Under very mild conditions heterocyclic secondary enamines react efficiently with malonyl chloride to produce hydroxylated 2-pyridinone-fused heterocycles. The reactions of enamines with oxalyl chloride, however, afford varied products depending upon the heterocyclic structure of the enamine. Whilst a C-acylated enamine and a lactam-fused heterocycle were obtained from the reaction of the five-and seven-membered heterocyclic ...
