... Heterocyclic Chem., 19, 1355 (1982). ... follow- ed by ring closure via interaction of a carbonyl group with the other nucleophilic site, led to a number of acyl substi- tuted heterocycles such as ... (10) VP Arya, J. David, RS Grewal, SB Marathe and SD Patii, Indian J. Chem., 15b ...