organic compounds
(Z)-Ethyl 2-(4-chlorophenyl)-3-[(2,4-difluorophenyl)amino]prop-2-enoate
aCollege of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, People's Republic of China
*Correspondence e-mail: xiaozhuping2005@163.com
In the title compound, C17H14ClF2NO2, the aminoacryloyloxy group makes dihedral angles of 47.55 (11)° with the 4-chlorophenyl group and 8.74 (12)° with the difluorophenyl group; the dihedral angle between the rings is 52.32 (11)°. The structure of the title compound reveals a Z configuration with respect to the C=C double bond in the aminoacrylate fragment. A bifurcated intramolecular N—H⋯(O,F) hydrogen bond occurs. In the crystal, molecules are linked into chains by C—H⋯O hydrogen bonds.
Related literature
For background to . For applications of see: Xiao et al. (2007, 2008a,b,c).
see: You & Zhu, 2006Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 2007); cell SMART; data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536810043801/bq2244sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810043801/bq2244Isup2.hkl
Equimolar quantities (6 mmol) of ethyl 2-(4-chlorophenyl)-3-oxopropanoate (1.36 g) and 2,4-difluorobenzenamine (0.77 g) in absolute alcohol (18 ml) were heated at 344–354 K for 2 h. The excess solvent was removed under reduced pressure. The residue was purified by a flash
with EtOAc–petrolum ether (1:6, v/v) to afford two fractions. The second fraction gave a E-isomer, and the first fraction, after partial solvent evaporated, furnished colorless blocks of (I) suitable for single-crystal structure determination.The H atom bonded to N1 was located in a difference Fourier map. All other H atoms were placed in geometrically idealized positions and constrained to ride on their parent atoms with C—H = 0.93, 0.96 and 0.97 Å for the aromatic, CH3 and CH2 type H atoms, respectively. Uiso = 1.2Ueq(parent atoms) were assigned for aromatic and CH2 type H-atoms and 1.5Ueq(parent atoms) for CH3 type H-atoms.
A 2-aryl-3-arylaminoacrylate contains characteristic N—C═C bond and is therefore identified as enamine. It is well known that Schiff base harbors an N═C—C bond, which indicates that an enamine is the tautomeric isomer of the correspond Schiff base. like (You & Zhu, 2006), show good antimicrobial activities (Xiao et al., 2007; Xiao et al., 2008a), especially against bacterium. On the other hand, an enamine is the key intermediate for anticancer agents, 3-arylquinolone (Xiao et al., 2008b) and 3-arylquinoline (Xiao et al., 2008c). In a continuation of our work on the structural characterization of enamine derivatives, we report herein the of the title compound, (I).
The bond length of C13—N1 (1.344 (4) Å) is shorter than standard C—N single bond (1.48 Å) but longer than C—N double bond (1.28 Å), indicating that the p orbital of N1 is conjugated with the π of C13—C14 double bond. For the same reason, C1—N1 (1.394 (4) Å) is single bond with some double-bond character. The stereochemistry of the double bond in aminoacrylate moiety was assigned as (E)-configuration based on X-ray crystallography (Fig. 1) of the title compound.
Aminoacryloyloxy moiety, O2—C15—O1—C14—C13, forms a plane with the mean deviation of 0.0249 Å, which makes a dihedral angle of 47.55 (11) ° with the 4-chlorophenyl group and 8.74 (12) ° with the difluorophenyl group. The molecules are linked through intermolecular C—H···O hydrogen bonds, forming an infinite one-dimensional ribbons (Table 1, Fig. 2).
For background to
see: You & Zhu, 2006. For applications of see: Xiao et al. (2007, 2008a,b,c). [Please check amended text]Data collection: SMART (Bruker, 2007); cell
SMART (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C17H14ClF2NO2 | F(000) = 696 |
Mr = 337.74 | Dx = 1.426 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 1318 reflections |
a = 16.276 (3) Å | θ = 1.8–24.7° |
b = 7.5030 (15) Å | µ = 0.27 mm−1 |
c = 13.812 (3) Å | T = 298 K |
β = 111.11 (3)° | Block, colourless |
V = 1573.5 (5) Å3 | 0.30 × 0.10 × 0.10 mm |
Z = 4 |
Bruker SMART CCD area-detector diffractometer | 2824 independent reflections |
Radiation source: fine-focus sealed tube | 1566 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.027 |
φ and ω scans | θmax = 25.3°, θmin = 1.3° |
Absorption correction: ψ scan (North et al., 1968) | h = −19→18 |
Tmin = 0.923, Tmax = 0.973 | k = −9→0 |
2957 measured reflections | l = 0→16 |
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)] = 0.065 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.170 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.99 | w = 1/[σ2(Fo2) + (0.0804P)2] where P = (Fo2 + 2Fc2)/3 |
2824 reflections | (Δ/σ)max < 0.001 |
213 parameters | Δρmax = 0.26 e Å−3 |
0 restraints | Δρmin = −0.29 e Å−3 |
C17H14ClF2NO2 | V = 1573.5 (5) Å3 |
Mr = 337.74 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 16.276 (3) Å | µ = 0.27 mm−1 |
b = 7.5030 (15) Å | T = 298 K |
c = 13.812 (3) Å | 0.30 × 0.10 × 0.10 mm |
β = 111.11 (3)° |
Bruker SMART CCD area-detector diffractometer | 2824 independent reflections |
Absorption correction: ψ scan (North et al., 1968) | 1566 reflections with I > 2σ(I) |
Tmin = 0.923, Tmax = 0.973 | Rint = 0.027 |
2957 measured reflections |
R[F2 > 2σ(F2)] = 0.065 | 0 restraints |
wR(F2) = 0.170 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.99 | Δρmax = 0.26 e Å−3 |
2824 reflections | Δρmin = −0.29 e Å−3 |
213 parameters |
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 | ||
C1 | 1.0185 (2) | 0.7793 (5) | 0.9700 (2) | 0.0447 (9) | |
C2 | 1.1023 (2) | 0.7723 (5) | 1.0451 (2) | 0.0473 (9) | |
C3 | 1.1764 (2) | 0.8338 (5) | 1.0316 (3) | 0.0575 (10) | |
H3 | 1.2316 | 0.8267 | 1.0841 | 0.069* | |
C4 | 1.1653 (2) | 0.9062 (6) | 0.9370 (3) | 0.0591 (10) | |
C5 | 1.0852 (3) | 0.9180 (5) | 0.8598 (3) | 0.0614 (11) | |
H5 | 1.0799 | 0.9696 | 0.7966 | 0.074* | |
C6 | 1.0122 (2) | 0.8536 (5) | 0.8756 (3) | 0.0561 (10) | |
H6 | 0.9575 | 0.8598 | 0.8222 | 0.067* | |
C7 | 0.7054 (2) | 0.6470 (5) | 0.8669 (2) | 0.0418 (8) | |
C8 | 0.6325 (2) | 0.7235 (5) | 0.8805 (3) | 0.0534 (10) | |
H8 | 0.6377 | 0.7669 | 0.9456 | 0.064* | |
C9 | 0.5528 (2) | 0.7365 (5) | 0.7997 (3) | 0.0568 (10) | |
H9 | 0.5046 | 0.7872 | 0.8103 | 0.068* | |
C10 | 0.5451 (2) | 0.6741 (5) | 0.7036 (3) | 0.0538 (10) | |
C11 | 0.6148 (2) | 0.5949 (5) | 0.6881 (3) | 0.0567 (10) | |
H11 | 0.6087 | 0.5507 | 0.6229 | 0.068* | |
C12 | 0.6946 (2) | 0.5807 (5) | 0.7697 (2) | 0.0474 (9) | |
H12 | 0.7418 | 0.5255 | 0.7590 | 0.057* | |
C13 | 0.8638 (2) | 0.7024 (5) | 0.9292 (2) | 0.0463 (9) | |
H13 | 0.8524 | 0.7370 | 0.8610 | 0.056* | |
C14 | 0.7936 (2) | 0.6482 (5) | 0.9515 (2) | 0.0423 (8) | |
C15 | 0.8066 (2) | 0.5946 (5) | 1.0578 (2) | 0.0480 (9) | |
C16 | 0.7412 (2) | 0.4743 (6) | 1.1713 (2) | 0.0622 (11) | |
H16A | 0.7579 | 0.5751 | 1.2184 | 0.075* | |
H16B | 0.7856 | 0.3821 | 1.1972 | 0.075* | |
C17 | 0.6536 (2) | 0.4057 (6) | 1.1638 (3) | 0.0708 (12) | |
H17A | 0.6094 | 0.4936 | 1.1312 | 0.106* | |
H17B | 0.6540 | 0.3807 | 1.2321 | 0.106* | |
H17C | 0.6408 | 0.2985 | 1.1231 | 0.106* | |
Cl1 | 0.44479 (7) | 0.69755 (18) | 0.60035 (8) | 0.0887 (5) | |
F1 | 1.10991 (12) | 0.7013 (3) | 1.13887 (14) | 0.0654 (7) | |
F2 | 1.23767 (15) | 0.9700 (4) | 0.92091 (18) | 0.0856 (8) | |
N1 | 0.94818 (18) | 0.7123 (4) | 0.9939 (2) | 0.0483 (8) | |
O1 | 0.87698 (16) | 0.6036 (4) | 1.13063 (17) | 0.0660 (8) | |
O2 | 0.73408 (15) | 0.5283 (3) | 1.06790 (16) | 0.0521 (7) | |
H18 | 0.961 (2) | 0.673 (4) | 1.054 (3) | 0.050 (11)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0458 (19) | 0.047 (2) | 0.0377 (18) | 0.0000 (17) | 0.0109 (15) | −0.0070 (17) |
C2 | 0.047 (2) | 0.056 (2) | 0.0355 (18) | 0.0045 (18) | 0.0104 (15) | −0.0033 (17) |
C3 | 0.041 (2) | 0.077 (3) | 0.049 (2) | −0.006 (2) | 0.0093 (16) | −0.010 (2) |
C4 | 0.052 (2) | 0.070 (3) | 0.062 (2) | −0.007 (2) | 0.028 (2) | −0.011 (2) |
C5 | 0.070 (3) | 0.073 (3) | 0.044 (2) | −0.002 (2) | 0.024 (2) | 0.001 (2) |
C6 | 0.049 (2) | 0.073 (3) | 0.0389 (19) | −0.004 (2) | 0.0072 (16) | −0.0010 (19) |
C7 | 0.0405 (18) | 0.043 (2) | 0.0397 (18) | −0.0037 (16) | 0.0115 (14) | 0.0044 (16) |
C8 | 0.047 (2) | 0.063 (2) | 0.045 (2) | 0.0019 (19) | 0.0100 (16) | −0.0049 (19) |
C9 | 0.043 (2) | 0.062 (3) | 0.061 (2) | 0.0066 (19) | 0.0144 (18) | 0.005 (2) |
C10 | 0.045 (2) | 0.055 (2) | 0.046 (2) | −0.0034 (19) | −0.0015 (16) | 0.0091 (18) |
C11 | 0.058 (2) | 0.065 (3) | 0.0392 (19) | −0.005 (2) | 0.0082 (17) | −0.0021 (19) |
C12 | 0.0463 (19) | 0.054 (2) | 0.0399 (18) | 0.0003 (18) | 0.0130 (15) | −0.0008 (17) |
C13 | 0.047 (2) | 0.053 (2) | 0.0334 (17) | 0.0049 (18) | 0.0082 (15) | 0.0008 (16) |
C14 | 0.0426 (19) | 0.048 (2) | 0.0317 (17) | 0.0011 (17) | 0.0079 (14) | −0.0009 (15) |
C15 | 0.047 (2) | 0.052 (2) | 0.0404 (19) | −0.0026 (18) | 0.0103 (16) | −0.0019 (17) |
C16 | 0.069 (3) | 0.077 (3) | 0.0365 (19) | −0.007 (2) | 0.0138 (18) | 0.001 (2) |
C17 | 0.075 (3) | 0.081 (3) | 0.058 (2) | −0.013 (3) | 0.026 (2) | 0.000 (2) |
Cl1 | 0.0566 (7) | 0.1127 (10) | 0.0672 (7) | 0.0014 (7) | −0.0135 (5) | 0.0174 (7) |
F1 | 0.0531 (12) | 0.0978 (18) | 0.0363 (11) | −0.0016 (12) | 0.0051 (9) | 0.0110 (12) |
F2 | 0.0689 (15) | 0.119 (2) | 0.0838 (17) | −0.0253 (15) | 0.0458 (13) | −0.0121 (16) |
N1 | 0.0402 (17) | 0.063 (2) | 0.0353 (16) | −0.0006 (15) | 0.0063 (13) | 0.0050 (16) |
O1 | 0.0500 (15) | 0.099 (2) | 0.0373 (14) | −0.0152 (15) | 0.0018 (12) | 0.0058 (14) |
O2 | 0.0481 (14) | 0.0676 (17) | 0.0374 (12) | −0.0045 (13) | 0.0116 (10) | 0.0026 (12) |
C1—C2 | 1.385 (4) | C10—C11 | 1.364 (5) |
C1—C6 | 1.387 (5) | C10—Cl1 | 1.747 (3) |
C1—N1 | 1.394 (4) | C11—C12 | 1.384 (5) |
C2—F1 | 1.365 (4) | C11—H11 | 0.9300 |
C2—C3 | 1.365 (5) | C12—H12 | 0.9300 |
C3—C4 | 1.366 (5) | C13—N1 | 1.344 (4) |
C3—H3 | 0.9300 | C13—C14 | 1.348 (5) |
C4—C5 | 1.357 (5) | C13—H13 | 0.9300 |
C4—F2 | 1.362 (4) | C14—C15 | 1.463 (4) |
C5—C6 | 1.371 (5) | C15—O1 | 1.225 (4) |
C5—H5 | 0.9300 | C15—O2 | 1.333 (4) |
C6—H6 | 0.9300 | C16—O2 | 1.449 (4) |
C7—C12 | 1.383 (4) | C16—C17 | 1.484 (5) |
C7—C8 | 1.390 (5) | C16—H16A | 0.9700 |
C7—C14 | 1.489 (4) | C16—H16B | 0.9700 |
C8—C9 | 1.377 (4) | C17—H17A | 0.9600 |
C8—H8 | 0.9300 | C17—H17B | 0.9600 |
C9—C10 | 1.370 (5) | C17—H17C | 0.9600 |
C9—H9 | 0.9300 | N1—H18 | 0.83 (3) |
C2—C1—C6 | 116.0 (3) | C10—C11—H11 | 120.2 |
C2—C1—N1 | 118.7 (3) | C12—C11—H11 | 120.2 |
C6—C1—N1 | 125.3 (3) | C7—C12—C11 | 121.1 (3) |
F1—C2—C3 | 118.6 (3) | C7—C12—H12 | 119.4 |
F1—C2—C1 | 117.0 (3) | C11—C12—H12 | 119.4 |
C3—C2—C1 | 124.4 (3) | N1—C13—C14 | 127.8 (3) |
C2—C3—C4 | 116.4 (3) | N1—C13—H13 | 116.1 |
C2—C3—H3 | 121.8 | C14—C13—H13 | 116.1 |
C4—C3—H3 | 121.8 | C13—C14—C15 | 119.0 (3) |
C5—C4—F2 | 119.4 (4) | C13—C14—C7 | 118.7 (3) |
C5—C4—C3 | 122.5 (4) | C15—C14—C7 | 122.4 (3) |
F2—C4—C3 | 118.1 (4) | O1—C15—O2 | 122.4 (3) |
C4—C5—C6 | 119.6 (4) | O1—C15—C14 | 124.3 (3) |
C4—C5—H5 | 120.2 | O2—C15—C14 | 113.2 (3) |
C6—C5—H5 | 120.2 | O2—C16—C17 | 107.1 (3) |
C5—C6—C1 | 121.1 (3) | O2—C16—H16A | 110.3 |
C5—C6—H6 | 119.5 | C17—C16—H16A | 110.3 |
C1—C6—H6 | 119.5 | O2—C16—H16B | 110.3 |
C12—C7—C8 | 117.7 (3) | C17—C16—H16B | 110.3 |
C12—C7—C14 | 120.8 (3) | H16A—C16—H16B | 108.6 |
C8—C7—C14 | 121.3 (3) | C16—C17—H17A | 109.5 |
C9—C8—C7 | 121.3 (3) | C16—C17—H17B | 109.5 |
C9—C8—H8 | 119.3 | H17A—C17—H17B | 109.5 |
C7—C8—H8 | 119.3 | C16—C17—H17C | 109.5 |
C10—C9—C8 | 119.5 (4) | H17A—C17—H17C | 109.5 |
C10—C9—H9 | 120.3 | H17B—C17—H17C | 109.5 |
C8—C9—H9 | 120.3 | C13—N1—C1 | 126.4 (3) |
C11—C10—C9 | 120.7 (3) | C13—N1—H18 | 118 (2) |
C11—C10—Cl1 | 120.1 (3) | C1—N1—H18 | 116 (2) |
C9—C10—Cl1 | 119.3 (3) | C15—O2—C16 | 116.6 (3) |
C10—C11—C12 | 119.7 (3) | ||
C6—C1—C2—F1 | 179.4 (3) | C8—C7—C12—C11 | 1.9 (5) |
N1—C1—C2—F1 | −0.8 (5) | C14—C7—C12—C11 | −173.6 (3) |
C6—C1—C2—C3 | 0.4 (6) | C10—C11—C12—C7 | −0.6 (6) |
N1—C1—C2—C3 | −179.8 (4) | N1—C13—C14—C15 | 1.0 (6) |
F1—C2—C3—C4 | −179.0 (3) | N1—C13—C14—C7 | −179.7 (3) |
C1—C2—C3—C4 | −0.1 (6) | C12—C7—C14—C13 | 44.5 (5) |
C2—C3—C4—C5 | 0.3 (6) | C8—C7—C14—C13 | −130.9 (4) |
C2—C3—C4—F2 | 179.6 (3) | C12—C7—C14—C15 | −136.2 (3) |
F2—C4—C5—C6 | 179.8 (4) | C8—C7—C14—C15 | 48.4 (5) |
C3—C4—C5—C6 | −0.9 (6) | C13—C14—C15—O1 | 3.8 (6) |
C4—C5—C6—C1 | 1.2 (6) | C7—C14—C15—O1 | −175.5 (4) |
C2—C1—C6—C5 | −1.0 (5) | C13—C14—C15—O2 | −174.1 (3) |
N1—C1—C6—C5 | 179.2 (4) | C7—C14—C15—O2 | 6.5 (5) |
C12—C7—C8—C9 | −1.3 (6) | C14—C13—N1—C1 | −175.8 (4) |
C14—C7—C8—C9 | 174.2 (3) | C2—C1—N1—C13 | −177.2 (3) |
C7—C8—C9—C10 | −0.5 (6) | C6—C1—N1—C13 | 2.6 (6) |
C8—C9—C10—C11 | 1.9 (6) | O1—C15—O2—C16 | 2.9 (5) |
C8—C9—C10—Cl1 | −177.9 (3) | C14—C15—O2—C16 | −179.2 (3) |
C9—C10—C11—C12 | −1.3 (6) | C17—C16—O2—C15 | 180.0 (3) |
Cl1—C10—C11—C12 | 178.5 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H18···F1 | 0.83 (3) | 2.29 (3) | 2.674 (3) | 108 (3) |
N1—H18···O1 | 0.83 (3) | 2.07 (3) | 2.675 (4) | 129 (3) |
C6—H6···O1i | 0.93 | 2.51 | 3.321 (4) | 146 |
Symmetry code: (i) x, −y+3/2, z−1/2. |
Experimental details
Crystal data | |
Chemical formula | C17H14ClF2NO2 |
Mr | 337.74 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 298 |
a, b, c (Å) | 16.276 (3), 7.5030 (15), 13.812 (3) |
β (°) | 111.11 (3) |
V (Å3) | 1573.5 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.27 |
Crystal size (mm) | 0.30 × 0.10 × 0.10 |
Data collection | |
Diffractometer | Bruker SMART CCD area-detector |
Absorption correction | ψ scan (North et al., 1968) |
Tmin, Tmax | 0.923, 0.973 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 2957, 2824, 1566 |
Rint | 0.027 |
(sin θ/λ)max (Å−1) | 0.600 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.065, 0.170, 0.99 |
No. of reflections | 2824 |
No. of parameters | 213 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.26, −0.29 |
Computer programs: SMART (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H18···F1 | 0.83 (3) | 2.29 (3) | 2.674 (3) | 108 (3) |
N1—H18···O1 | 0.83 (3) | 2.07 (3) | 2.675 (4) | 129 (3) |
C6—H6···O1i | 0.93 | 2.51 | 3.321 (4) | 146.0 |
Symmetry code: (i) x, −y+3/2, z−1/2. |
Acknowledgements
This work was financed by the Scientific Research Fund of Hunan Provincial Education Department (Project No. 09B083) and by a grant from Jishou University for talent introduction (project No. JSDXKYZZ0801).
References
Bruker (2007). SMART and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
North, A. C. T., Phillips, D. C. & Mathews, F. S. (1968). Acta Cryst. A24, 351–359. CrossRef IUCr Journals Web of Science Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Xiao, Z.-P., Fang, R.-Q., Li, H.-Q., Xue, J.-Y., Zheng, Y. & Zhu, H.-L. (2008a). Eur. J. Med. Chem. 43, 1828–1836. Web of Science CSD CrossRef PubMed CAS Google Scholar
Xiao, Z.-P., Li, H.-Q., Shi, L., Lv, P.-C., Song, Z.-C. & Zhu, H.-L. (2008b). ChemMedChem, 3, 1077–1082. Web of Science CrossRef PubMed CAS Google Scholar
Xiao, Z.-P., Lv, P.-C., Xu, S.-P., Zhu, T.-T. & Zhu, H.-L. (2008c). ChemMedChem 3, 1516–1519. Web of Science CrossRef PubMed CAS Google Scholar
Xiao, Z.-P., Xue, J.-Y., Tan, S.-H., Li, H.-Q. & Zhu, H. L. (2007). Bioorg. Med. Chem. 15, 4212–4219. Web of Science CSD CrossRef PubMed CAS Google Scholar
You, Z.-L. & Zhu, H. L. (2006). Z. Anorg. Allg. Chem. 632, 140–146. Web of Science CSD CrossRef CAS Google Scholar
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A 2-aryl-3-arylaminoacrylate contains characteristic N—C═C bond and is therefore identified as enamine. It is well known that Schiff base harbors an N═C—C bond, which indicates that an enamine is the tautomeric isomer of the correspond Schiff base. Enamines, like Schiff bases (You & Zhu, 2006), show good antimicrobial activities (Xiao et al., 2007; Xiao et al., 2008a), especially against bacterium. On the other hand, an enamine is the key intermediate for anticancer agents, 3-arylquinolone (Xiao et al., 2008b) and 3-arylquinoline (Xiao et al., 2008c). In a continuation of our work on the structural characterization of enamine derivatives, we report herein the crystal structure of the title compound, (I).
The bond length of C13—N1 (1.344 (4) Å) is shorter than standard C—N single bond (1.48 Å) but longer than C—N double bond (1.28 Å), indicating that the p orbital of N1 is conjugated with the π molecular orbital of C13—C14 double bond. For the same reason, C1—N1 (1.394 (4) Å) is single bond with some double-bond character. The stereochemistry of the double bond in aminoacrylate moiety was assigned as (E)-configuration based on X-ray crystallography (Fig. 1) of the title compound.
Aminoacryloyloxy moiety, O2—C15—O1—C14—C13, forms a plane with the mean deviation of 0.0249 Å, which makes a dihedral angle of 47.55 (11) ° with the 4-chlorophenyl group and 8.74 (12) ° with the difluorophenyl group. The molecules are linked through intermolecular C—H···O hydrogen bonds, forming an infinite one-dimensional ribbons (Table 1, Fig. 2).