A Practical New Chiral Controller for Asymmetric Diels−Alder and Alkylation Reactions
作者:Georgios Sarakinos、E. J. Corey
DOI:10.1021/ol991007s
日期:1999.12.1
prepared from 1,2-epoxycyclohexane by a simple and practical procedure. The acrylate esters of these alcohols undergo BCl3-catalyzed Diels-Alderreactions with a variety of dienes at -78 to -55 degrees C in CH2Cl2 or C7H8 with high dienophile face selectivity (Table 1). The chiral esters so formed are readily cleaved with recovery of the controllers (+)- or (-)-2. Esters of (+)- and (-)-2 can be converted