organic compounds
(E)-2-{1-[(6-Chloropyridin-3-yl)methyl]imidazolidin-2-ylidene}-2-cyano-N-(2-methylphenyl)acetamide
aCenter for Research and Development of Fine Chemicals, Guizhou University, Guiyang, 550025 Guizhou, People's Republic of China
*Correspondence e-mail: jianwu2691@yahoo.com.cn
In the title compound, C19H18N5O, the imidazolidine ring makes dihedral angles of 87.62 (17) and 28.27 (11)° with the pyridine and benzene rings, respectively. An intramolecular N—H⋯O hydrogen bond is observed between the carbonyl O atom and an imidazolidine H atom. In the crystal, an intermolecular N—H⋯N hydrogen bond gives rise to a linear chain running along the b axis.
Related literature
For background to neonicotinoids and their biological activity, see: Shao et al. (2008); Nishimura et al. (1994); Mori et al. (2002); Ohno et al. (2009); Tomizawa et al. (2000); Wu et al. (2011).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2002); cell SAINT (Bruker, 2002); 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 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
https://doi.org/10.1107/S1600536811037524/ng5220sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811037524/ng5220Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811037524/ng5220Isup3.cdx
Supporting information file. DOI: https://doi.org/10.1107/S1600536811037524/ng5220Isup4.cml
A mixture of 2-cyano-3,3-bis(methylthio)-N-(o-tolyl)acrylamide (1 mmol) and N-((6-chloropyridin-3-yl) methyl) ethane-1,2-diamine (1 mmol) was stirred in refluxing ethanol (10 ml). The progress of the reaction was monitored by TLC. After the completion of the reaction, the mixture was cooled to room temperature, block-shaped crystals were formed, which was filtered off, washed with ethanol and dried in the air.
All H atoms were placed in calculated positions and refined as riding on the parent C atoms with C—H = 0.93–0.97 Å, N—H = 0.86 Å, and Uiso(H) = 1.2 Ueq (C, N).
Neonicotinoids, an interesting class of insecticide known to act on the central nervous system of insects, are widely used in agriculture due to their broad spectrum activity and low mammalian toxicity. As a part of our ongoing investigation of neonicotinoids analogs, we presented a series of neonicotinoid analogs bearing amide moieties that exhibit good activity against Nilaparvata lugens at 100 mg/L (Wu et al., 2011). However,the accurate configuration of the active compound in our previous work has not been reported. Herein, we report the
of the title compound, (E)-2-(1-((6-chloropyridin-3-yl)methyl)imidazolidin-2-ylidene)-2- cyano-N-(o-tolyl)acetamide. It is noteworthy that the crystal of neonicotinoid analog bearing an amide moiety was obtained for the first time.In the molecule of the title compound (Fig. 1), the imidazoline ring makes dihedral angles of 87.62 (17) ° with pyridine ring and 28.27 (11) ° with benzene ring. An intramolecular N—H···O hydrogen bond is observed between the O atom of carbonyl and imidazoline H atom; The ststructure possesses an intramolecular N3—H3A···O1 hydrogen bond with N3—H3A = 0.86 Å, H3A—O1 = 2.0661 Å, N3—O1 = 2.659 (2) Å, and N—H···O = 125.44 °. In the π interactions between neighboring molecules, which with the length for bonds N3—H3A, H3A—N4, H3A—N4 were 0.86 Å, 2.4883 Å, 3.044 (3) Å and the angles for N—H···N, C8—H8B···Cg(2)ii were 123.03 ° and 113.20 °, respectively; Furthermore, the length for H8B···Cg(2)ii and C8···Cg(2)ii were 3.1386 Å and 3.632 (3) Å, the angle of C19—H12A···Cg(3)iii is 130.96 °; In addition, the length of H12A···Cg(3)iii and C19···Cg(3)iii were 3.0384 Å and 3.827 (3) Å, respectively [symmetry codes: (i) x,-1 + y,z, (ii) x,-1 + y,z, (iii) x,1 - y,1 - z].
there are N3—H3A···N4i hydrogen bonds and C—H···For background to neonicotinoids and their biological activity, see: Shao et al. (2008); Nishimura et al. (1994); Mori et al. (2002); Ohno et al. (2009); Tomizawa et al. (2000); Wu et al. (2011).
Data collection: APEX2 (Bruker, 2002); cell
SAINT (Bruker, 2002); data reduction: SAINT (Bruker, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).Fig. 1. The molecular structure of (I), with displacement ellipsoids drawn at the 30% probability level. |
C19H18ClN5O | F(000) = 768 |
Mr = 367.83 | Dx = 1.352 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 19209 reflections |
a = 16.2019 (18) Å | θ = 1.3–26.0° |
b = 7.6240 (9) Å | µ = 0.23 mm−1 |
c = 14.7368 (18) Å | T = 293 K |
β = 97.007 (3)° | Prism, colourless |
V = 1806.7 (4) Å3 | 0.26 × 0.23 × 0.21 mm |
Z = 4 |
Bruker APEXII CCD area-detector diffractometer | 3512 independent reflections |
Radiation source: fine-focus sealed tube | 2618 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.060 |
φ and ω scans | θmax = 26.0°, θmin = 1.3° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1997) | h = −19→19 |
Tmin = 0.943, Tmax = 0.953 | k = −9→9 |
19209 measured reflections | l = −18→17 |
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 = 1.03 | w = 1/[σ2(Fo2) + (0.0717P)2 + 0.3718P] where P = (Fo2 + 2Fc2)/3 |
3512 reflections | (Δ/σ)max = 0.001 |
238 parameters | Δρmax = 0.22 e Å−3 |
0 restraints | Δρmin = −0.28 e Å−3 |
C19H18ClN5O | V = 1806.7 (4) Å3 |
Mr = 367.83 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 16.2019 (18) Å | µ = 0.23 mm−1 |
b = 7.6240 (9) Å | T = 293 K |
c = 14.7368 (18) Å | 0.26 × 0.23 × 0.21 mm |
β = 97.007 (3)° |
Bruker APEXII CCD area-detector diffractometer | 3512 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1997) | 2618 reflections with I > 2σ(I) |
Tmin = 0.943, Tmax = 0.953 | Rint = 0.060 |
19209 measured reflections |
R[F2 > 2σ(F2)] = 0.049 | 0 restraints |
wR(F2) = 0.139 | H-atom parameters constrained |
S = 1.03 | Δρmax = 0.22 e Å−3 |
3512 reflections | Δρmin = −0.28 e Å−3 |
238 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 | 0.48863 (12) | −0.2075 (2) | −0.41527 (13) | 0.0530 (5) | |
C2 | 0.42330 (13) | −0.1992 (3) | −0.48356 (13) | 0.0598 (5) | |
H2 | 0.4244 | −0.2600 | −0.5381 | 0.072* | |
C3 | 0.35610 (13) | −0.0979 (3) | −0.46850 (13) | 0.0552 (5) | |
H3 | 0.3105 | −0.0890 | −0.5132 | 0.066* | |
C4 | 0.35663 (11) | −0.0093 (2) | −0.38658 (12) | 0.0477 (4) | |
C5 | 0.42631 (13) | −0.0274 (3) | −0.32411 (14) | 0.0623 (6) | |
H5 | 0.4278 | 0.0335 | −0.2693 | 0.075* | |
C6 | 0.28226 (13) | 0.0973 (3) | −0.36788 (15) | 0.0641 (6) | |
H6A | 0.2542 | 0.1407 | −0.4254 | 0.077* | |
H6B | 0.2437 | 0.0219 | −0.3407 | 0.077* | |
N2 | 0.30409 (10) | 0.2454 (2) | −0.30700 (11) | 0.0570 (4) | |
C8 | 0.32548 (15) | 0.5482 (3) | −0.28080 (15) | 0.0673 (6) | |
H8A | 0.3771 | 0.5860 | −0.2461 | 0.081* | |
H8B | 0.2989 | 0.6479 | −0.3132 | 0.081* | |
C9 | 0.26236 (11) | 0.2939 (2) | −0.23634 (12) | 0.0497 (5) | |
C10 | 0.22032 (12) | 0.1820 (2) | −0.18154 (13) | 0.0506 (5) | |
C11 | 0.23108 (16) | −0.0018 (3) | −0.18395 (18) | 0.0735 (6) | |
C12 | 0.17737 (11) | 0.2533 (2) | −0.10901 (12) | 0.0479 (4) | |
H12B | 0.1949 | −0.1608 | 0.0393 | 0.108 (10)* | |
H12C | 0.1391 | −0.2427 | 0.1011 | 0.117 (11)* | |
H12A | 0.1041 | −0.2307 | −0.0043 | 0.133 (11)* | |
C13 | 0.10396 (11) | 0.1528 (3) | 0.02201 (14) | 0.0540 (5) | |
C14 | 0.07069 (13) | 0.3118 (3) | 0.04596 (15) | 0.0631 (6) | |
H14 | 0.0718 | 0.4087 | 0.0078 | 0.076* | |
C15 | 0.03602 (16) | 0.3252 (4) | 0.12656 (17) | 0.0790 (7) | |
H15 | 0.0133 | 0.4313 | 0.1424 | 0.095* | |
C16 | 0.03473 (18) | 0.1828 (4) | 0.18372 (18) | 0.0889 (8) | |
H16 | 0.0118 | 0.1928 | 0.2384 | 0.107* | |
C17 | 0.06735 (16) | 0.0262 (4) | 0.15965 (18) | 0.0836 (7) | |
H17 | 0.0658 | −0.0694 | 0.1986 | 0.100* | |
C18 | 0.10247 (13) | 0.0055 (3) | 0.07951 (16) | 0.0652 (6) | |
C19 | 0.13699 (18) | −0.1683 (3) | 0.0544 (2) | 0.0883 (8) | |
N1 | 0.49193 (11) | −0.1261 (2) | −0.33656 (12) | 0.0644 (5) | |
C7 | 0.33994 (16) | 0.4000 (3) | −0.34602 (16) | 0.0731 (7) | |
H7A | 0.3124 | 0.4240 | −0.4069 | 0.088* | |
H7B | 0.3989 | 0.3835 | −0.3493 | 0.088* | |
N3 | 0.27094 (11) | 0.4658 (2) | −0.22247 (11) | 0.0592 (4) | |
H3A | 0.2465 | 0.5223 | −0.1828 | 0.071* | |
N4 | 0.2387 (2) | −0.1517 (3) | −0.1790 (2) | 0.1184 (10) | |
N5 | 0.13992 (11) | 0.1309 (2) | −0.05957 (12) | 0.0611 (5) | |
H5A | 0.1381 | 0.0262 | −0.0814 | 0.073* | |
O1 | 0.17555 (9) | 0.41125 (17) | −0.09060 (9) | 0.0620 (4) | |
Cl1 | 0.57548 (4) | −0.33450 (9) | −0.43072 (4) | 0.0805 (2) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0587 (11) | 0.0458 (10) | 0.0560 (11) | 0.0075 (8) | 0.0131 (9) | −0.0006 (9) |
C2 | 0.0789 (13) | 0.0558 (12) | 0.0450 (11) | 0.0146 (10) | 0.0080 (9) | −0.0111 (9) |
C3 | 0.0672 (12) | 0.0540 (11) | 0.0427 (10) | 0.0125 (9) | −0.0005 (8) | −0.0057 (8) |
C4 | 0.0561 (10) | 0.0442 (10) | 0.0431 (10) | 0.0042 (8) | 0.0076 (8) | −0.0042 (8) |
C5 | 0.0650 (12) | 0.0714 (14) | 0.0496 (11) | 0.0127 (10) | 0.0032 (9) | −0.0184 (10) |
C6 | 0.0623 (12) | 0.0744 (14) | 0.0548 (12) | 0.0141 (10) | 0.0040 (9) | −0.0206 (10) |
N2 | 0.0692 (10) | 0.0508 (10) | 0.0532 (9) | 0.0108 (8) | 0.0160 (8) | −0.0081 (8) |
C8 | 0.0861 (15) | 0.0555 (12) | 0.0639 (13) | 0.0111 (11) | 0.0236 (11) | 0.0056 (10) |
C9 | 0.0564 (10) | 0.0471 (11) | 0.0452 (10) | 0.0146 (8) | 0.0046 (8) | −0.0048 (8) |
C10 | 0.0572 (11) | 0.0408 (10) | 0.0540 (11) | 0.0068 (8) | 0.0072 (8) | −0.0082 (8) |
C11 | 0.0889 (16) | 0.0509 (14) | 0.0875 (16) | 0.0048 (11) | 0.0375 (13) | −0.0124 (11) |
C12 | 0.0520 (10) | 0.0436 (10) | 0.0473 (10) | 0.0052 (8) | 0.0027 (8) | −0.0048 (8) |
C13 | 0.0453 (10) | 0.0568 (12) | 0.0600 (12) | −0.0044 (8) | 0.0067 (8) | −0.0024 (9) |
C14 | 0.0614 (12) | 0.0642 (14) | 0.0654 (13) | 0.0096 (10) | 0.0145 (10) | 0.0006 (10) |
C15 | 0.0834 (16) | 0.0865 (18) | 0.0714 (15) | 0.0118 (13) | 0.0267 (13) | −0.0074 (13) |
C16 | 0.0936 (19) | 0.108 (2) | 0.0700 (16) | 0.0016 (16) | 0.0287 (14) | 0.0055 (16) |
C17 | 0.0858 (17) | 0.0905 (19) | 0.0765 (17) | −0.0106 (14) | 0.0182 (14) | 0.0223 (14) |
C18 | 0.0568 (11) | 0.0588 (13) | 0.0791 (15) | −0.0077 (10) | 0.0051 (11) | 0.0058 (11) |
C19 | 0.0933 (19) | 0.0552 (15) | 0.117 (2) | −0.0042 (13) | 0.0150 (16) | 0.0151 (15) |
N1 | 0.0613 (10) | 0.0739 (12) | 0.0561 (10) | 0.0134 (9) | −0.0004 (8) | −0.0134 (9) |
C7 | 0.0949 (17) | 0.0642 (14) | 0.0654 (14) | 0.0189 (12) | 0.0303 (12) | 0.0051 (11) |
N3 | 0.0820 (11) | 0.0422 (9) | 0.0569 (10) | 0.0107 (8) | 0.0229 (8) | −0.0018 (7) |
N4 | 0.178 (3) | 0.0454 (13) | 0.150 (2) | 0.0096 (14) | 0.092 (2) | −0.0105 (13) |
N5 | 0.0693 (11) | 0.0447 (9) | 0.0724 (12) | −0.0027 (8) | 0.0210 (9) | −0.0106 (8) |
O1 | 0.0873 (10) | 0.0426 (8) | 0.0596 (9) | 0.0034 (7) | 0.0229 (7) | −0.0087 (6) |
Cl1 | 0.0730 (4) | 0.0846 (5) | 0.0850 (5) | 0.0292 (3) | 0.0141 (3) | −0.0110 (3) |
C1—N1 | 1.311 (3) | C10—C12 | 1.450 (3) |
C1—C2 | 1.370 (3) | C11—N4 | 1.151 (3) |
C1—Cl1 | 1.7458 (19) | C12—O1 | 1.236 (2) |
C2—C3 | 1.375 (3) | C12—N5 | 1.370 (3) |
C2—H2 | 0.9300 | C13—C14 | 1.390 (3) |
C3—C4 | 1.383 (3) | C13—N5 | 1.408 (3) |
C3—H3 | 0.9300 | C13—C18 | 1.408 (3) |
C4—C5 | 1.374 (3) | C14—C15 | 1.378 (3) |
C4—C6 | 1.506 (3) | C14—H14 | 0.9300 |
C5—N1 | 1.334 (3) | C15—C16 | 1.376 (4) |
C5—H5 | 0.9300 | C15—H15 | 0.9300 |
C6—N2 | 1.459 (3) | C16—C17 | 1.370 (4) |
C6—H6A | 0.9700 | C16—H16 | 0.9300 |
C6—H6B | 0.9700 | C17—C18 | 1.381 (4) |
N2—C9 | 1.360 (2) | C17—H17 | 0.9300 |
N2—C7 | 1.462 (3) | C18—C19 | 1.502 (4) |
C8—N3 | 1.449 (3) | C19—H12B | 0.9917 |
C8—C7 | 1.520 (3) | C19—H12C | 0.8887 |
C8—H8A | 0.9700 | C19—H12A | 1.0711 |
C8—H8B | 0.9700 | C7—H7A | 0.9700 |
C9—N3 | 1.331 (2) | C7—H7B | 0.9700 |
C9—C10 | 1.407 (3) | N3—H3A | 0.8600 |
C10—C11 | 1.413 (3) | N5—H5A | 0.8600 |
N1—C1—C2 | 124.94 (18) | N5—C12—C10 | 114.85 (16) |
N1—C1—Cl1 | 115.56 (15) | C14—C13—N5 | 122.25 (19) |
C2—C1—Cl1 | 119.50 (15) | C14—C13—C18 | 120.5 (2) |
C1—C2—C3 | 117.60 (18) | N5—C13—C18 | 117.29 (19) |
C1—C2—H2 | 121.2 | C15—C14—C13 | 119.7 (2) |
C3—C2—H2 | 121.2 | C15—C14—H14 | 120.2 |
C2—C3—C4 | 119.67 (18) | C13—C14—H14 | 120.2 |
C2—C3—H3 | 120.2 | C16—C15—C14 | 120.5 (2) |
C4—C3—H3 | 120.2 | C16—C15—H15 | 119.8 |
C5—C4—C3 | 116.93 (17) | C14—C15—H15 | 119.8 |
C5—C4—C6 | 122.82 (17) | C17—C16—C15 | 119.6 (2) |
C3—C4—C6 | 120.23 (17) | C17—C16—H16 | 120.2 |
N1—C5—C4 | 124.64 (18) | C15—C16—H16 | 120.2 |
N1—C5—H5 | 117.7 | C16—C17—C18 | 122.2 (2) |
C4—C5—H5 | 117.7 | C16—C17—H17 | 118.9 |
N2—C6—C4 | 113.00 (17) | C18—C17—H17 | 118.9 |
N2—C6—H6A | 109.0 | C17—C18—C13 | 117.6 (2) |
C4—C6—H6A | 109.0 | C17—C18—C19 | 121.1 (2) |
N2—C6—H6B | 109.0 | C13—C18—C19 | 121.4 (2) |
C4—C6—H6B | 109.0 | C18—C19—H12B | 113.3 |
H6A—C6—H6B | 107.8 | C18—C19—H12C | 110.6 |
C9—N2—C6 | 125.12 (18) | H12B—C19—H12C | 105.3 |
C9—N2—C7 | 109.92 (16) | C18—C19—H12A | 115.3 |
C6—N2—C7 | 117.40 (17) | H12B—C19—H12A | 103.6 |
N3—C8—C7 | 101.83 (18) | H12C—C19—H12A | 108.1 |
N3—C8—H8A | 111.4 | C1—N1—C5 | 116.21 (17) |
C7—C8—H8A | 111.4 | N2—C7—C8 | 104.54 (17) |
N3—C8—H8B | 111.4 | N2—C7—H7A | 110.8 |
C7—C8—H8B | 111.4 | C8—C7—H7A | 110.8 |
H8A—C8—H8B | 109.3 | N2—C7—H7B | 110.8 |
N3—C9—N2 | 109.43 (17) | C8—C7—H7B | 110.8 |
N3—C9—C10 | 123.91 (16) | H7A—C7—H7B | 108.9 |
N2—C9—C10 | 126.56 (17) | C9—N3—C8 | 113.30 (16) |
C9—C10—C11 | 121.14 (18) | C9—N3—H3A | 123.3 |
C9—C10—C12 | 120.36 (16) | C8—N3—H3A | 123.3 |
C11—C10—C12 | 117.51 (19) | C12—N5—C13 | 129.02 (17) |
N4—C11—C10 | 174.7 (3) | C12—N5—H5A | 115.5 |
O1—C12—N5 | 121.52 (17) | C13—N5—H5A | 115.5 |
O1—C12—C10 | 123.60 (18) |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3A···N4i | 0.86 | 2.49 | 3.044 (3) | 123 |
N3—H3A···O1 | 0.86 | 2.07 | 2.659 (2) | 126 |
Symmetry code: (i) x, y+1, z. |
Experimental details
Crystal data | |
Chemical formula | C19H18ClN5O |
Mr | 367.83 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 16.2019 (18), 7.6240 (9), 14.7368 (18) |
β (°) | 97.007 (3) |
V (Å3) | 1806.7 (4) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.23 |
Crystal size (mm) | 0.26 × 0.23 × 0.21 |
Data collection | |
Diffractometer | Bruker APEXII CCD area-detector |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1997) |
Tmin, Tmax | 0.943, 0.953 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 19209, 3512, 2618 |
Rint | 0.060 |
(sin θ/λ)max (Å−1) | 0.617 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.049, 0.139, 1.03 |
No. of reflections | 3512 |
No. of parameters | 238 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.22, −0.28 |
Computer programs: APEX2 (Bruker, 2002), SAINT (Bruker, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997), WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3A···N4i | 0.86 | 2.49 | 3.044 (3) | 123.0 |
N3—H3A···O1 | 0.86 | 2.07 | 2.659 (2) | 125.5 |
Symmetry code: (i) x, y+1, z. |
Acknowledgements
The author gratefully acknowledges the National Natural Science Foundation of China (Nos 20872021 and 21162004) and the Agricultural Scientific and Technological Project of Guizhou Province (No. 20103068) for financial support. The author also acknowledges the assistance of Professor Q. L. Zhang of Guiyang Medical University.
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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.
Neonicotinoids, an interesting class of insecticide known to act on the central nervous system of insects, are widely used in agriculture due to their broad spectrum activity and low mammalian toxicity. As a part of our ongoing investigation of neonicotinoids analogs, we presented a series of neonicotinoid analogs bearing amide moieties that exhibit good activity against Nilaparvata lugens at 100 mg/L (Wu et al., 2011). However,the accurate configuration of the active compound in our previous work has not been reported. Herein, we report the crystal structure of the title compound, (E)-2-(1-((6-chloropyridin-3-yl)methyl)imidazolidin-2-ylidene)-2- cyano-N-(o-tolyl)acetamide. It is noteworthy that the crystal of neonicotinoid analog bearing an amide moiety was obtained for the first time.
In the molecule of the title compound (Fig. 1), the imidazoline ring makes dihedral angles of 87.62 (17) ° with pyridine ring and 28.27 (11) ° with benzene ring. An intramolecular N—H···O hydrogen bond is observed between the O atom of carbonyl and imidazoline H atom; The ststructure possesses an intramolecular N3—H3A···O1 hydrogen bond with N3—H3A = 0.86 Å, H3A—O1 = 2.0661 Å, N3—O1 = 2.659 (2) Å, and N—H···O = 125.44 °. In the crystal structure, there are N3—H3A···N4i hydrogen bonds and C—H···π interactions between neighboring molecules, which with the length for bonds N3—H3A, H3A—N4, H3A—N4 were 0.86 Å, 2.4883 Å, 3.044 (3) Å and the angles for N—H···N, C8—H8B···Cg(2)ii were 123.03 ° and 113.20 °, respectively; Furthermore, the length for H8B···Cg(2)ii and C8···Cg(2)ii were 3.1386 Å and 3.632 (3) Å, the angle of C19—H12A···Cg(3)iii is 130.96 °; In addition, the length of H12A···Cg(3)iii and C19···Cg(3)iii were 3.0384 Å and 3.827 (3) Å, respectively [symmetry codes: (i) x,-1 + y,z, (ii) x,-1 + y,z, (iii) x,1 - y,1 - z].