organic compounds
2-{(E)-4-[4-(Trifluoromethyl)phenoxy]but-2-enyloxy}phenyl N-methylcarbamate
aCollege of Plant Science & Technology of Huazhong Agricultural University, Wuhan 430070, People's Republic of China, and bKey Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, People's Republic of China
*Correspondence e-mail: jning502@yahoo.com.cn
In the title compound, C19H18F3NO4, which was designed and synthesized as a dual-site inhibitor of insect AChE (acetylcholinesterase), the dihedral angle between the methylcarbamate group and the benzene ring is 72.47 (6)°. In the crystal, inversion dimers are linked by pairs of N—H⋯O hydrogen bonds.
Related literature
For background to multivalent ligand-receptor interactions and their pharmaceutical applications, see: Carlier et al. (1999); Hu et al. (2002); Kitov et al. (2000); Kopytek et al. (2000); Kryger et al. (1999); Lee & Lee (1995); Luedtke et al. (2003); Mammen et al. (1998); Pang et al. (1996). For agrochemical applications of the cluster effect, see: Ma et al. (2010); Zhao et al. (2008, 2009). For the structure of AChE from Torpedo californica (TcAChe), see: Sussman et al. (1991); Harel et al. (1993).
Experimental
Crystal data
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Refinement
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Data collection: RAPID-AUTO (Rigaku 2001); cell RAPID-AUTO; data reduction: RAPID-AUTO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S1600536813001347/mw2102sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536813001347/mw2102Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536813001347/mw2102Isup3.cml
2-((E)-4-(4-(trifluoromethyl)phenoxy)but-2-enyloxy)phenyl methylcarbamate (0.2 g) was dissolved in 95% ethanol (50 ml) at room temperature. Colorless crystals of compound (I) were obtained through slow evaporation after two weeks.
The trifluoromethyl group showed orientational disorder with two resolved alternative sites which were refined independently leading to a 71:29 occupancy ratio. All non-hydrogen atoms were refined with anisotropic displacement parameters. The carbon-bound H atoms were placed at calculated positions, with C—H = 0.93 - 0.98 Å, and were included in the
in the riding model approximation with Uiso(H) set to 1.2 - 1.5Ueq(C).Data collection: RAPID-AUTO (Rigaku 2001); cell
RAPID-AUTO (Rigaku 2001); data reduction: RAPID-AUTO (Rigaku 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. The molecular structure of the title compound showing 50% probability displacement ellipsoids and the atom-numbering scheme. |
C19H18F3NO4 | F(000) = 792 |
Mr = 381.34 | Dx = 1.443 Mg m−3 |
Monoclinic, P21/c | Cu Kα radiation, λ = 1.54178 Å |
Hall symbol: -P 2ybc | Cell parameters from 468 reflections |
a = 12.413 (3) Å | θ = 2.2–68.3° |
b = 9.3936 (19) Å | µ = 1.05 mm−1 |
c = 16.202 (3) Å | T = 173 K |
β = 111.65 (3)° | Block, colorless |
V = 1755.9 (6) Å3 | 0.47 × 0.30 × 0.25 mm |
Z = 4 |
Rigaku R-AXIS RAPID IP area-detector diffractometer | 3163 independent reflections |
Radiation source: rotating anode | 2615 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.033 |
ω scans at fixed χ = 45° | θmax = 68.2°, θmin = 3.8° |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | h = −14→14 |
Tmin = 0.639, Tmax = 0.780 | k = −11→10 |
11613 measured reflections | l = −18→19 |
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)] = 0.044 | H-atom parameters constrained |
wR(F2) = 0.107 | w = 1/[σ2(Fo2) + (0.0381P)2 + 0.8611P] where P = (Fo2 + 2Fc2)/3 |
S = 1.07 | (Δ/σ)max = 0.001 |
3163 reflections | Δρmax = 0.29 e Å−3 |
274 parameters | Δρmin = −0.22 e Å−3 |
60 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0033 (3) |
C19H18F3NO4 | V = 1755.9 (6) Å3 |
Mr = 381.34 | Z = 4 |
Monoclinic, P21/c | Cu Kα radiation |
a = 12.413 (3) Å | µ = 1.05 mm−1 |
b = 9.3936 (19) Å | T = 173 K |
c = 16.202 (3) Å | 0.47 × 0.30 × 0.25 mm |
β = 111.65 (3)° |
Rigaku R-AXIS RAPID IP area-detector diffractometer | 3163 independent reflections |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | 2615 reflections with I > 2σ(I) |
Tmin = 0.639, Tmax = 0.780 | Rint = 0.033 |
11613 measured reflections |
R[F2 > 2σ(F2)] = 0.044 | 60 restraints |
wR(F2) = 0.107 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.29 e Å−3 |
3163 reflections | Δρmin = −0.22 e Å−3 |
274 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 | Occ. (<1) | |
F1 | 0.4769 (4) | −0.2372 (3) | 0.2853 (4) | 0.0698 (14) | 0.710 (12) |
F2 | 0.4529 (5) | −0.0522 (5) | 0.2121 (3) | 0.0731 (13) | 0.710 (12) |
F3 | 0.5816 (4) | −0.0554 (8) | 0.3412 (5) | 0.090 (2) | 0.710 (12) |
F1' | 0.5251 (13) | −0.2132 (15) | 0.3448 (14) | 0.109 (5) | 0.290 (12) |
F2' | 0.4491 (9) | −0.111 (2) | 0.2122 (6) | 0.111 (5) | 0.290 (12) |
F3' | 0.5655 (11) | −0.0074 (18) | 0.3219 (13) | 0.092 (5) | 0.290 (12) |
O1 | 0.13692 (11) | 0.11336 (15) | 0.41856 (9) | 0.0376 (4) | |
O2 | −0.17712 (11) | 0.32576 (15) | 0.48990 (9) | 0.0348 (3) | |
O3 | 0.02201 (12) | 0.28785 (14) | 0.67050 (9) | 0.0367 (4) | |
O4 | −0.03869 (11) | 0.50607 (14) | 0.60863 (9) | 0.0313 (3) | |
N1 | 0.12414 (13) | 0.41620 (18) | 0.60530 (11) | 0.0336 (4) | |
H1 | 0.1242 | 0.4945 | 0.5755 | 0.040* | |
C1 | 0.47480 (19) | −0.0960 (2) | 0.29620 (17) | 0.0477 (6) | |
C2 | 0.38579 (17) | −0.0443 (2) | 0.32947 (14) | 0.0360 (5) | |
C3 | 0.27526 (17) | −0.1023 (2) | 0.29649 (13) | 0.0360 (5) | |
H3 | 0.2584 | −0.1773 | 0.2543 | 0.043* | |
C4 | 0.18957 (17) | −0.0526 (2) | 0.32412 (13) | 0.0332 (5) | |
H4 | 0.1141 | −0.0930 | 0.3009 | 0.040* | |
C5 | 0.21432 (16) | 0.0570 (2) | 0.38617 (13) | 0.0318 (4) | |
C6 | 0.32588 (18) | 0.1133 (2) | 0.42067 (15) | 0.0422 (5) | |
H6 | 0.3437 | 0.1868 | 0.4640 | 0.051* | |
C7 | 0.41034 (18) | 0.0630 (2) | 0.39219 (15) | 0.0439 (5) | |
H7 | 0.4862 | 0.1022 | 0.4158 | 0.053* | |
C8 | 0.01688 (16) | 0.0769 (2) | 0.37353 (13) | 0.0354 (5) | |
H8A | 0.0055 | −0.0264 | 0.3792 | 0.043* | |
H8B | −0.0081 | 0.1005 | 0.3096 | 0.043* | |
C9 | −0.05238 (17) | 0.1595 (2) | 0.41472 (13) | 0.0329 (5) | |
H9 | −0.0182 | 0.2416 | 0.4485 | 0.039* | |
C10 | −0.15720 (18) | 0.1256 (2) | 0.40707 (14) | 0.0381 (5) | |
H10 | −0.1877 | 0.0412 | 0.3745 | 0.046* | |
C11 | −0.23549 (17) | 0.2024 (2) | 0.44281 (13) | 0.0337 (5) | |
H11A | −0.3074 | 0.2308 | 0.3935 | 0.040* | |
H11B | −0.2569 | 0.1392 | 0.4832 | 0.040* | |
C12 | −0.22437 (16) | 0.3914 (2) | 0.54436 (12) | 0.0300 (4) | |
C13 | −0.33741 (17) | 0.3764 (2) | 0.53971 (13) | 0.0354 (5) | |
H13 | −0.3893 | 0.3149 | 0.4967 | 0.042* | |
C14 | −0.37483 (18) | 0.4512 (2) | 0.59798 (14) | 0.0394 (5) | |
H14 | −0.4523 | 0.4402 | 0.5948 | 0.047* | |
C15 | −0.30069 (18) | 0.5415 (2) | 0.66040 (14) | 0.0392 (5) | |
H15 | −0.3271 | 0.5922 | 0.7001 | 0.047* | |
C16 | −0.18725 (17) | 0.5581 (2) | 0.66513 (13) | 0.0347 (5) | |
H16 | −0.1360 | 0.6209 | 0.7076 | 0.042* | |
C17 | −0.14992 (16) | 0.4832 (2) | 0.60820 (12) | 0.0296 (4) | |
C18 | 0.03597 (16) | 0.3915 (2) | 0.63119 (12) | 0.0290 (4) | |
C19 | 0.22029 (18) | 0.3175 (2) | 0.62487 (16) | 0.0446 (6) | |
H19A | 0.2818 | 0.3611 | 0.6091 | 0.067* | |
H19B | 0.1936 | 0.2300 | 0.5904 | 0.067* | |
H19C | 0.2504 | 0.2947 | 0.6884 | 0.067* |
U11 | U22 | U33 | U12 | U13 | U23 | |
F1 | 0.082 (2) | 0.0421 (13) | 0.117 (3) | 0.0125 (13) | 0.073 (2) | 0.0034 (16) |
F2 | 0.084 (3) | 0.083 (2) | 0.077 (2) | 0.0261 (19) | 0.059 (2) | 0.019 (2) |
F3 | 0.0276 (13) | 0.136 (5) | 0.100 (3) | −0.001 (2) | 0.0170 (15) | −0.051 (3) |
F1' | 0.099 (7) | 0.091 (7) | 0.172 (12) | 0.058 (6) | 0.092 (8) | 0.046 (7) |
F2' | 0.038 (4) | 0.192 (13) | 0.093 (7) | −0.003 (6) | 0.011 (4) | −0.102 (8) |
F3' | 0.065 (7) | 0.090 (7) | 0.159 (11) | −0.039 (6) | 0.087 (8) | −0.045 (7) |
O1 | 0.0312 (7) | 0.0435 (8) | 0.0390 (8) | −0.0012 (6) | 0.0141 (6) | −0.0093 (7) |
O2 | 0.0333 (7) | 0.0358 (8) | 0.0412 (8) | −0.0074 (6) | 0.0207 (6) | −0.0109 (6) |
O3 | 0.0369 (8) | 0.0314 (8) | 0.0423 (8) | 0.0002 (6) | 0.0151 (6) | 0.0082 (6) |
O4 | 0.0279 (7) | 0.0274 (7) | 0.0399 (7) | 0.0004 (6) | 0.0139 (6) | 0.0013 (6) |
N1 | 0.0307 (8) | 0.0351 (9) | 0.0369 (9) | 0.0017 (7) | 0.0148 (7) | 0.0039 (8) |
C1 | 0.0362 (12) | 0.0442 (13) | 0.0672 (16) | 0.0019 (11) | 0.0243 (11) | 0.0044 (13) |
C2 | 0.0302 (10) | 0.0354 (11) | 0.0437 (11) | 0.0024 (9) | 0.0151 (9) | 0.0051 (9) |
C3 | 0.0347 (10) | 0.0354 (11) | 0.0385 (11) | −0.0001 (9) | 0.0141 (9) | −0.0032 (9) |
C4 | 0.0300 (10) | 0.0346 (11) | 0.0344 (10) | −0.0010 (8) | 0.0111 (8) | −0.0010 (9) |
C5 | 0.0302 (10) | 0.0330 (10) | 0.0327 (10) | 0.0027 (8) | 0.0121 (8) | 0.0035 (8) |
C6 | 0.0342 (11) | 0.0405 (12) | 0.0489 (12) | −0.0047 (10) | 0.0118 (9) | −0.0112 (10) |
C7 | 0.0285 (10) | 0.0434 (12) | 0.0573 (14) | −0.0043 (9) | 0.0130 (10) | −0.0055 (11) |
C8 | 0.0313 (10) | 0.0384 (11) | 0.0380 (11) | −0.0031 (9) | 0.0145 (9) | −0.0050 (9) |
C9 | 0.0347 (10) | 0.0314 (10) | 0.0335 (10) | −0.0015 (9) | 0.0137 (8) | −0.0049 (8) |
C10 | 0.0408 (11) | 0.0331 (11) | 0.0439 (12) | −0.0048 (9) | 0.0200 (9) | −0.0095 (9) |
C11 | 0.0334 (10) | 0.0322 (10) | 0.0367 (11) | −0.0048 (8) | 0.0142 (8) | −0.0041 (8) |
C12 | 0.0303 (10) | 0.0313 (10) | 0.0315 (10) | 0.0019 (8) | 0.0147 (8) | 0.0007 (8) |
C13 | 0.0297 (10) | 0.0400 (12) | 0.0382 (11) | −0.0026 (9) | 0.0145 (9) | −0.0030 (9) |
C14 | 0.0315 (10) | 0.0457 (13) | 0.0463 (12) | 0.0046 (9) | 0.0205 (9) | 0.0035 (10) |
C15 | 0.0408 (12) | 0.0441 (12) | 0.0378 (11) | 0.0078 (10) | 0.0206 (10) | 0.0003 (10) |
C16 | 0.0379 (11) | 0.0333 (11) | 0.0325 (10) | 0.0025 (9) | 0.0125 (9) | −0.0001 (9) |
C17 | 0.0279 (9) | 0.0291 (10) | 0.0331 (10) | 0.0013 (8) | 0.0129 (8) | 0.0029 (8) |
C18 | 0.0271 (9) | 0.0294 (10) | 0.0284 (9) | −0.0008 (8) | 0.0077 (8) | −0.0031 (8) |
C19 | 0.0319 (11) | 0.0475 (13) | 0.0549 (13) | 0.0068 (10) | 0.0168 (10) | 0.0000 (11) |
F1—C1 | 1.339 (3) | C6—H6 | 0.9500 |
F2—C1 | 1.351 (4) | C7—H7 | 0.9500 |
F3—C1 | 1.312 (5) | C8—C9 | 1.487 (3) |
F1'—C1 | 1.363 (7) | C8—H8A | 0.9900 |
F2'—C1 | 1.287 (8) | C8—H8B | 0.9900 |
F3'—C1 | 1.337 (9) | C9—C10 | 1.300 (3) |
O1—C5 | 1.361 (2) | C9—H9 | 0.9500 |
O1—C8 | 1.438 (2) | C10—C11 | 1.488 (3) |
O2—C12 | 1.373 (2) | C10—H10 | 0.9500 |
O2—C11 | 1.429 (2) | C11—H11A | 0.9900 |
O3—C18 | 1.210 (2) | C11—H11B | 0.9900 |
O4—C18 | 1.379 (2) | C12—C13 | 1.384 (3) |
O4—C17 | 1.395 (2) | C12—C17 | 1.401 (3) |
N1—C18 | 1.329 (2) | C13—C14 | 1.387 (3) |
N1—C19 | 1.451 (3) | C13—H13 | 0.9500 |
N1—H1 | 0.8800 | C14—C15 | 1.379 (3) |
C1—C2 | 1.479 (3) | C14—H14 | 0.9500 |
C2—C7 | 1.383 (3) | C15—C16 | 1.390 (3) |
C2—C3 | 1.387 (3) | C15—H15 | 0.9500 |
C3—C4 | 1.379 (3) | C16—C17 | 1.369 (3) |
C3—H3 | 0.9500 | C16—H16 | 0.9500 |
C4—C5 | 1.392 (3) | C19—H19A | 0.9800 |
C4—H4 | 0.9500 | C19—H19B | 0.9800 |
C5—C6 | 1.393 (3) | C19—H19C | 0.9800 |
C6—C7 | 1.376 (3) | ||
C5—O1—C8 | 117.30 (15) | H8A—C8—H8B | 108.4 |
C12—O2—C11 | 117.06 (15) | C10—C9—C8 | 123.63 (19) |
C18—O4—C17 | 116.65 (14) | C10—C9—H9 | 118.2 |
C18—N1—C19 | 121.73 (18) | C8—C9—H9 | 118.2 |
C18—N1—H1 | 119.1 | C9—C10—C11 | 128.22 (19) |
C19—N1—H1 | 119.1 | C9—C10—H10 | 115.9 |
F2'—C1—F3' | 104.5 (10) | C11—C10—H10 | 115.9 |
F3—C1—F1 | 107.3 (4) | O2—C11—C10 | 108.98 (16) |
F3—C1—F2 | 104.9 (4) | O2—C11—H11A | 109.9 |
F1—C1—F2 | 100.1 (3) | C10—C11—H11A | 109.9 |
F2'—C1—F1' | 113.7 (8) | O2—C11—H11B | 109.9 |
F3'—C1—F1' | 99.7 (8) | C10—C11—H11B | 109.9 |
F2'—C1—C2 | 119.7 (6) | H11A—C11—H11B | 108.3 |
F3—C1—C2 | 116.1 (4) | O2—C12—C13 | 125.72 (17) |
F3'—C1—C2 | 109.8 (7) | O2—C12—C17 | 115.42 (16) |
F1—C1—C2 | 115.2 (2) | C13—C12—C17 | 118.84 (18) |
F2—C1—C2 | 111.6 (3) | C12—C13—C14 | 119.89 (19) |
F1'—C1—C2 | 107.4 (5) | C12—C13—H13 | 120.1 |
C7—C2—C3 | 119.2 (2) | C14—C13—H13 | 120.1 |
C7—C2—C1 | 121.03 (19) | C15—C14—C13 | 120.68 (19) |
C3—C2—C1 | 119.8 (2) | C15—C14—H14 | 119.7 |
C4—C3—C2 | 120.9 (2) | C13—C14—H14 | 119.7 |
C4—C3—H3 | 119.5 | C14—C15—C16 | 119.8 (2) |
C2—C3—H3 | 119.5 | C14—C15—H15 | 120.1 |
C3—C4—C5 | 119.58 (19) | C16—C15—H15 | 120.1 |
C3—C4—H4 | 120.2 | C17—C16—C15 | 119.53 (19) |
C5—C4—H4 | 120.2 | C17—C16—H16 | 120.2 |
O1—C5—C4 | 124.58 (18) | C15—C16—H16 | 120.2 |
O1—C5—C6 | 115.86 (18) | C16—C17—O4 | 119.88 (17) |
C4—C5—C6 | 119.54 (19) | C16—C17—C12 | 121.22 (18) |
C7—C6—C5 | 120.2 (2) | O4—C17—C12 | 118.71 (17) |
C7—C6—H6 | 119.9 | O3—C18—N1 | 126.96 (18) |
C5—C6—H6 | 119.9 | O3—C18—O4 | 123.69 (17) |
C6—C7—C2 | 120.6 (2) | N1—C18—O4 | 109.33 (16) |
C6—C7—H7 | 119.7 | N1—C19—H19A | 109.5 |
C2—C7—H7 | 119.7 | N1—C19—H19B | 109.5 |
O1—C8—C9 | 108.10 (16) | H19A—C19—H19B | 109.5 |
O1—C8—H8A | 110.1 | N1—C19—H19C | 109.5 |
C9—C8—H8A | 110.1 | H19A—C19—H19C | 109.5 |
O1—C8—H8B | 110.1 | H19B—C19—H19C | 109.5 |
C9—C8—H8B | 110.1 | ||
F2'—C1—C2—C7 | −132.8 (10) | C5—O1—C8—C9 | −175.09 (16) |
F3—C1—C2—C7 | 12.8 (5) | O1—C8—C9—C10 | −160.9 (2) |
F3'—C1—C2—C7 | −11.9 (10) | C8—C9—C10—C11 | −177.9 (2) |
F1—C1—C2—C7 | 139.4 (4) | C12—O2—C11—C10 | −165.39 (16) |
F2—C1—C2—C7 | −107.3 (3) | C9—C10—C11—O2 | −0.2 (3) |
F1'—C1—C2—C7 | 95.6 (11) | C11—O2—C12—C13 | −19.5 (3) |
F2'—C1—C2—C3 | 46.2 (10) | C11—O2—C12—C17 | 161.91 (17) |
F3—C1—C2—C3 | −168.2 (4) | O2—C12—C13—C14 | −178.79 (18) |
F3'—C1—C2—C3 | 167.0 (10) | C17—C12—C13—C14 | −0.2 (3) |
F1—C1—C2—C3 | −41.6 (4) | C12—C13—C14—C15 | 0.4 (3) |
F2—C1—C2—C3 | 71.7 (3) | C13—C14—C15—C16 | 0.1 (3) |
F1'—C1—C2—C3 | −85.4 (11) | C14—C15—C16—C17 | −0.7 (3) |
C7—C2—C3—C4 | 1.2 (3) | C15—C16—C17—O4 | 175.88 (17) |
C1—C2—C3—C4 | −177.75 (19) | C15—C16—C17—C12 | 0.8 (3) |
C2—C3—C4—C5 | −0.2 (3) | C18—O4—C17—C16 | 117.69 (19) |
C8—O1—C5—C4 | −12.6 (3) | C18—O4—C17—C12 | −67.1 (2) |
C8—O1—C5—C6 | 169.01 (18) | O2—C12—C17—C16 | 178.33 (17) |
C3—C4—C5—O1 | −179.48 (18) | C13—C12—C17—C16 | −0.4 (3) |
C3—C4—C5—C6 | −1.1 (3) | O2—C12—C17—O4 | 3.2 (3) |
O1—C5—C6—C7 | 179.85 (19) | C13—C12—C17—O4 | −175.48 (17) |
C4—C5—C6—C7 | 1.3 (3) | C19—N1—C18—O3 | −1.9 (3) |
C5—C6—C7—C2 | −0.3 (3) | C19—N1—C18—O4 | 176.30 (17) |
C3—C2—C7—C6 | −1.0 (3) | C17—O4—C18—O3 | −18.9 (3) |
C1—C2—C7—C6 | 178.0 (2) | C17—O4—C18—N1 | 162.82 (15) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O2i | 0.88 | 2.22 | 3.072 (2) | 163 |
Symmetry code: (i) −x, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C19H18F3NO4 |
Mr | 381.34 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 173 |
a, b, c (Å) | 12.413 (3), 9.3936 (19), 16.202 (3) |
β (°) | 111.65 (3) |
V (Å3) | 1755.9 (6) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 1.05 |
Crystal size (mm) | 0.47 × 0.30 × 0.25 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID IP area-detector diffractometer |
Absorption correction | Multi-scan (ABSCOR; Higashi, 1995) |
Tmin, Tmax | 0.639, 0.780 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11613, 3163, 2615 |
Rint | 0.033 |
(sin θ/λ)max (Å−1) | 0.602 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.107, 1.07 |
No. of reflections | 3163 |
No. of parameters | 274 |
No. of restraints | 60 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.29, −0.22 |
Computer programs: RAPID-AUTO (Rigaku 2001), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), XP in SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O2i | 0.88 | 2.22 | 3.072 (2) | 163 |
Symmetry code: (i) −x, −y+1, −z+1. |
Acknowledgements
This work was partially supported by the National Natural Science Foundation of China (program No. 31201554), the China Postdoctoral Science Foundation (program No. 20110491174) and the Fundamental Research Funds for the Central Universities (program No. 2011QC086).
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Multivalent ligand-receptor interactions, known as the cluster effect, are defined as specific simultaneous associations of multiple ligands present on a molecular construct that bind to multiple receptors presented on a biological entity (Mammen et al., 1998; Lee et al., 1995). In biological systems, multivalent ligands often possess increased functional affinity for their targets compared with that of monovalent ligands (Kitov et al., 2000; Kopytek et al., 2000; Luedtke et al., 2003). Acetylcholinesterase (AChE; EC 3.1.1.7) is a key enzyme in the nervous system, terminating nerve impulses by catalyzing the hydrolysis of the neurotransmitter acetylcholine. X-ray crystallographic structural analysis of the AChE from Torpedo californica (TcAChe) has demonstrated that the active site lies near the bottom of a deep, narrow gorge that reaches half way into the protein and that 14 aromatic residues line a substantial portion of the surface of the gorge (Sussman et al., 1991). This cavity was named the 'active site gorge' with peripheral sites existing at the gorge mouth and Trp279 being the main site (Harel et al., 1993). On the basis of the structure of AChE, many potential dual-site binding inhibitors of AChE have been synthesized (Pang et al., 1996; Carlier et al., 1999; Hu et al., 2002) and demonstrated in drugs in order to treat or alleviate Alzheimer's disease (Kryger et al., 1999). In the area of pesticide, dual- or multiple-site inhibitors of insect AChE were designed and synthesized in our research group (Zhao et al.., 2008; Zhao et al., 2009). Recently, we synthesized novel carbamate derivatives as potential dual-binding site acetylcholinesterase inhibitors (Ma et al., 2010). The crystal structure of the title compound (I) is shown in Fig. 1.