).
Cg1 and Cg2 are the centroids of the C9A–C14A and C9B–C14B rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1A—H1A···O1Ai | 0.85 (3) | 2.02 (3) | 2.852 (3) | 165 (2) |
N1B—H1B···O1Bi | 0.83 (3) | 2.02 (3) | 2.833 (3) | 165 (2) |
C7A—H72A···Cg1ii | 0.96 | 2.705 | 3.637 (3) | 163 |
C8B—H83B···Cg2iii | 0.96 | 2.697 | 3.640 (3) | 167 |
Symmetry codes: (i) x−1, y, z; (ii) x, −y, z+1/2; (iii) x, −y+1, z+1/2. |
Enamines are versatile substrates for the preparation of useful bioactive alkaloids, such as pyrazoles (Heller & Natarajan 2006), quinolines (Katritzky et al.,1993) and carbazoles (Campaigine & Lake 1959). The compounds are generally prepared by heating aldehydes or ketones with primary amines in presence of strong acids.However, these methods are associated with the limitations of low yield, undesirable side reactions and polymerization. Therefore, there is a need to develop an alternative efficient methodology for the preparation of these compounds, under ambient reaction conditions.Herein, we describe the preparation and XRD studies of the model the title compound from dimedone and p-chloroaniline in the presence of triethylammonium trifluoromethanesulfonate and triethylamine at room temperature.
The asymmetric unit of the title compound comprises of two crystallographically independent molecules, A and B, respectively (Fig. 1). The geometry of both the asymmetric molecules, A and B, indicates a high degree of similarity in terms of their bond distances and bond angles. A comparison of these parameters with some related structures (Mehdi et al., 2010; Bertolasi et al., 1998) indicates a good agreement. The average aromatic bond length in the phenyl ring is 1.381 (3) Å for molecule A and 1.380 (3) Å for molecule B. For both the molecules, the average observed bond angle in the phenyl ring is 120.0 ° which coincides exactly with the theoretical value of sp2 hybridization. The length of the double bond C1=O1 [1.244 (3) (molecule A) and 1.247 (3) Å (molecule B)] is larger than the standard value for carbonyl group [1.192 Å] (Allen et al., 1987)and lengthening of the C1=O1 double bond is due to strong intermolecular hydrogen bond between N1 and O1. The dihedral angle between the cyclohexene ring and phenyl ring is 58.2 (1)° (molecule A) and 57.5 (1)° (molecule B). In cyclohexene ring, the C2=C3 distance of 1.361 (3) Å (molecule A) and 1.370 (3) Å (molecule B) confirms the localization of a double bond at this position. This double bond imposes a sofa conformation on cyclohexene ring, with asymmetry parameters: ΔCs (C2A—C5A) (molecule A) = 6.11; ΔCs (C2B—C5B) (molecule B) = 3.30.
In the crystal, adjacent molecules are interconnected through N—H···O hydrogen bonds (Table 1). The crystal structure is further stabilized by C—H···π hydrogen bonding (Table 1, Cg1 and Cg2 represent the centre of gravity of benzene ring C9—C14 in molecules A and B, respectively).