摘要:
Amino amides react as trinucleophiles with vinyl vicinal tricarbonyl esters. Reaction of the primary amino group takes place at the beta-position of the alpha,beta-unsaturated ketone along with addition to the central carbonyl group. In a third-stage reaction, the amide residue adds to the iminium ion formed from the intermediate carbinolamine. The resulting product is a bicyclic or tricyclic (acylamino)pyrrolidone carboxylate. A novel tricyclic 3-azadethiacepham of biological interest has been prepared using this reaction.