Mn(III)-Based Oxidative Free-Radical Cyclizations of Substituted Allyl α-Methyl-β-ketoesters: Syntheses, DFT Calculations, and Mechanistic Studies
作者:Kuangsen Sung、Yu Yuan Wang
DOI:10.1021/jo026681t
日期:2003.4.1
stereoselectivity of the cyclizations depends on relative stability of the cyclization-generated radicals. Therefore, the oxidative free-radical cyclization of allyl alpha-methyl-beta-ketoester 5a with Mn(OAc)(3) gives a cis product as a major product, while the same oxidative free-radical cyclizations of substitutedallyl alpha-methyl-beta-ketoesters 5b and 5c with Mn(OAc)(3) produce trans products as major