4-(2-chloroethyl)-6,7-dimethoxy-isoquinoline 、 2-[3-(pyrid-3-yl)-propyl]-6,7-dimethoxy-1-oxo-1,2,3,4-tetrahydro-isoquinoline 以34%的产率得到2-[3-(N-(2-(6,7-Dimethoxy-isoquinol-4-yl)-ethyl)-piperidin-3-yl)-propyl]-6,7-dimethoxy-1-oxo-1,2,3,4-tetrahydro-isoquinoline-dihydrochloride-monohydrate