7-(tert-butyl-dimethyl-silanyloxy)-3,5-dihydroxy-6,6-dimethyl-heptanoic acid ethyl ester 、
2,2-二甲氧基丙烷 在
4-甲基苯磺酸吡啶 作用下,
以
二氯甲烷 为溶剂,
以83%的产率得到(6-[2-(tert-butyl-dimethyl-silanyloxy)-1,1-dimethyl-ethyl]-2,2-dimethyl-[1,3]dioxan-4-yl)-acetic acid ethyl ester