Enantioenriched spiro-oxiranes bearing three contiguous stereocenters were synthesized using a rhodium-catalyzed asymmetric addition/aldol/spirocyclization sequence. Starting from a linear substrate, the cascade enabled the formation of a spirocyclic framework in a single step. sp2- and sp-hybridized carbon nucleophiles were found to be competent initiators for this cascade, giving arylated or alkynylated
使用
铑催化的不对称加成/羟醛/螺环化序列合成了带有三个连续立体中心的对映体富集的螺环
环氧乙烷。从线性底物开始,级联能够在一步中形成螺环骨架。发现 sp 2 - 和 sp 杂化的碳亲核试剂是该级联反应的有效
引发剂,分别产生芳基化或炔基化产物。衍生化研究证明了产物的
环氧化物和
炔烃部分的合成多功能性。DFT 计算用于调和在产品的溶液和固态结构之间观察到的光谱差异。