反应条件
1: (1R)-1-[(3,4-dimethoxyphenyl)-methyl]-1,2,3,4-tetrahydro-6,7-dimethoxy-2-tert-butoxycarbonylethyl-isoquinoline oxalate With sodium hydroxide in water; toluene T=20°C; pH=9 - 10; 0.25 h; 2: benzenesulphonic acid methyl ester in acetonitrile T=30°C; 20 h;
