3(S)-isobutyl-5(S)-(2-methoxy-ethoxy)-tetrahydro-furan-2(S),4(S)-dicarboxylic acid 2-(tert-butoxycarbonyl-trityloxy-amide) 4-[(1-methylcarbamoyl-2(R)-phenyl-ethyl)amide]                                                                                                                                                              在
                                                                                                                                                                                 
三氟乙酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以83%的产率得到3(S)-isobutyl-5(S)-(2-methoxy-ethoxy)-tetrahydro-furan-2(S),4(S)-dicarboxylic acid 2-hydroxyamide 4-[(1-methylcarbamoyl-2(R)-phenyl-ethyl)amide]