The cobalt-catalyzed cyclization of certain acyclic enediene substrates proceeds stereoselectively to afford substituted divinyl cyclopentanes and cyclohexanes in good yield. A variation, involving a substrate wherein a suitably disposed alkyne separates the reacting alkene and 1,3-diene partners, affords a novel cascade cyclization product.
某些无环烯二烯底物的
钴催化环化选择性进行,以高收率得到取代的二
乙烯基环戊烷和
环己烷。涉及底物的变体提供了新颖的级联环化产物,其中适当安置的
炔烃将反应的烯烃和1,3-二烯配偶体分开。