Synthesis of substituted 1,2-dihydropyridinones is described in a one pot reaction of β-enaminones and acetylene dicarboxylates where new C-C and C-N bonds were formed. The title compounds were obtained in moderate to good yields.

An efficient synthetic protocol wasd eveloped for the formation of tetracyclic tetrahydro-b-carbolines using a p-toluenesulfonic acid-mediated reactiono fb-enaminones and acetylenedicarboxylates. Highly functionalised tetracyclic tetrahydro-b-carboline derivatives were synthesised under one-pot reaction conditions, in which two CÀCa nd one CÀN bonds were sequentially formed.[a] V.