(-)-(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