Meth­yl 4-(3-chloro­phen­yl)-2,7,7-trimeth­yl-5-oxo-1,4,5,6,7,8-hexa­hydro­quinoline-3-carboxyl­ate

The title compound, C₂₀H₂₂ClNO₃, was synthesized by the reaction of 3-chloro­benzaldehyde, 5,5-dimeth­yl-1,3-cyclo­hexane­dione and meth­yl 2-amino­crotonate in an ionic liquid medium. The X-ray analysis reveals that the nitro­gen-containing ring adopts a boat conformation and the cyclo­hexene ring has a half-chair conformation. Inter­molecular N—H...O bonds in the structure lead to the formation of chains.