In the presence of a palladium catalyst, treatment of γ-acyloxy-α,β-unsaturated ketone with bis(iodozincio)methane caused umpolung of π-allylpalladium to give a zinc dienolate. Thus formed zinc species afforded a cyclohexene derivative via a self-condesation reaction. It is noteworthy that the three adjacent stereogenic centers were created in a single process with quite high diastereoselectivity.
在
钯催化剂的存在下,用下列方法处理γ-酰氧基-α,β-不饱和酮 双
碘甲烷引起π-烯丙基铝的蛋白沉淀,得到二烯酸
锌。如此形成的
锌物质通过自缩合反应得到
环己烯衍
生物。值得注意的是,三个相邻的立体异构中心是在单一过程中以非对映选择性很高的方式创建的。