trans-N-methyl-3-<2-<(methoxycarbonyl)methyl>-4,5-(methylenedioxy)phenyl>-4-(methoxycarbonyl)-7,8-dimethoxy-3,4-dihydro-1(2H)-isoquinolone 在
sodium tetrahydroborate 、 triethyloxonium fluoroborate 作用下,
以52%的产率得到trans-N-methyl-3-<2-<(methoxycarbonyl)methyl>-4,5-(methylenedioxy)phenyl>-4-(methoxycarbonyl)-7,8-dimethoxy-1,2,3,4-tetrahydroisoquinoline