Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807047344/tk2195sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807047344/tk2195Isup2.hkl |
CCDC reference: 667281
Morpholine (0.6 ml, 6.09 mmol) and formaldehyde (0.5 ml, 18.27 mmol) were added to 2-methylthiobenzimidazole (1 g, 6.09 mmol) in dry ethanol (20 ml). The mixture was refluxed for 3 h, the solvent removed under vacuum, the residue diluted with water, and extracted with dichloromethane. The organic phase was dried (MgSO4), filtered, and concentrated in vacuo. The residue was purified by chromatography (elution with ethyl acetate) to give (I) as colorless crystals (1.1 g, 69%): m. p. 352 K. 1H NMR (DMSO, 300 MHz, p.p.m.) δ 2.50 (t, 4H, 2CH2N), 2.67 (s, 3H, CH3), 3.51 (t, 4H, 2CH2O), 4.76 (s, 2H, CH2, NCH2N), 7.06–7.54 (m, 4H, C6H4). 13C NMR (DMSO, 300 MHz, p.p.m.) δ 14.47 (CH3), 50.50 (CH2NCH2), 65.08 (NCH2N), 65.89 (2 CH2O), 110.15, 117.44, 120.99, 121.54, 134.02, 142.87 (C4—C9), 153.35 (C═N).
The H atoms were placed at calculated positions with C—H in the range of 0.96–1.01 Å, and with Uiso(H) = 1.13–1.5Ueq(carrier).
Benzimidazole derivatives are important pharmaceutical intermediates. For example, they are used in the design of anti-helmintic (Dubey et al., 1985) and anti-viral (Garuti et al., 2000) pharmaceutics. In order to have a better knowledge of their structure, we have embarked on a study this class of compounds. In the title compound, C13H17N3OS (I), the benzimidazole ring N1/C2/N3/C4—C9 is essentially planar and is connected to the morpholine ring, N11/C12/C13/O14/C15/C16, by the methylene-C10 atom. The morpholine ring has a chair conformation as judged from the puckering parameters: QT = 0.571 Å, θ = 179.4° and φ = 184.6° (Cremer & Pople, 1975) with the C10 atom in an equatorial position. The structure is consolidated by weak intermolecular interactions (Table 1).
For related literature, see: Dubey et al. (1985); Garuti et al. (2000); Cremer & Pople (1975); Katritzky et al. (1997).
Data collection: COLLECT (Nonius, 2001); cell refinement: DENZO/SCALEPACK (Otwinowski & Minor, 1997); data reduction: DENZO/SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SIR92 (Altomare et al., 1994); program(s) used to refine structure: CRYSTALS (Betteridge et al., 2003); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: CRYSTALS (Betteridge et al., 2003).
Fig. 1. The molecular structure of (I) showing the atomic labeling scheme with displacement ellipsoids drawn at the 30% probability level. H atoms are shown as spheres of arbitary radius. |
C13H17N3OS | Z = 2 |
Mr = 263.36 | F(000) = 280 |
Triclinic, P1 | Dx = 1.300 Mg m−3 |
Hall symbol: -P 1 | Melting point: 352 K |
a = 6.2461 (2) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 9.7949 (2) Å | Cell parameters from 3812 reflections |
c = 11.6966 (5) Å | θ = 4–30° |
α = 75.475 (1)° | µ = 0.23 mm−1 |
β = 84.808 (1)° | T = 294 K |
γ = 76.251 (2)° | Prism, colorless |
V = 672.51 (4) Å3 | 0.40 × 0.30 × 0.30 mm |
Nonius KappaCCD diffractometer | Rint = 0.026 |
Graphite monochromator | θmax = 30.0°, θmin = 1.8° |
φ scans | h = −8→8 |
12818 measured reflections | k = −12→13 |
3812 independent reflections | l = −16→16 |
3284 reflections with I > 2σ(I) |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.043 | H-atom parameters constrained |
wR(F2) = 0.096 | Method, part 1, Chebychev polynomial, [Watkin, D. (1994).
Acta Cryst. A50, 411–437. Prince, E. (1982). Mathematical Techniques in
Crystallography and Materials Science. New York: Springer-Verlag.]
[weight] = 1.0/[A0*T0(x) + A1*T1(x) ··· + An-1]*Tn-1(x)]
where Ai are the Chebychev coefficients listed below and x = F /Fmax Method = Robust Weighting (Prince, 1982) W = [weight] * [1-(deltaF/6*sigmaF)2]2 Ai are: 488. 738. 431. 172. 33.5 |
S = 0.92 | (Δ/σ)max < 0.001 |
3817 reflections | Δρmax = 0.23 e Å−3 |
163 parameters | Δρmin = −0.25 e Å−3 |
0 restraints |
C13H17N3OS | γ = 76.251 (2)° |
Mr = 263.36 | V = 672.51 (4) Å3 |
Triclinic, P1 | Z = 2 |
a = 6.2461 (2) Å | Mo Kα radiation |
b = 9.7949 (2) Å | µ = 0.23 mm−1 |
c = 11.6966 (5) Å | T = 294 K |
α = 75.475 (1)° | 0.40 × 0.30 × 0.30 mm |
β = 84.808 (1)° |
Nonius KappaCCD diffractometer | 3284 reflections with I > 2σ(I) |
12818 measured reflections | Rint = 0.026 |
3812 independent reflections |
R[F2 > 2σ(F2)] = 0.043 | 0 restraints |
wR(F2) = 0.096 | H-atom parameters constrained |
S = 0.92 | Δρmax = 0.23 e Å−3 |
3817 reflections | Δρmin = −0.25 e Å−3 |
163 parameters |
x | y | z | Uiso*/Ueq | ||
H4 | 0.0870 | −0.1337 | 0.4686 | 0.0597* | |
H5 | 0.2946 | −0.3677 | 0.4625 | 0.0673* | |
H6 | 0.6429 | −0.4009 | 0.3691 | 0.0660* | |
H7 | 0.8112 | −0.2040 | 0.2879 | 0.0591* | |
H101 | 0.9009 | 0.0258 | 0.2412 | 0.0582* | |
H102 | 0.8445 | 0.1724 | 0.2873 | 0.0590* | |
H121 | 1.1010 | 0.1571 | 0.0820 | 0.0683* | |
H122 | 1.0136 | 0.3003 | 0.1296 | 0.0674* | |
H131 | 1.1036 | 0.3597 | −0.0774 | 0.0902* | |
H132 | 0.8395 | 0.4284 | −0.0455 | 0.0896* | |
H151 | 0.5774 | 0.3214 | −0.0837 | 0.0965* | |
H152 | 0.6497 | 0.1739 | −0.1392 | 0.0961* | |
H161 | 0.5522 | 0.1153 | 0.0655 | 0.0701* | |
H162 | 0.8054 | 0.0401 | 0.0394 | 0.0708* | |
H181 | 0.1456 | 0.3821 | 0.4361 | 0.0934* | |
H182 | 0.1018 | 0.5284 | 0.3327 | 0.0928* | |
H183 | 0.0064 | 0.3947 | 0.3217 | 0.0930* | |
N1 | 0.58426 (17) | 0.08468 (11) | 0.29036 (9) | 0.0419 | |
C2 | 0.3987 (2) | 0.17950 (13) | 0.31895 (11) | 0.0409 | |
N3 | 0.24286 (17) | 0.11681 (11) | 0.37395 (10) | 0.0434 | |
C4 | 0.2341 (2) | −0.14769 (15) | 0.43270 (12) | 0.0498 | |
C5 | 0.3558 (3) | −0.28335 (16) | 0.42638 (14) | 0.0572 | |
C6 | 0.5646 (3) | −0.30343 (16) | 0.37240 (14) | 0.0576 | |
C7 | 0.6637 (2) | −0.18902 (15) | 0.32349 (13) | 0.0499 | |
C8 | 0.5408 (2) | −0.05237 (13) | 0.33039 (10) | 0.0399 | |
C9 | 0.3294 (2) | −0.03035 (13) | 0.38288 (10) | 0.0400 | |
C10 | 0.7913 (2) | 0.11818 (16) | 0.23991 (12) | 0.0488 | |
N11 | 0.76733 (17) | 0.20686 (12) | 0.12018 (9) | 0.0427 | |
C12 | 0.9767 (2) | 0.24619 (18) | 0.07720 (13) | 0.0550 | |
C13 | 0.9562 (3) | 0.3378 (2) | −0.04718 (15) | 0.0732 | |
O14 | 0.8918 (2) | 0.26370 (17) | −0.12346 (10) | 0.0819 | |
C15 | 0.6858 (3) | 0.2283 (3) | −0.08343 (15) | 0.0769 | |
C16 | 0.6983 (3) | 0.13381 (18) | 0.04037 (13) | 0.0556 | |
S17 | 0.38074 (7) | 0.36544 (4) | 0.27562 (4) | 0.0558 | |
C18 | 0.1258 (3) | 0.42494 (17) | 0.35116 (16) | 0.0639 |
U11 | U22 | U33 | U12 | U13 | U23 | |
N1 | 0.0372 (5) | 0.0433 (5) | 0.0423 (5) | −0.0112 (4) | −0.0017 (4) | −0.0026 (4) |
C2 | 0.0416 (6) | 0.0404 (6) | 0.0394 (6) | −0.0092 (5) | −0.0060 (5) | −0.0053 (5) |
N3 | 0.0404 (5) | 0.0425 (5) | 0.0457 (6) | −0.0097 (4) | −0.0006 (4) | −0.0073 (4) |
C4 | 0.0508 (7) | 0.0506 (7) | 0.0472 (7) | −0.0193 (6) | 0.0000 (5) | −0.0029 (5) |
C5 | 0.0712 (9) | 0.0439 (7) | 0.0551 (8) | −0.0213 (7) | −0.0070 (7) | 0.0004 (6) |
C6 | 0.0679 (9) | 0.0407 (7) | 0.0585 (8) | −0.0043 (6) | −0.0095 (7) | −0.0061 (6) |
C7 | 0.0469 (7) | 0.0476 (7) | 0.0496 (7) | −0.0029 (5) | −0.0037 (5) | −0.0077 (5) |
C8 | 0.0400 (6) | 0.0414 (6) | 0.0359 (5) | −0.0095 (5) | −0.0054 (4) | −0.0028 (4) |
C9 | 0.0402 (6) | 0.0417 (6) | 0.0365 (5) | −0.0102 (5) | −0.0038 (4) | −0.0042 (4) |
C10 | 0.0376 (6) | 0.0604 (8) | 0.0453 (7) | −0.0167 (6) | −0.0063 (5) | 0.0003 (6) |
N11 | 0.0387 (5) | 0.0477 (6) | 0.0412 (5) | −0.0144 (4) | −0.0016 (4) | −0.0054 (4) |
C12 | 0.0493 (7) | 0.0644 (9) | 0.0542 (8) | −0.0273 (7) | 0.0019 (6) | −0.0070 (6) |
C13 | 0.0788 (11) | 0.0854 (12) | 0.0571 (9) | −0.0430 (10) | 0.0057 (8) | 0.0004 (8) |
O14 | 0.0874 (9) | 0.1174 (11) | 0.0467 (6) | −0.0465 (8) | 0.0116 (6) | −0.0125 (7) |
C15 | 0.0796 (12) | 0.1112 (15) | 0.0468 (8) | −0.0419 (11) | −0.0058 (8) | −0.0105 (9) |
C16 | 0.0552 (8) | 0.0686 (9) | 0.0499 (7) | −0.0265 (7) | −0.0015 (6) | −0.0146 (7) |
S17 | 0.0609 (2) | 0.04020 (18) | 0.0633 (2) | −0.01433 (15) | −0.00462 (17) | −0.00330 (14) |
C18 | 0.0739 (10) | 0.0477 (8) | 0.0681 (10) | −0.0049 (7) | −0.0021 (8) | −0.0182 (7) |
H4—C4 | 0.969 | N1—C10 | 1.4473 (15) |
H5—C5 | 0.976 | C2—N3 | 1.3083 (16) |
H6—C6 | 0.972 | C2—S17 | 1.7426 (13) |
H7—C7 | 0.970 | N3—C9 | 1.3947 (16) |
H101—C10 | 0.994 | C4—C5 | 1.381 (2) |
H102—C10 | 0.982 | C4—C9 | 1.3934 (17) |
H121—C12 | 1.014 | C5—C6 | 1.389 (2) |
H122—C12 | 0.977 | C6—C7 | 1.382 (2) |
H131—C13 | 1.008 | C7—C8 | 1.3935 (18) |
H132—C13 | 1.009 | C8—C9 | 1.3969 (17) |
H151—C15 | 0.998 | C10—N11 | 1.4506 (16) |
H152—C15 | 1.009 | N11—C12 | 1.4612 (16) |
H161—C16 | 0.977 | N11—C16 | 1.4573 (18) |
H162—C16 | 1.001 | C12—C13 | 1.504 (2) |
H181—C18 | 0.983 | C13—O14 | 1.419 (2) |
H182—C18 | 0.959 | O14—C15 | 1.420 (2) |
H183—C18 | 0.982 | C15—C16 | 1.508 (2) |
N1—C2 | 1.3753 (16) | S17—C18 | 1.7943 (17) |
N1—C8 | 1.3891 (15) | ||
C2—N1—C8 | 106.01 (10) | C12—N11—C16 | 109.85 (11) |
C2—N1—C10 | 127.25 (11) | H121—C12—N11 | 111.3 |
C8—N1—C10 | 126.47 (11) | H121—C12—H122 | 106.5 |
N1—C2—N3 | 113.89 (11) | N11—C12—H122 | 107.8 |
N1—C2—S17 | 120.33 (9) | H121—C12—C13 | 110.9 |
N3—C2—S17 | 125.69 (10) | N11—C12—C13 | 110.13 (13) |
C2—N3—C9 | 104.42 (10) | H122—C12—C13 | 110.1 |
H4—C4—C5 | 121.8 | C12—C13—H132 | 107.4 |
H4—C4—C9 | 120.9 | C12—C13—H131 | 109.4 |
C5—C4—C9 | 117.30 (13) | H132—C13—H131 | 112.1 |
H5—C5—C4 | 119.0 | C12—C13—O14 | 110.91 (14) |
H5—C5—C6 | 119.1 | H132—C13—O14 | 109.3 |
C4—C5—C6 | 121.91 (13) | H131—C13—O14 | 107.7 |
H6—C6—C5 | 118.9 | C13—O14—C15 | 109.89 (14) |
H6—C6—C7 | 119.2 | H152—C15—H151 | 113.6 |
C5—C6—C7 | 121.89 (14) | H152—C15—O14 | 106.7 |
H7—C7—C6 | 121.5 | H151—C15—O14 | 106.8 |
H7—C7—C8 | 122.4 | H152—C15—C16 | 109.4 |
C6—C7—C8 | 116.07 (13) | H151—C15—C16 | 109.1 |
C7—C8—N1 | 132.06 (12) | O14—C15—C16 | 111.21 (14) |
C7—C8—C9 | 122.65 (12) | C15—C16—N11 | 109.90 (13) |
N1—C8—C9 | 105.28 (10) | C15—C16—H162 | 108.5 |
C8—C9—N3 | 110.40 (10) | N11—C16—H162 | 110.9 |
C8—C9—C4 | 120.17 (12) | C15—C16—H161 | 108.5 |
N3—C9—C4 | 129.42 (12) | N11—C16—H161 | 109.6 |
N1—C10—H101 | 108.4 | H162—C16—H161 | 109.4 |
N1—C10—H102 | 109.7 | C2—S17—C18 | 98.85 (7) |
H101—C10—H102 | 109.1 | S17—C18—H181 | 107.5 |
N1—C10—N11 | 111.62 (10) | S17—C18—H183 | 109.7 |
H101—C10—N11 | 110.4 | H181—C18—H183 | 111.4 |
H102—C10—N11 | 107.6 | S17—C18—H182 | 105.0 |
C10—N11—C12 | 109.15 (10) | H181—C18—H182 | 112.1 |
C10—N11—C16 | 112.30 (11) | H183—C18—H182 | 110.9 |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7···O14i | 0.97 | 2.62 | 3.526 (2) | 155 |
C4—H4···N3ii | 0.97 | 2.64 | 3.574 (2) | 162 |
C10—H102···N3iii | 0.98 | 2.66 | 3.344 (2) | 127 |
Symmetry codes: (i) −x+2, −y, −z; (ii) −x, −y, −z+1; (iii) x+1, y, z. |
Experimental details
Crystal data | |
Chemical formula | C13H17N3OS |
Mr | 263.36 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 294 |
a, b, c (Å) | 6.2461 (2), 9.7949 (2), 11.6966 (5) |
α, β, γ (°) | 75.475 (1), 84.808 (1), 76.251 (2) |
V (Å3) | 672.51 (4) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.23 |
Crystal size (mm) | 0.40 × 0.30 × 0.30 |
Data collection | |
Diffractometer | Nonius KappaCCD |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 12818, 3812, 3284 |
Rint | 0.026 |
(sin θ/λ)max (Å−1) | 0.703 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.043, 0.096, 0.92 |
No. of reflections | 3817 |
No. of parameters | 163 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.23, −0.25 |
Computer programs: COLLECT (Nonius, 2001), DENZO/SCALEPACK (Otwinowski & Minor, 1997), SIR92 (Altomare et al., 1994), CRYSTALS (Betteridge et al., 2003), ORTEP-3 for Windows (Farrugia, 1997).
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7···O14i | 0.97 | 2.62 | 3.526 (2) | 155 |
C4—H4···N3ii | 0.97 | 2.64 | 3.574 (2) | 162 |
C10—H102···N3iii | 0.98 | 2.66 | 3.344 (2) | 127 |
Symmetry codes: (i) −x+2, −y, −z; (ii) −x, −y, −z+1; (iii) x+1, y, z. |
Benzimidazole derivatives are important pharmaceutical intermediates. For example, they are used in the design of anti-helmintic (Dubey et al., 1985) and anti-viral (Garuti et al., 2000) pharmaceutics. In order to have a better knowledge of their structure, we have embarked on a study this class of compounds. In the title compound, C13H17N3OS (I), the benzimidazole ring N1/C2/N3/C4—C9 is essentially planar and is connected to the morpholine ring, N11/C12/C13/O14/C15/C16, by the methylene-C10 atom. The morpholine ring has a chair conformation as judged from the puckering parameters: QT = 0.571 Å, θ = 179.4° and φ = 184.6° (Cremer & Pople, 1975) with the C10 atom in an equatorial position. The structure is consolidated by weak intermolecular interactions (Table 1).