Enantioselective Synthesis of Spiro‐oxiranes: An Asymmetric Addition/Aldol/Spirocyclization Domino Cascade
作者:Ken‐Loon Choo、Bijan Mirabi、Karl Z. Demmans、Mark Lautens
DOI:10.1002/anie.202105562
日期:2021.9.20
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。