(S)-tert-butyl 3-(4-chlorophenyl)-1-oxo-1-(3-(pyridin-4-yl)isoxazol-5-ylamino)propan-2-ylcarbamate trifluoroacetic acid salt   、                                                                                      
三氟乙酸                                                                                                                                                                                              以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                以to give (S)-2-amino-3-(4-chlorophenyl)-N-(3-(pyridin-4-yl)isoxazol-5-yl)propanamide TFA salt 3.1.C as a light yellow solid (250 mg, 100% yield)的产率得到(S)-2-amino-3-(4-chlorophenyl)-N-(3-(pyridin-4-yl)isoxazol-5-yl)propanamide trifluoroacetic acid salt