propan-2-yl (3R,5S,8R,9S,10S,13R,14S,17R)-2'-chloro-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]spiro[1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthrene-3,3'-oxirane]-2'-carboxylate                                                                                                                                                                                              以
                                                                                         
甲醇   、                                                                                         
正辛烷   、                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                    反应 6.0h,
                                                                                                                生成                                                 
3'-methoxyspiro<5α-cholestane-3α:2'-oxirane>-3'-carboxylate d'isopropyle