methyl (1S)-1-[({(1S,2S,4S)-4-amino-2-hydroxy-1-[4-(5-methyl-2-pyridinyl)benzyl]-5-phenylpentyl}amino)carbonyl]-2,2-dimethylpropylcarbamate   、                                                                                      
(2S)-3,3-dimethyl-2-{3-[(2-methyl-1,3-thiazol-4-yl)methyl]-2-oxo-1-imidazolidinyl}butanoic acid trifluoroacetate                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺   、                                                                                                  
3-(二乙氧基邻酰氧基)-1,2,3-苯并三嗪-4-酮                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 16.0h,
                                                                                                                以60%的产率得到methyl (1S)-1-[({(1S,2S,4S)-4-[((2S)-3,3-dimethyl-2-{3-[(2-methyl-1,3-thiazol-4-yl)methyl]-2-oxo-1-imidazolidinyl}butanoyl)amino]-2-hydroxy-1-[4-(5-methyl-2-pyridinyl)benzyl]-5-phenylpentyl}amino)carbonyl]-2,2-dimethylpropylcarbamate