Adil Boughaleb, H. Zouihri, S. Gmouh
Jul 23, 2011
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Journal
Acta Crystallographica Section E: Structure Reports Online
Abstract
The title heterocyclic compound, C20H17NO3S, was synthesized by condensation of ethyl cyanoacetate with (Z)-2-benzylidenebenzo[b]thiophen-3(2H)-one in the presence of a basic catalyst in ethanol. The phenyl and ester groups make dihedral angles of 77.67 (6) and 8.52 (6)°, respectively, with the benzothienopyran ring system [maximum r.m.s. deviation = 0.1177 (13) Å]. In the crystal, centrosymmetric dimers are formed through pairs of N—H⋯O hydrogen bonds between the amine and ester groups. Intermolecular C—H⋯N hydrogen bonds and C—H⋯π interactions involving the thiophene ring are also observed.