[(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