(-)-(3S)-3-(tert-butyldimethylsilyloxy)-4,4-dimethyl-5-oxoheptanoic acid 2-(2-methyloxiranyl)ethyl ester 在
二氯二茂锆 、 silver perchlorate 作用下,
以
二氯甲烷 为溶剂,
反应 0.75h,
以93%的产率得到(-)-(5S)-5-(tert-butyldimethylsilyloxy)-4,4-dimethyl-6-(5-methyl-2,7,8-trioxabicyclo[3.2.1]oct-1-yl)hexan-3-one