甲基锂   、                                                                                      (3aR,4aS,8aS,9aS)-6-[1-Hydroxy-meth-(E)-ylidene]-2,2,4a,9,9-pentamethyl-octahydro-naphtho[2,3-d][1,3]dioxol-5-one                                                                                                                                                              在
                                                                                                                                                                                 
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                                                        以70%的产率得到(3aR,4aS,8aS,9aS)-6-[1-(tert-Butyl-dimethyl-silanyloxy)-meth-(E)-ylidene]-2,2,4a,5,9,9-hexamethyl-decahydro-naphtho[2,3-d][1,3]dioxol-5-ol