new bifunctional C1 synthon: With bromomethyl silicate as a CH2 source, visible‐light‐induced cyclopropanation has been demonstrated to be amenable to the alkenes including Michael acceptors, styrene derivatives, and unactivated 1,1‐dialkyl ethylenes. In addition to the broad substrate scope, this radical‐polar crossover process is also characterized by its redox‐neutral process, mild conditions, and
Catalytic asymmetric Simmons–Smith cyclopropanation of unfunctionalized olefins
作者:Jiang Long、Haifeng Du、Kai Li、Yian Shi
DOI:10.1016/j.tetlet.2005.02.161
日期:2005.4
This paper describes a catalyticasymmetric cyclopropanation system for unfunctionalized olefins using readily available dipeptide N-Boc-l-Val-l-Pro-OMe (1) as ligand.