2-Aza-1, 3-butadienes 2 and 5 were synthesized in good yields and on a large scale. Reaction of 2 and 5 with acid chlorides in the presence of triethylamine (Staudinger reaction) resulted in the highyielding formation of N-vinyl-and N-(1'-propenyl)-8-lactams. Excellent cis-stereoselectivity was observed in the reaction of a-aza-l, &butadienes 2 and 5 with Bose-Evans ketenes and Sheehan ketenes, whereas reaction with a Moore ketene ...
