Acta Cryst. (2011). E67, o2106 [ doi:10.1107/S1600536811027152 ]
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-HO hydrogen bonds between the amine and ester groups. Intermolecular C-HN hydrogen bonds and C-H interactions involving the thiophene ring are also observed.
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