在
                                                                                                                                         palladium on activated charcoal                                                                                                                                                                                                                               
氢气   、                                                                                                  xylene                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 48.0h,
                                                                                                                生成                                                 tert-butyl (3S,6R,8aR)-6-[(2-methylpropan-2-yl)oxycarbonylamino]-5-oxospiro[2,3,6,7,8,8a-hexahydroindolizine-1,1'-cyclohexane]-3-carboxylate   、                                                                                             tert-butyl (3S,6S,8aR)-6-[(2-methylpropan-2-yl)oxycarbonylamino]-5-oxospiro[2,3,6,7,8,8a-hexahydroindolizine-1,1'-cyclohexane]-3-carboxylate