6,7-Dimethoxy-2-methyl-1-(2,3-dimethoxy-benzyl)-1,2,3,4-tetrahydro-isochinolincarbonsaeure-(1)-methylester 在
PPA 作用下,
以
二甲基亚砜 为溶剂,
生成 6,7-Dihydroxy-2-methyl-1-(2',3'-dihydroxy-benzyl)-1,2,3,4-tetrahydro-isochinolincarbonsaeure-(1)-lacton-(1,2')-monomethylether