(1S,2R,4S,6S,7R)-4-Butyryl-7,10,10-trimethyl-3-oxa-5-aza-tricyclo[5.2.1.0
2,6]decane-5-carboxylic acid tert-butyl ester   、                                                                                      alkaline earth salt of/the/ methylsulfuric acid                                                                                                                                                                                              以
                                                                                         
四氢呋喃   、                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                生成                                                 
(1S,2R,4S,6S,7R)-4-((R)-1-Ethyl-1-hydroxy-butyl)-7,10,10-trimethyl-3-oxa-5-aza-tricyclo[5.2.1.02,6]decane-5-carboxylic acid tert-butyl ester