(1R,3S)-1-benzyl-6,7-dimethoxy-3-[(5R)-4-methoxy-6-methyl-5,6,7,8-tetrahydro[1,3]dioxolo[4,5-g]isoquinolin-5-yl]-1,3-dihydro-2-benzofuran-1-ol 在
对甲苯磺酸 作用下,
以
甲苯 为溶剂,
反应 3.0h,
以80%的产率得到(5R)-5-[(1S)-4,5-dimethoxy-3-[(Z)-phenylmethylidene]-2-benzofuran-1(1H)-yl]-4-methoxy-6-methyl-5,6,7,8-tetrahydro[1,3]dioxolo[4,5-g]isoquinoline