organic compounds
2-Phenyl-8,9,10,11-tetrahydro-1-benzothieno[3,2-e][1,2,4]triazolo[1,5-c]pyrimidine
aDepartment of Chemistry, Karnatak University, Dharwad 580 003, India, and bDepartment of Studies in Chemistry, Bangalore University, Bangalore 560 001, India
*Correspondence e-mail: noorsb@rediffmail.com
In the title compound, C17H14N4S, the benzothieno moiety is fused at one end of the pyramidine ring while the triazole ring with a phenyl substituent is fused at the other side. The triazole ring is almost planar [maximum deviation = 0.0028 (3) Å] while the cyclohexane ring adopts a half-chair conformation. In the crystal, pairs of intermolecular C—H⋯N hydrogen bonds form centrosymmetric head-to-head dimers, corresponding to an R22(8) graph-set motif. Further C—H⋯N interactions generate a zigzag chain of molecules along the c axis. The supramolecular assembly is consolidated by π–π stacking interactions [centroid–centroid distance = 3.445 (4) Å].
Related literature
For the biological activity of thiophenes, benzothiophenes, pyrimidines and triazolopyrimidines, see: Shishoo & Jain (1992); Bradbury & Rivett (1991); Elslager et al. (1981); Yunosov et al. (1966); Blain et al. (1982). For related structures, see: Akkurt et al. (2008); Buzykin et al. (2008); Harrison et al. (2006); Lipson et al. (2006); Belcher & Squattrito (2006). For hydrogen-bond motifs, see: Bernstein et al. 1995). For puckering and asymmetry parameters, see: Cremer & Pople (1975); Nardelli (1983).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 1998); cell SAINT-Plus (Bruker, 1998); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and CAMERON (Watkin et al., 1996); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
10.1107/S1600536811007331/pb2056sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811007331/pb2056Isup2.hkl
A solution of 2-Amino-4,5,6,7-tetrahydro-benzo[b]thiophene-3-carbonitrile (1.78 g, 10 mmole) in triethylorthoformate (12 ml) was heated under reflux for 18 h; excess triethylorthoformate was removed under pressure. The residue was treated with petroleum ether. Solid that separated was filtered and recrystallized with petroleum ether to afford light brown crystals of N-(3-Cyano-4, 5, 6, 7-tetrahydro-benzo[b]thiophen-2-yl)-formimidic acid ethyl ester. 0.234 g, 1 mmole of this mixture and benzoic acid hydrazide (0.136 g, 1 mmole) was stirred at room temperature in toluene (5 ml) and then AcOH (0.06 g,1 mmole) was added and refluxed further till the completion of the reaction. The reaction mixture was then washed with water and dried over sodium sulfate. Toluene was removed under pressure to get analytically pure product. Yield 74%; mp; 196–198° C.
The H atoms were placed at calculated positions in the riding model approximation with aromatic C—H = 0.97 Å, heterocyclic C—H = 0.93 Å, and Uiso(H) = 1.2Ueq(N/C).
Data collection: SMART (Bruker, 1998); cell
SAINT-Plus (Bruker, 1998); data reduction: SAINT-Plus (Bruker, 1998); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and CAMERON (Watkin et al., 1996); software used to prepare material for publication: WinGX (Farrugia, 1999).C17H14N4S | F(000) = 640 |
Mr = 306.38 | Dx = 1.443 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 3042 reflections |
a = 8.6239 (16) Å | θ = 2.6–27.0° |
b = 20.512 (4) Å | µ = 0.23 mm−1 |
c = 8.5952 (16) Å | T = 296 K |
β = 111.975 (3)° | Block, white |
V = 1410.0 (5) Å3 | 0.18 × 0.16 × 0.16 mm |
Z = 4 |
Bruker SMART APEX CCD detector diffractometer | 3042 independent reflections |
Radiation source: fine-focus sealed tube | 2345 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.057 |
ω scans | θmax = 27.0°, θmin = 2.6° |
Absorption correction: multi-scan (SADABS; Bruker, 1998) | h = −10→11 |
Tmin = 0.960, Tmax = 0.964 | k = −26→19 |
8272 measured reflections | l = −10→10 |
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)] = 0.060 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.202 | H-atom parameters constrained |
S = 1.25 | w = 1/[σ2(Fo2) + (0.1054P)2] where P = (Fo2 + 2Fc2)/3 |
3042 reflections | (Δ/σ)max = 0.001 |
199 parameters | Δρmax = 0.72 e Å−3 |
0 restraints | Δρmin = −0.66 e Å−3 |
C17H14N4S | V = 1410.0 (5) Å3 |
Mr = 306.38 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.6239 (16) Å | µ = 0.23 mm−1 |
b = 20.512 (4) Å | T = 296 K |
c = 8.5952 (16) Å | 0.18 × 0.16 × 0.16 mm |
β = 111.975 (3)° |
Bruker SMART APEX CCD detector diffractometer | 3042 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 1998) | 2345 reflections with I > 2σ(I) |
Tmin = 0.960, Tmax = 0.964 | Rint = 0.057 |
8272 measured reflections |
R[F2 > 2σ(F2)] = 0.060 | 0 restraints |
wR(F2) = 0.202 | H-atom parameters constrained |
S = 1.25 | Δρmax = 0.72 e Å−3 |
3042 reflections | Δρmin = −0.66 e Å−3 |
199 parameters |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 > 2σ(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 | −0.1145 (3) | 0.57323 (12) | 0.5033 (3) | 0.0166 (6) | |
C2 | −0.2370 (3) | 0.52330 (12) | 0.4477 (3) | 0.0160 (6) | |
C3 | −0.4107 (3) | 0.44589 (13) | 0.3912 (3) | 0.0163 (6) | |
C4 | −0.5006 (3) | 0.38839 (13) | 0.4128 (3) | 0.0177 (6) | |
C5 | −0.3157 (3) | 0.56670 (13) | 0.1641 (4) | 0.0205 (6) | |
H5 | −0.3857 | 0.5635 | 0.0517 | 0.025* | |
C6 | −0.1062 (3) | 0.61456 (13) | 0.3786 (4) | 0.0189 (6) | |
C7 | 0.0023 (3) | 0.58943 (13) | 0.6675 (3) | 0.0174 (6) | |
C8 | 0.0944 (3) | 0.64270 (13) | 0.6629 (3) | 0.0185 (6) | |
C9 | 0.2214 (4) | 0.67497 (14) | 0.8139 (4) | 0.0228 (6) | |
H9A | 0.2104 | 0.7220 | 0.8025 | 0.027* | |
H9B | 0.3332 | 0.6631 | 0.8226 | 0.027* | |
C10 | 0.1936 (4) | 0.65306 (15) | 0.9725 (4) | 0.0297 (7) | |
H10A | 0.2879 | 0.6667 | 1.0710 | 0.036* | |
H10B | 0.0940 | 0.6739 | 0.9760 | 0.036* | |
C11 | 0.1742 (4) | 0.57928 (15) | 0.9757 (4) | 0.0292 (7) | |
H11A | 0.1642 | 0.5667 | 1.0803 | 0.035* | |
H11B | 0.2735 | 0.5586 | 0.9710 | 0.035* | |
C12 | 0.0201 (4) | 0.55527 (13) | 0.8282 (3) | 0.0197 (6) | |
H12A | 0.0296 | 0.5087 | 0.8144 | 0.024* | |
H12B | −0.0793 | 0.5629 | 0.8529 | 0.024* | |
C13 | −0.6266 (3) | 0.35972 (13) | 0.2766 (4) | 0.0187 (6) | |
H13 | −0.6562 | 0.3776 | 0.1699 | 0.022* | |
C14 | −0.7074 (4) | 0.30477 (14) | 0.3003 (4) | 0.0216 (6) | |
H14 | −0.7920 | 0.2862 | 0.2091 | 0.026* | |
C15 | −0.6648 (4) | 0.27684 (14) | 0.4573 (4) | 0.0213 (6) | |
H15 | −0.7186 | 0.2393 | 0.4715 | 0.026* | |
C16 | −0.5407 (4) | 0.30559 (15) | 0.5931 (4) | 0.0232 (7) | |
H16 | −0.5118 | 0.2875 | 0.6994 | 0.028* | |
C17 | −0.4598 (3) | 0.36091 (13) | 0.5716 (4) | 0.0211 (6) | |
H17 | −0.3773 | 0.3800 | 0.6638 | 0.025* | |
N1 | −0.3331 (3) | 0.52294 (11) | 0.2782 (3) | 0.0170 (5) | |
N2 | −0.4455 (3) | 0.47305 (11) | 0.2407 (3) | 0.0190 (5) | |
N3 | −0.2852 (3) | 0.47484 (10) | 0.5218 (3) | 0.0173 (5) | |
N4 | −0.2022 (3) | 0.61279 (11) | 0.2114 (3) | 0.0202 (5) | |
S1 | 0.04561 (9) | 0.67369 (3) | 0.46182 (9) | 0.0205 (3) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0188 (14) | 0.0123 (13) | 0.0200 (14) | 0.0057 (10) | 0.0089 (11) | 0.0046 (10) |
C2 | 0.0157 (14) | 0.0168 (13) | 0.0145 (13) | 0.0021 (10) | 0.0044 (11) | −0.0027 (10) |
C3 | 0.0148 (13) | 0.0135 (13) | 0.0187 (14) | 0.0013 (10) | 0.0039 (11) | −0.0001 (10) |
C4 | 0.0193 (14) | 0.0158 (13) | 0.0182 (14) | 0.0036 (11) | 0.0072 (11) | 0.0012 (11) |
C5 | 0.0211 (15) | 0.0189 (14) | 0.0198 (15) | −0.0025 (11) | 0.0057 (12) | 0.0000 (11) |
C6 | 0.0203 (15) | 0.0161 (13) | 0.0201 (15) | 0.0041 (11) | 0.0075 (12) | 0.0011 (11) |
C7 | 0.0173 (14) | 0.0171 (14) | 0.0169 (14) | 0.0017 (11) | 0.0055 (11) | −0.0026 (11) |
C8 | 0.0173 (14) | 0.0144 (13) | 0.0216 (15) | 0.0029 (11) | 0.0048 (12) | −0.0019 (11) |
C9 | 0.0213 (15) | 0.0206 (15) | 0.0240 (16) | −0.0038 (11) | 0.0058 (12) | −0.0015 (11) |
C10 | 0.0335 (18) | 0.0271 (16) | 0.0208 (16) | −0.0066 (14) | 0.0015 (14) | −0.0032 (13) |
C11 | 0.0303 (18) | 0.0312 (17) | 0.0210 (16) | −0.0031 (14) | 0.0037 (14) | 0.0018 (13) |
C12 | 0.0223 (15) | 0.0164 (14) | 0.0181 (14) | −0.0019 (11) | 0.0049 (12) | −0.0027 (11) |
C13 | 0.0188 (15) | 0.0186 (14) | 0.0174 (14) | −0.0007 (11) | 0.0054 (11) | −0.0009 (11) |
C14 | 0.0193 (15) | 0.0258 (15) | 0.0204 (15) | −0.0018 (12) | 0.0081 (12) | −0.0041 (12) |
C15 | 0.0245 (15) | 0.0165 (14) | 0.0254 (16) | 0.0010 (11) | 0.0123 (13) | 0.0011 (11) |
C16 | 0.0215 (16) | 0.0263 (16) | 0.0201 (15) | −0.0030 (12) | 0.0059 (12) | 0.0042 (12) |
C17 | 0.0174 (15) | 0.0238 (15) | 0.0194 (15) | −0.0007 (12) | 0.0039 (12) | 0.0028 (12) |
N1 | 0.0164 (12) | 0.0163 (11) | 0.0172 (12) | −0.0049 (9) | 0.0047 (10) | −0.0015 (9) |
N2 | 0.0189 (12) | 0.0180 (12) | 0.0182 (12) | −0.0019 (9) | 0.0048 (10) | −0.0020 (9) |
N3 | 0.0186 (12) | 0.0141 (11) | 0.0192 (12) | 0.0012 (9) | 0.0071 (10) | 0.0012 (9) |
N4 | 0.0206 (13) | 0.0204 (12) | 0.0178 (12) | 0.0017 (10) | 0.0050 (10) | 0.0032 (9) |
S1 | 0.0209 (4) | 0.0173 (4) | 0.0224 (4) | −0.0018 (3) | 0.0071 (3) | 0.0017 (3) |
C1—C6 | 1.389 (4) | C9—H9A | 0.9700 |
C1—C2 | 1.420 (4) | C9—H9B | 0.9700 |
C1—C7 | 1.433 (4) | C10—C11 | 1.524 (4) |
C2—N3 | 1.329 (3) | C10—H10A | 0.9700 |
C2—N1 | 1.380 (3) | C10—H10B | 0.9700 |
C3—N2 | 1.336 (4) | C11—C12 | 1.535 (4) |
C3—N3 | 1.369 (3) | C11—H11A | 0.9700 |
C3—C4 | 1.461 (4) | C11—H11B | 0.9700 |
C4—C17 | 1.395 (4) | C12—H12A | 0.9700 |
C4—C13 | 1.395 (4) | C12—H12B | 0.9700 |
C5—N4 | 1.311 (4) | C13—C14 | 1.380 (4) |
C5—N1 | 1.379 (3) | C13—H13 | 0.9300 |
C5—H5 | 0.9300 | C14—C15 | 1.383 (4) |
C6—N4 | 1.365 (4) | C14—H14 | 0.9300 |
C6—S1 | 1.731 (3) | C15—C16 | 1.386 (4) |
C7—C8 | 1.360 (4) | C15—H15 | 0.9300 |
C7—C12 | 1.504 (4) | C16—C17 | 1.380 (4) |
C8—C9 | 1.503 (4) | C16—H16 | 0.9300 |
C8—S1 | 1.739 (3) | C17—H17 | 0.9300 |
C9—C10 | 1.537 (4) | N1—N2 | 1.363 (3) |
C6—C1—C2 | 115.3 (3) | H10A—C10—H10B | 108.0 |
C6—C1—C7 | 113.5 (2) | C10—C11—C12 | 111.8 (3) |
C2—C1—C7 | 131.2 (2) | C10—C11—H11A | 109.3 |
N3—C2—N1 | 109.3 (2) | C12—C11—H11A | 109.3 |
N3—C2—C1 | 134.9 (3) | C10—C11—H11B | 109.3 |
N1—C2—C1 | 115.8 (2) | C12—C11—H11B | 109.3 |
N2—C3—N3 | 115.8 (2) | H11A—C11—H11B | 107.9 |
N2—C3—C4 | 121.5 (2) | C7—C12—C11 | 111.6 (2) |
N3—C3—C4 | 122.7 (2) | C7—C12—H12A | 109.3 |
C17—C4—C13 | 118.9 (2) | C11—C12—H12A | 109.3 |
C17—C4—C3 | 119.9 (3) | C7—C12—H12B | 109.3 |
C13—C4—C3 | 121.2 (3) | C11—C12—H12B | 109.3 |
N4—C5—N1 | 121.0 (3) | H12A—C12—H12B | 108.0 |
N4—C5—H5 | 119.5 | C14—C13—C4 | 119.9 (3) |
N1—C5—H5 | 119.5 | C14—C13—H13 | 120.1 |
N4—C6—C1 | 127.6 (3) | C4—C13—H13 | 120.1 |
N4—C6—S1 | 121.4 (2) | C15—C14—C13 | 121.2 (3) |
C1—C6—S1 | 111.0 (2) | C15—C14—H14 | 119.4 |
C8—C7—C1 | 111.1 (2) | C13—C14—H14 | 119.4 |
C8—C7—C12 | 122.8 (2) | C14—C15—C16 | 119.0 (3) |
C1—C7—C12 | 126.1 (2) | C14—C15—H15 | 120.5 |
C7—C8—C9 | 125.0 (3) | C16—C15—H15 | 120.5 |
C7—C8—S1 | 113.3 (2) | C17—C16—C15 | 120.5 (3) |
C9—C8—S1 | 121.7 (2) | C17—C16—H16 | 119.8 |
C8—C9—C10 | 109.4 (2) | C15—C16—H16 | 119.8 |
C8—C9—H9A | 109.8 | C16—C17—C4 | 120.5 (3) |
C10—C9—H9A | 109.8 | C16—C17—H17 | 119.7 |
C8—C9—H9B | 109.8 | C4—C17—H17 | 119.7 |
C10—C9—H9B | 109.8 | N2—N1—C5 | 125.3 (2) |
H9A—C9—H9B | 108.2 | N2—N1—C2 | 110.3 (2) |
C11—C10—C9 | 111.2 (3) | C5—N1—C2 | 124.5 (2) |
C11—C10—H10A | 109.4 | C3—N2—N1 | 101.6 (2) |
C9—C10—H10A | 109.4 | C2—N3—C3 | 103.0 (2) |
C11—C10—H10B | 109.4 | C5—N4—C6 | 115.7 (2) |
C9—C10—H10B | 109.4 | C6—S1—C8 | 91.09 (13) |
C6—C1—C2—N3 | 179.6 (3) | C3—C4—C13—C14 | 178.9 (2) |
C7—C1—C2—N3 | −1.3 (5) | C4—C13—C14—C15 | −0.6 (4) |
C6—C1—C2—N1 | −0.9 (3) | C13—C14—C15—C16 | 1.2 (4) |
C7—C1—C2—N1 | 178.1 (3) | C14—C15—C16—C17 | −0.6 (4) |
N2—C3—C4—C17 | 179.3 (2) | C15—C16—C17—C4 | −0.5 (4) |
N3—C3—C4—C17 | 0.2 (4) | C13—C4—C17—C16 | 1.1 (4) |
N2—C3—C4—C13 | −0.1 (4) | C3—C4—C17—C16 | −178.3 (3) |
N3—C3—C4—C13 | −179.3 (2) | N4—C5—N1—N2 | −179.1 (2) |
C2—C1—C6—N4 | 0.6 (4) | N4—C5—N1—C2 | 0.3 (4) |
C7—C1—C6—N4 | −178.7 (3) | N3—C2—N1—N2 | −0.4 (3) |
C2—C1—C6—S1 | 179.33 (19) | C1—C2—N1—N2 | −180.0 (2) |
C7—C1—C6—S1 | 0.1 (3) | N3—C2—N1—C5 | −179.9 (2) |
C6—C1—C7—C8 | 0.5 (3) | C1—C2—N1—C5 | 0.5 (4) |
C2—C1—C7—C8 | −178.5 (3) | N3—C3—N2—N1 | 0.3 (3) |
C6—C1—C7—C12 | 178.1 (2) | C4—C3—N2—N1 | −179.0 (2) |
C2—C1—C7—C12 | −1.0 (5) | C5—N1—N2—C3 | 179.5 (2) |
C1—C7—C8—C9 | 176.4 (2) | C2—N1—N2—C3 | 0.1 (3) |
C12—C7—C8—C9 | −1.2 (4) | N1—C2—N3—C3 | 0.5 (3) |
C1—C7—C8—S1 | −1.0 (3) | C1—C2—N3—C3 | 180.0 (3) |
C12—C7—C8—S1 | −178.6 (2) | N2—C3—N3—C2 | −0.5 (3) |
C7—C8—C9—C10 | −17.3 (4) | C4—C3—N3—C2 | 178.7 (2) |
S1—C8—C9—C10 | 159.9 (2) | N1—C5—N4—C6 | −0.7 (4) |
C8—C9—C10—C11 | 47.7 (3) | C1—C6—N4—C5 | 0.3 (4) |
C9—C10—C11—C12 | −62.6 (4) | S1—C6—N4—C5 | −178.4 (2) |
C8—C7—C12—C11 | −11.0 (4) | N4—C6—S1—C8 | 178.3 (2) |
C1—C7—C12—C11 | 171.7 (3) | C1—C6—S1—C8 | −0.5 (2) |
C10—C11—C12—C7 | 42.0 (3) | C7—C8—S1—C6 | 0.9 (2) |
C17—C4—C13—C14 | −0.6 (4) | C9—C8—S1—C6 | −176.6 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5···N2i | 0.93 | 2.50 | 3.413 (3) | 166 |
C11—H11B···N2ii | 0.97 | 2.82 | 3.653 (5) | 144 |
Symmetry codes: (i) −x−1, −y+1, −z; (ii) −x, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C17H14N4S |
Mr | 306.38 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 296 |
a, b, c (Å) | 8.6239 (16), 20.512 (4), 8.5952 (16) |
β (°) | 111.975 (3) |
V (Å3) | 1410.0 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.23 |
Crystal size (mm) | 0.18 × 0.16 × 0.16 |
Data collection | |
Diffractometer | Bruker SMART APEX CCD detector diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 1998) |
Tmin, Tmax | 0.960, 0.964 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 8272, 3042, 2345 |
Rint | 0.057 |
(sin θ/λ)max (Å−1) | 0.639 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.060, 0.202, 1.25 |
No. of reflections | 3042 |
No. of parameters | 199 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.72, −0.66 |
Computer programs: SMART (Bruker, 1998), SAINT-Plus (Bruker, 1998), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and CAMERON (Watkin et al., 1996), WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5···N2i | 0.93 | 2.50 | 3.413 (3) | 166 |
C11—H11B···N2ii | 0.97 | 2.82 | 3.653 (5) | 144 |
Symmetry codes: (i) −x−1, −y+1, −z; (ii) −x, −y+1, −z+1. |
Acknowledgements
NSB is thankful to the University Grants Commission (UGC), India, for financial assistance and the Department of Science and Technology, (DST), India, for the data-collection facility under the IRHPA–DST program.
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The Chemistry of thiophenes and benzothiophenes is well documented in the literature and has drawn much attention because of their wide spectrum of biological activities (Shishoo et al., 1992). Pyrimidines and triazolopyrimidines are also associated with diverse biological activities (Bradbury et al., 1991; Elslager et al., 1981). In view of the pharmacological significance of thiophene and pyrimidine derivatives in well known drugs such as coramine (Yunosov et al., 1966), antipyrine (Blain et al., 1982) and also in continuation of our work on biologicallyactive nitrogen and sulfur heterocycles. In the title compound, the benzothieno moiety is fused at one end of the pyramidine ring and the triazole ring with a phenyl substituent is fused at the other side. The fused triazole-pyrimidine-benzotheino and the phenyl ring is coplanar with the dihedral angle 2.584 (3)°. The triazole ring is essentially planar similar to those reported earlier (Belcher & Squattrito, 2006; Buzykin et al., 2008) with maximum deviation of atomsfrom their mean statistical planes being 0.0028 (3) Å. The N(1), atom of the triazole ring is in planar trigonal configuration similar to those reported earlier (Lipson et al., 2006). The N(1)—N(2) bond length in the triazole ring is shorter {1.362 (4)Å} than the distance characteristic of a single N—N bond (1.47 Å). The N—C and N—N distances in the triazole ring vary from 1.36 (2) Å to 1.38 (4) Å respectively. The cyclohexene ring is in half-chair conformation. The plane calculation shows that the atoms C10 and C11 deviate from the mean plane C7/C8/C9/C12 constituting the ring by -0.358 (4)Å and 0.302 (4) Å,respectively, indicating that the conformation of the ring is that of a half-chair, with the atoms C10 and C11 being displaced by this overall planarity of the rest of the ring. The ring puckering parameters for the cyclohexene ring in the title compound are Q(2) = 0.3816 (3)Å, ϕ(2) = 23.08 (5)° and θ= 129.07 (4)° respectively. In most of the benzotheino ring systems the cyclohexyl ring adopts half-chair conformation (Akkurt et al., 2008; Harrison et al., 2006). The crystal structure is stabilized by two C—H···N intermolecular interactions. One of the C—H···N interaction links the molecules into head-head centrosymmetric dimers corresponding to graph set notation R22(8) (Bernstein et al., 1995) (Fig 2), while the other C—H···N interaction interaction generates chain of molecules in a zig-zag tape like pattern along c axis (Fig 2). Additionally, the supramolecular assembly is further stabilized by π–π stacking interaction between the pyrimidine and phenyl rings. The C2—C4 (-x - 1,1 - y,1 - z) disposed at a distance of 3.445 (4)Å.