ethyl [4-[1-[3-methoxy-4-[N'-(2-methylphenyl)ureido]phenylacetyl]-(3R,4S)-isopropylidenedioxy-(2S)-pyrrolidinylcarbonyl]-1-piperazinyl]acetate                                                                                                                                                              在
                                                                                                                                                                                 
sodium hydroxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃   、                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 5.0h,
                                                                                                                以37%的产率得到2-(4-{[(3aR,4S,6aS)-5-[2-(3-methoxy-4-{[(2-methylphenyl)carbamoyl]amino}phenyl)acetyl]-2,2-dimethyl-hexahydro-[1,3]dioxolo[4,5-c]pyrrol-4-yl]carbonyl}piperazin-1-yl)acetic acid