[(1S,2S,3R,4R,6R)-1-(tert-Butyl-dimethyl-silanyloxymethyl)-2,3-dihydroxy-4-methyl-6-vinyl-cyclohexyl]-carbamic acid tert-butyl ester 、
2,2-二甲氧基丙烷 在
(1S)-(+)-10-camphorsulfonic acid 作用下,
以
苯 为溶剂,
反应 1.0h,
以92%的产率得到[(3aS,4S,5R,7R,7aR)-4-(tert-Butyl-dimethyl-silanyloxymethyl)-2,2,7-trimethyl-5-vinyl-hexahydro-benzo[1,3]dioxol-4-yl]-carbamic acid tert-butyl ester