Ethyl 3-amino-6-phenyl-4-tolylthieno[2,3-b]pyridine-2-carboxylate.

Abstract

In the title compound, C(23)H(20)N(2)O(2)S, the central thienopyridine ring system is essentially planar, the dihedral angle between the planes of the two rings being 0.3 (2) degrees. The terminal ethyl carboxylate group is twisted by 26.7 (3) degrees away from the central ring system. A short intramolecular hydrogen bond involving the amino N atom and the carbonyl O atom [N...O = 2.806 (4) A] forms a pseudo-six-membered ring. Significant intermolecular C-H...N, C-H...O and C-H...pi interactions contribute strongly to the stability of the structure, along with weak pi-pi-stacking interactions.