ethyl 3(S)-(2,3-dihydro-benzofuran-6-yl)-3-{2-oxo-3-[3-(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-yl)-propyl]-tetrahydro-pyrimidin-1-yl}-propionate 、
sodium hydroxide 在
silica gel 、 EtOAc EtOH H2O NH4OH 作用下,
以
乙醇 为溶剂,
反应 2.0h,
以to give 4-13 as a white solid的产率得到3(S)-(2,3-dihydro-benzofuran-6-yl)-3-{2-oxo-3-[3-(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-yl)-propyl]-tetrahydro-pyrimidin-1-yl}-propionic acid