(1R,2S,5S)-N-(4-amino-1-cyclopropyl-3,4-dioxobutan-2-yl)-3-[(2S)-2-isocyanato-3,3-dimethylbutanoyl]-6,6-dimethyl-3-azabicyclo[3.1.0]hexane-2-carboxamide   、                                                                                      
(S)-3-((2-amino-2-cyclohexylethyl)(methyl)amino)-4-(dimethylamino)cyclobut-3-ene-1,2-dione hydrochloride                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以10%的产率得到(1R,2S,5S)-N-(4-amino-1-cyclopropyl-3,4-dioxobutan-2-yl)-3-[(2S)-2-[[(1S)-1-cyclohexyl-2-[[2-(dimethylamino)-3,4-dioxocyclobuten-1-yl]-methylamino]ethyl]carbamoylamino]-3,3-dimethylbutanoyl]-6,6-dimethyl-3-azabicyclo[3.1.0]hexane-2-carboxamide