Hydrolysis of N,N-Dimethylenamines. Stereospecific Synthesis of Their Enol and Enol Ester Derivatives

Stereospecific conversions of dimethylaminomethylidene group in various (Z)-alkyl 2-[(2,2-disubstituted ethenyl)amino]-3-dimethylaminopropenoates into their hydroxymethylidene and benzoyloxy methylidene derivatives were achieved in moderate to good yields. The difference between pathway to enol esters and (fused)pyrrole-2-carboxylate derivatives is clarified.