Dimethyl 8-acetyl-2-methyl-1,2-dihydroquinoline-2,4-dicarboxylate

Abstract

In the title compound, C16H17NO5, the six-membered N-containing ring has a half-boat form; the spiro C atom deviates by 0.34 (2) angstrom from the plane (r.m.s. deviation = 0.051 angstrom) defined by the N and four aromatic C atoms. Intramolecular N-H center dot center dot center dot O hydrogen bonding generates an S(6) ring motif and the dihedral angle between the mean plane though the S(6) ring and that through the five-atom half-boat plane is 3.39 (2)degrees. In the crystal, weak intermolecular C-H center dot center dot center dot O hydrogen bonds link molecules into zigzag chains along [001] due to c-glide symmetry, and C-H center dot center dot center dot pi interactions extend along [010].