A convenient synthesis of azomethine imines and their cycloaddition reactions with some dipolarophiles

摘要

Azomethine imines (4a-c) were prepared as 1,3-dipolar structures, from known compounds 5-phenylpyrazolidine-3-one (3) and acetone, thiobenzophenone or benzaldehyde. From the reaction of the 1,3-dipoles (4a-c) with methyl acrylate, ethyl acrylate, phenylisocyanate, N-phenylalemide, acetylenedicarboxylate and ethyl propiolate products (5-12) were obtained as cyclo-adduct compounds.