(2S)-5-amino-2-[({2-oxo-1-[2-(trifluoromethyl)benzyl]-1,2-dihydropyridin-3-yl}carbonyl)amino]pentanoic acid trifluoroacetate   、                                                                                      
乙醇   、                                                                                      
乙基乙酰亚胺盐酸盐                                                                                                                                                                                              以
                                                                                         
三乙胺                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以to give (2S)-5-(ethanimidoylamino)-2-[({2-oxo-1-[2-(trifluoromethyl)benzyl]-1,2-dihydropyridin-3-yl}carbonyl)amino]pentanoic acid•TFA (107, 0.170 g) as a white solid的产率得到(2S)-5-(ethanimidoylamino)-2-[({2-oxo-1-[2-(trifluoromethyl)benzyl]-1,2-dihydropyridin-3-yl}carbonyl)amino]pentanoic acid trifluoroacetate