二(对硝基苯)碳酸酯   、                                                                                      (2S)-5-(Carbamoylamino)-N-[4-(hydroxymethyl)phenyl]-2-[[(2S)-3-methyl-2-(pent-4-enoylamino)butanoyl]amino]pentanamide                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         N,N-dimethyl-d
6-formamide                                                                                  为溶剂,
                                                                                                                                                                                        以81%的产率得到[4-[[(2S)-5-(carbamoylamino)-2-[[(2S)-3-methyl-2-(pent-4-enoylamino)butanoyl]amino]pentanoyl]amino]phenyl]methyl (4-nitrophenyl) carbonate