The Claisen rearrangement of alkenyl-substituted ketene acetals (produced in situ by selenoxide elimination from the corresponding phenylselenoacetaldehyde-derived acetals of enantiomerically pure 1,3-diol derivatives) afforded unsaturated eight-membered lactones with control of stereochemistry of methyl substituents at C-4, C-5 and C-7, as well as a fused system.
烯基取代的乙酮的克莱森重排(从对映体纯度为 1,3 二醇衍
生物的相应苯基
硒乙醛衍生的
乙醛中通过
硒氧化消除原位生成)得到了不饱和的八元内酯,其 C-4、C-5 和 C-7 甲基取代基的立体
化学受到控制,还得到了一个融合体系。