Carbohydrate derived 2-enono-δ-lactones, substituted at C-6, C-7 or C-8 with an electron-rich unsaturation, undergo efficient [2+2] intramolecular photocycloaddition to generate densely functionalized, fused carbocyclic systems.
碳水化合物衍生的2-烯-γ-内酯,在C-6、C-7或C-8位置被富电子的不饱和基取代,通过有效的[2+2]分子内光加合反应生成功能密集的稠
环烃系统。