organic compounds
1-(2,6-Diisopropylphenyl)-1H-benzimidazole
aPharmaceutical Department of The First Affiliated Hospital of Guangdong Pharmaceutical University, Clinical Pharmacy Department of Guangdong Pharmaceutical University, Guangzhou 510080, People's Republic of China
*Correspondence e-mail: puma_0003@163.com
In the title compound, C19H22N2, both the benzimidazole unit and the 2,6-diisopropylphenyl group are essentially planar [maximum deviations from the least-squares planes of 0.005 (1) and 0.009 (1) Å, respectively]. The dihedral angle between the two planes is 79.6 (7)°. In the crystal, molecules are linked into chains along the a-axis direction by weak C—H⋯N interactions. The also features C—H⋯π interactions, which link the chains into a three-dimensional network.
Related literature
For the properties of related compounds, see: Shi et al. (2013); Cross et al. (1995); Akpinar et al. (2010); Wang et al. (2007); Mason et al. (1999). For bond lengths and angles in related structures, see: Jayamoorthy et al. (2013); Fathima et al. (2013); Geiger & Nellist (2013).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2008); cell SAINT (Bruker, 2008); data reduction: SAINT; 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
10.1107/S1600536813020473/bg2510sup1.cif
contains datablocks I, New_Global_Publ_Block. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536813020473/bg2510Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536813020473/bg2510Isup3.cml
N-(2-bromophenyl)-N'-(2, 6-diisopropylphenyl)-Methanimidamide, (1.65 g, 4.58 mmol, 1 eq.) was dissolved in 18.5 ml DMSO. CuI (174 mg, 0.92 mmol, 20 mol%) and DBU (1.37 ml, 1.39 g, 9.16 mmol, 2 eq.) were added and the reaction was stirred for 3 h at 110 °C. H2O(160 ml) and acetoacetate (160 ml) were added and the layers were separated. The aqueous layer was extracted with acetoacetate (2 τimes 20 ml), the combined organic layers were dried over Na2SO4. The crude mixture was purified by to afford the benzimidazole (1.22 g, 96%). Single crystals were grown in ethanol as a solvent at room temperature.
C-bound H-atoms were geometrically positioned (C–H 0.93 or 0.98 Å for aromatic or methyl C atoms respectively) and refined using a riding model, with Uiso = 1.2/1.5Ueq (C), respectively.
Data collection: APEX2 (Bruker, 2008); cell
SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); 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).Fig. 1. Molecular structure of the title compound. Displacement ellipsoids are shown at the 40% probability level. H atoms are presented as small spheres of arbitrary radius. | |
Fig. 2. Packing diagram of (I). Dashed lines indicate intermolecular hydrogen bonding interactions. |
C19H22N2 | F(000) = 600 |
Mr = 278.39 | Dx = 1.140 Mg m−3 |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 5376 reflections |
a = 6.6471 (8) Å | θ = 2.4–27.1° |
b = 14.1216 (18) Å | µ = 0.07 mm−1 |
c = 17.285 (2) Å | T = 173 K |
V = 1622.5 (4) Å3 | Block, colorless |
Z = 4 | 0.44 × 0.42 × 0.28 mm |
Bruker APEXII CCD area-detector diffractometer | 3551 independent reflections |
Radiation source: fine-focus sealed tube | 3133 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.020 |
Detector resolution: 0 pixels mm-1 | θmax = 27.1°, θmin = 1.9° |
phi and ω scans | h = −8→8 |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | k = −18→16 |
Tmin = 0.971, Tmax = 0.982 | l = −18→22 |
9716 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)] = 0.035 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.088 | H-atom parameters constrained |
S = 1.08 | w = 1/[σ2(Fo2) + (0.0411P)2 + 0.2264P] where P = (Fo2 + 2Fc2)/3 |
3551 reflections | (Δ/σ)max < 0.001 |
194 parameters | Δρmax = 0.16 e Å−3 |
0 restraints | Δρmin = −0.16 e Å−3 |
C19H22N2 | V = 1622.5 (4) Å3 |
Mr = 278.39 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 6.6471 (8) Å | µ = 0.07 mm−1 |
b = 14.1216 (18) Å | T = 173 K |
c = 17.285 (2) Å | 0.44 × 0.42 × 0.28 mm |
Bruker APEXII CCD area-detector diffractometer | 3551 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | 3133 reflections with I > 2σ(I) |
Tmin = 0.971, Tmax = 0.982 | Rint = 0.020 |
9716 measured reflections |
R[F2 > 2σ(F2)] = 0.035 | 0 restraints |
wR(F2) = 0.088 | H-atom parameters constrained |
S = 1.08 | Δρmax = 0.16 e Å−3 |
3551 reflections | Δρmin = −0.16 e Å−3 |
194 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. |
x | y | z | Uiso*/Ueq | ||
C1 | 1.2274 (2) | 0.79599 (10) | 0.29080 (8) | 0.0303 (3) | |
H1 | 1.2920 | 0.7885 | 0.3394 | 0.036* | |
N1 | 1.32623 (17) | 0.80167 (9) | 0.22581 (7) | 0.0335 (3) | |
C2 | 1.17791 (19) | 0.81252 (9) | 0.17010 (8) | 0.0262 (3) | |
N2 | 1.02227 (16) | 0.80177 (8) | 0.28307 (6) | 0.0243 (2) | |
C3 | 1.1940 (2) | 0.82181 (10) | 0.08970 (8) | 0.0327 (3) | |
H3 | 1.3217 | 0.8218 | 0.0650 | 0.039* | |
C4 | 1.0203 (2) | 0.83093 (11) | 0.04764 (8) | 0.0366 (3) | |
H4 | 1.0285 | 0.8375 | −0.0070 | 0.044* | |
C5 | 0.8308 (2) | 0.83080 (11) | 0.08327 (8) | 0.0347 (3) | |
H5 | 0.7138 | 0.8373 | 0.0522 | 0.042* | |
C6 | 0.8096 (2) | 0.82147 (10) | 0.16281 (8) | 0.0284 (3) | |
H6 | 0.6814 | 0.8211 | 0.1872 | 0.034* | |
C7 | 0.9866 (2) | 0.81270 (8) | 0.20455 (7) | 0.0234 (3) | |
C8 | 0.87636 (19) | 0.80084 (9) | 0.34461 (7) | 0.0227 (3) | |
C9 | 0.8510 (2) | 0.88320 (9) | 0.38878 (7) | 0.0254 (3) | |
C10 | 0.9634 (2) | 0.97431 (10) | 0.37135 (8) | 0.0324 (3) | |
H10 | 1.0380 | 0.9652 | 0.3217 | 0.039* | |
C11 | 0.8185 (3) | 1.05673 (13) | 0.36039 (13) | 0.0604 (6) | |
H11A | 0.7243 | 1.0419 | 0.3185 | 0.091* | |
H11B | 0.8946 | 1.1140 | 0.3472 | 0.091* | |
H11C | 0.7436 | 1.0674 | 0.4084 | 0.091* | |
C12 | 1.1172 (4) | 0.99708 (15) | 0.43400 (12) | 0.0645 (6) | |
H12A | 1.0480 | 1.0063 | 0.4835 | 0.097* | |
H12B | 1.1898 | 1.0550 | 0.4202 | 0.097* | |
H12C | 1.2127 | 0.9445 | 0.4386 | 0.097* | |
C13 | 0.7136 (2) | 0.87915 (10) | 0.44978 (8) | 0.0303 (3) | |
H13 | 0.6941 | 0.9334 | 0.4815 | 0.036* | |
C14 | 0.6056 (2) | 0.79775 (11) | 0.46485 (8) | 0.0315 (3) | |
H14 | 0.5136 | 0.7963 | 0.5069 | 0.038* | |
C15 | 0.6306 (2) | 0.71811 (10) | 0.41892 (8) | 0.0292 (3) | |
H15 | 0.5532 | 0.6630 | 0.4292 | 0.035* | |
C16 | 0.76747 (19) | 0.71788 (10) | 0.35795 (7) | 0.0249 (3) | |
C17 | 0.8059 (2) | 0.62843 (10) | 0.31125 (8) | 0.0303 (3) | |
H17 | 0.8567 | 0.6479 | 0.2592 | 0.036* | |
C18 | 0.9704 (3) | 0.56985 (11) | 0.35044 (10) | 0.0421 (4) | |
H18A | 1.0924 | 0.6083 | 0.3557 | 0.063* | |
H18B | 0.9999 | 0.5138 | 0.3189 | 0.063* | |
H18C | 0.9244 | 0.5499 | 0.4018 | 0.063* | |
C19 | 0.6166 (3) | 0.56884 (13) | 0.29914 (12) | 0.0534 (5) | |
H19A | 0.5719 | 0.5432 | 0.3489 | 0.080* | |
H19B | 0.6465 | 0.5166 | 0.2636 | 0.080* | |
H19C | 0.5101 | 0.6085 | 0.2771 | 0.080* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0239 (6) | 0.0333 (8) | 0.0338 (7) | 0.0025 (6) | −0.0026 (6) | 0.0005 (6) |
N1 | 0.0241 (6) | 0.0388 (7) | 0.0375 (7) | 0.0032 (5) | 0.0041 (5) | 0.0009 (5) |
C2 | 0.0238 (6) | 0.0226 (6) | 0.0324 (7) | −0.0001 (5) | 0.0043 (5) | −0.0012 (5) |
N2 | 0.0211 (5) | 0.0284 (6) | 0.0234 (5) | 0.0027 (5) | 0.0009 (4) | −0.0005 (4) |
C3 | 0.0331 (7) | 0.0323 (8) | 0.0325 (7) | −0.0025 (6) | 0.0124 (6) | −0.0023 (6) |
C4 | 0.0451 (9) | 0.0407 (8) | 0.0239 (7) | −0.0053 (7) | 0.0070 (7) | −0.0005 (6) |
C5 | 0.0328 (8) | 0.0425 (8) | 0.0286 (7) | −0.0065 (7) | −0.0041 (6) | 0.0019 (6) |
C6 | 0.0232 (6) | 0.0348 (8) | 0.0271 (7) | −0.0021 (6) | 0.0015 (5) | −0.0005 (6) |
C7 | 0.0265 (6) | 0.0193 (6) | 0.0244 (6) | −0.0011 (5) | 0.0041 (5) | −0.0013 (5) |
C8 | 0.0197 (6) | 0.0294 (7) | 0.0189 (6) | 0.0034 (5) | −0.0001 (5) | 0.0015 (5) |
C9 | 0.0260 (6) | 0.0271 (7) | 0.0232 (6) | 0.0022 (5) | −0.0026 (5) | 0.0014 (5) |
C10 | 0.0404 (8) | 0.0262 (7) | 0.0305 (7) | −0.0017 (6) | 0.0044 (6) | −0.0009 (5) |
C11 | 0.0707 (13) | 0.0352 (9) | 0.0754 (13) | 0.0121 (9) | 0.0173 (11) | 0.0173 (9) |
C12 | 0.0756 (14) | 0.0544 (12) | 0.0634 (13) | −0.0329 (11) | −0.0177 (11) | 0.0042 (9) |
C13 | 0.0354 (7) | 0.0303 (7) | 0.0254 (7) | 0.0052 (6) | 0.0029 (6) | −0.0026 (6) |
C14 | 0.0283 (7) | 0.0431 (8) | 0.0232 (7) | 0.0030 (6) | 0.0054 (5) | 0.0025 (6) |
C15 | 0.0271 (7) | 0.0322 (7) | 0.0283 (7) | −0.0034 (6) | −0.0003 (6) | 0.0056 (6) |
C16 | 0.0249 (6) | 0.0274 (7) | 0.0226 (6) | 0.0028 (5) | −0.0039 (5) | 0.0014 (5) |
C17 | 0.0374 (8) | 0.0274 (7) | 0.0262 (7) | −0.0015 (6) | −0.0019 (6) | −0.0018 (5) |
C18 | 0.0470 (10) | 0.0309 (8) | 0.0485 (9) | 0.0066 (7) | −0.0081 (8) | −0.0062 (7) |
C19 | 0.0466 (10) | 0.0429 (10) | 0.0706 (13) | −0.0067 (8) | −0.0106 (10) | −0.0192 (9) |
C1—N1 | 1.3038 (18) | C11—H11A | 0.9800 |
C1—N2 | 1.3725 (16) | C11—H11B | 0.9800 |
C1—H1 | 0.9500 | C11—H11C | 0.9800 |
N1—C2 | 1.3868 (18) | C12—H12A | 0.9800 |
C2—C3 | 1.400 (2) | C12—H12B | 0.9800 |
C2—C7 | 1.4044 (18) | C12—H12C | 0.9800 |
N2—C7 | 1.3865 (16) | C13—C14 | 1.380 (2) |
N2—C8 | 1.4396 (15) | C13—H13 | 0.9500 |
C3—C4 | 1.370 (2) | C14—C15 | 1.387 (2) |
C3—H3 | 0.9500 | C14—H14 | 0.9500 |
C4—C5 | 1.402 (2) | C15—C16 | 1.3924 (19) |
C4—H4 | 0.9500 | C15—H15 | 0.9500 |
C5—C6 | 1.388 (2) | C16—C17 | 1.5207 (19) |
C5—H5 | 0.9500 | C17—C19 | 1.528 (2) |
C6—C7 | 1.3857 (18) | C17—C18 | 1.529 (2) |
C6—H6 | 0.9500 | C17—H17 | 1.0000 |
C8—C16 | 1.3963 (19) | C18—H18A | 0.9800 |
C8—C9 | 1.4013 (18) | C18—H18B | 0.9800 |
C9—C13 | 1.3961 (19) | C18—H18C | 0.9800 |
C9—C10 | 1.5181 (19) | C19—H19A | 0.9800 |
C10—C11 | 1.522 (2) | C19—H19B | 0.9800 |
C10—C12 | 1.524 (2) | C19—H19C | 0.9800 |
C10—H10 | 1.0000 | ||
N1—C1—N2 | 114.39 (12) | C10—C11—H11C | 109.5 |
N1—C1—H1 | 122.8 | H11A—C11—H11C | 109.5 |
N2—C1—H1 | 122.8 | H11B—C11—H11C | 109.5 |
C1—N1—C2 | 104.30 (11) | C10—C12—H12A | 109.5 |
N1—C2—C3 | 130.20 (12) | C10—C12—H12B | 109.5 |
N1—C2—C7 | 110.46 (11) | H12A—C12—H12B | 109.5 |
C3—C2—C7 | 119.33 (12) | C10—C12—H12C | 109.5 |
C1—N2—C7 | 105.78 (11) | H12A—C12—H12C | 109.5 |
C1—N2—C8 | 126.64 (11) | H12B—C12—H12C | 109.5 |
C7—N2—C8 | 127.52 (11) | C14—C13—C9 | 121.13 (13) |
C4—C3—C2 | 118.11 (13) | C14—C13—H13 | 119.4 |
C4—C3—H3 | 120.9 | C9—C13—H13 | 119.4 |
C2—C3—H3 | 120.9 | C13—C14—C15 | 120.34 (12) |
C3—C4—C5 | 121.57 (13) | C13—C14—H14 | 119.8 |
C3—C4—H4 | 119.2 | C15—C14—H14 | 119.8 |
C5—C4—H4 | 119.2 | C14—C15—C16 | 120.90 (13) |
C6—C5—C4 | 121.77 (14) | C14—C15—H15 | 119.5 |
C6—C5—H5 | 119.1 | C16—C15—H15 | 119.5 |
C4—C5—H5 | 119.1 | C15—C16—C8 | 117.50 (12) |
C7—C6—C5 | 115.96 (12) | C15—C16—C17 | 120.90 (12) |
C7—C6—H6 | 122.0 | C8—C16—C17 | 121.48 (11) |
C5—C6—H6 | 122.0 | C16—C17—C19 | 113.06 (12) |
C6—C7—N2 | 131.68 (12) | C16—C17—C18 | 109.53 (11) |
C6—C7—C2 | 123.26 (11) | C19—C17—C18 | 110.57 (13) |
N2—C7—C2 | 105.06 (11) | C16—C17—H17 | 107.8 |
C16—C8—C9 | 122.96 (11) | C19—C17—H17 | 107.8 |
C16—C8—N2 | 118.61 (11) | C18—C17—H17 | 107.8 |
C9—C8—N2 | 118.43 (11) | C17—C18—H18A | 109.5 |
C13—C9—C8 | 117.14 (12) | C17—C18—H18B | 109.5 |
C13—C9—C10 | 120.43 (12) | H18A—C18—H18B | 109.5 |
C8—C9—C10 | 122.42 (12) | C17—C18—H18C | 109.5 |
C9—C10—C11 | 111.19 (13) | H18A—C18—H18C | 109.5 |
C9—C10—C12 | 111.60 (13) | H18B—C18—H18C | 109.5 |
C11—C10—C12 | 110.58 (15) | C17—C19—H19A | 109.5 |
C9—C10—H10 | 107.8 | C17—C19—H19B | 109.5 |
C11—C10—H10 | 107.8 | H19A—C19—H19B | 109.5 |
C12—C10—H10 | 107.8 | C17—C19—H19C | 109.5 |
C10—C11—H11A | 109.5 | H19A—C19—H19C | 109.5 |
C10—C11—H11B | 109.5 | H19B—C19—H19C | 109.5 |
H11A—C11—H11B | 109.5 | ||
N2—C1—N1—C2 | 0.30 (16) | C7—N2—C8—C9 | −100.77 (14) |
C1—N1—C2—C3 | −179.65 (15) | C16—C8—C9—C13 | 1.78 (19) |
C1—N1—C2—C7 | −0.23 (15) | N2—C8—C9—C13 | −177.79 (12) |
N1—C1—N2—C7 | −0.25 (16) | C16—C8—C9—C10 | −177.13 (12) |
N1—C1—N2—C8 | −177.75 (12) | N2—C8—C9—C10 | 3.30 (18) |
N1—C2—C3—C4 | 179.48 (14) | C13—C9—C10—C11 | −54.09 (19) |
C7—C2—C3—C4 | 0.1 (2) | C8—C9—C10—C11 | 124.78 (15) |
C2—C3—C4—C5 | −0.2 (2) | C13—C9—C10—C12 | 69.89 (19) |
C3—C4—C5—C6 | 0.0 (2) | C8—C9—C10—C12 | −111.24 (16) |
C4—C5—C6—C7 | 0.2 (2) | C8—C9—C13—C14 | −1.0 (2) |
C5—C6—C7—N2 | −179.57 (13) | C10—C9—C13—C14 | 177.94 (13) |
C5—C6—C7—C2 | −0.32 (19) | C9—C13—C14—C15 | −0.5 (2) |
C1—N2—C7—C6 | 179.44 (14) | C13—C14—C15—C16 | 1.4 (2) |
C8—N2—C7—C6 | −3.1 (2) | C14—C15—C16—C8 | −0.60 (19) |
C1—N2—C7—C2 | 0.09 (14) | C14—C15—C16—C17 | 175.54 (13) |
C8—N2—C7—C2 | 177.56 (12) | C9—C8—C16—C15 | −1.00 (18) |
N1—C2—C7—C6 | −179.34 (13) | N2—C8—C16—C15 | 178.57 (11) |
C3—C2—C7—C6 | 0.16 (19) | C9—C8—C16—C17 | −177.12 (12) |
N1—C2—C7—N2 | 0.09 (14) | N2—C8—C16—C17 | 2.45 (18) |
C3—C2—C7—N2 | 179.58 (12) | C15—C16—C17—C19 | 36.52 (19) |
C1—N2—C8—C16 | −103.40 (15) | C8—C16—C17—C19 | −147.49 (14) |
C7—N2—C8—C16 | 79.63 (16) | C15—C16—C17—C18 | −87.28 (16) |
C1—N2—C8—C9 | 76.19 (17) | C8—C16—C17—C18 | 88.71 (15) |
Cg1 and Cg2 are the centroids of the C2–C7 and C8/C9/C13–C16 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
C6—H6···N1i | 0.95 | 2.47 | 3.4040 (18) | 168 |
C14—H14···Cg3ii | 0.95 | 2.68 | 3.5908 (16) | 150 |
C18—H18B···Cg2iii | 0.98 | 2.79 | 3.5314 (17) | 125 |
Symmetry codes: (i) x−1, y, z; (ii) x−1/2, −y+3/2, −z+1; (iii) −x+2, y−1/2, −z+1/2. |
Cg1 and Cg2 are the centroids of the C2–C7 and C8/C9/C13–C16 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
C6—H6···N1i | 0.95 | 2.47 | 3.4040 (18) | 168 |
C14—H14···Cg3ii | 0.9500 | 2.68 | 3.5908 (16) | 150 |
C18—H18B···Cg2iii | 0.9800 | 2.79 | 3.5314 (17) | 125 |
Symmetry codes: (i) x−1, y, z; (ii) x−1/2, −y+3/2, −z+1; (iii) −x+2, y−1/2, −z+1/2. |
Acknowledgements
We acknowledge the Foundation for Distinguished Young Talents in Higher Education of Guangdong (No. LYM10091) for financial support.
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Benzimidazole is one of the most important organic intermediates in drug design, in light of the affinity it displays towards some enzymes and protein receptors (Mason et al., 1999). Our interest is focused on the design and synthesis of benzimidazole derivatives with various ancillary ligands, and their application in antioxidant activities. Herein, we report the synthesis and structure of the title compound (I). Its molecular structure is shown in Fig.1. Bond lengths and angles of the benzimidazole group are in good agreement with those observed in other benzimidazole derivatives (Jayamoorthy et al., 2013; Fathima et al., 2013; Geiger et al., 2013). Both the benzimidazole unit and the 2, 6-diisopropylphenyl groups are essentially planar (max. deviations from the L.S. plane: 0.005 (1) and 0.009 (1)Å, for atoms C7 and C9, respectively). The dihedral angle between both planes is 100.4° (7). In the crystal structure, the molecules are linked into chains along the a axis by intermolecular C—H···N hydrogen bonds (Table 1). The structure is further stabilized by weak intermolecular C—H···Cg interactions linking chains into a 3D network (Table 1 and Fig 2).