(S)-2-{(2-Benzyloxycarbonylamino-ethyl)-[2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetyl]-amino}-3-[4-(2-tert-butoxycarbonylamino-ethoxy)-phenyl]-propionic acid methyl ester 、
三氟乙酸酐 以
二氯甲烷 为溶剂,
反应 48.0h,
以97%的产率得到(S)-3-[4-(2-Amino-ethoxy)-phenyl]-2-{(2-benzyloxycarbonylamino-ethyl)-[2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetyl]-amino}-propionic acid methyl ester; compound with trifluoro-acetic acid