(+/-)-4-(2-Oxo-1,2,3,4,4a,5,6,7-octahydroquinolin-8-yl)butan-2-one. A Michael-reaction adduct from acid-catalyzed alkylation of a bicyclic enamide

The title racemate, C13H19NO2, was isolated from the Michael condensation of methyl vinyl ketone with 3,4,5,6,7,8-hexa­hydro-2-quinolone under acidic conditions. The compound aggregates as dimers by centrosymmetric hydrogen-bonded pairing of the carboxamide groups [N⋯O = 2.9321 (16) A and N—H⋯O = 174 (2)°]. The packing includes three close inter­molecular dipolar contacts, involving both O atoms.