Enantioselective Cyclopropanation of Allylic Alcohols. The Effect of Zinc Iodide
作者:Scott E. Denmark、Stephen P. O'Connor
DOI:10.1021/jo9702397
日期:1997.5.1
catalytic, enantioselective cyclopropanation of allylicalcohols is examined with bis(iodomethyl)zinc as the reagent and bis-methanesulfonamide 7 as the catalyst. Significant rate enhancement was observed when 1 equiv of zinc iodide was present, but more importantly, the enantiomeric excess of the product cyclopropane increased from 80% to 89% for the substrate cinnamyl alcohol. Reaction studies and spectroscopic