N-substituted 1,4-dihydropyridines bearing a carboxyl group at the 4-position were synthesized in solvent-free conditions with Cu2+ as the catalyst, imine and β-ketoester as starting materials. The possible mechanism which consists of addition-rearrangement process was proposed and examined by the reaction of isolated product of first addition to β- ketoester.
以Cu2+为催化剂,
亚胺和β-
酮酯为原料,在无溶剂条件下合成了4位带有羧基的N-取代1,4-
二氢吡啶。通过首次加成到β-
酮酯的分离产物的反应,提出并检验了由加成-重排过程组成的可能机制。