methyl (5S,10aR)-7,8-dimethoxy-3,10-dioxo-1,5,10,10a-tetrahydro-3H-oxazolo[3,4-b]isoquinoline-5-carboxylate 在
sodium tetrahydroborate 、 cerium(III) chloride 作用下,
以
四氢呋喃 、
甲醇 为溶剂,
反应 0.5h,
以92%的产率得到methyl (5S,10S,10aR)-10-hydroxy-7,8-dimethoxy-3-oxo-1,5,10,10a-tetrahydro-3H-oxazolo[3,4-b]isoquinoline-5-carboxylate