2-[(2'S,4aS,5S,8R,8aS)-5-hydroxy-2',4,4,8a-tetramethyl-7-methylidenespiro[1,2,3,4a,5,6-hexahydronaphthalene-8,5'-oxolane]-2'-yl]acetic acid                                                                                                                                                              在
                                                                                                                                                                                 
氨   、                                                                                                  
sodium   、                                                                                                  sodium hydride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                    反应 4.5h,
                                                                                                                生成                                                 
(S)-3-Hydroxy-5-((4S,4aS,8aS)-4-hydroxy-2,5,5,8a-tetramethyl-3,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-3-methyl-pentanoic acid methyl ester