Enantioselective synthesis of .beta.-hydroxy .delta.-lactones: a new approach to the synthetic congeners of 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors
作者:G. Bhaskar Reddy、Tatsuya Minami、Takeshi Hanamoto、Tamejiro Hiyama
DOI:10.1021/jo00020a008
日期:1991.9
Chiral beta,delta-diketo esters derived from Taber's chiral alcohol or its enantiomer were reduced either in one step (Et2BOMe, NaBH4, THF-MeOH) or in two steps (2 equiv HAl(i-Bu)2, THF; Et2BOMe, NaBH4, THF-MeOH) to give syn-beta,delta-dihydroxy esters with high diastereoselectivity. Hydrolysis of the esters followed by lactonization afforded the title lactones of high optical purity ranging from 49 to > 97% ee.