N-(ethoxycarbonylmethylene)-2-(3,4-dimethoxyphenyl)ethylamine 、
2,3,4,6-tetra-O-pivaloyl-α-D-galactopyranosyl bromide 在
2,6-二甲基吡啶 、
silver trifluoromethanesulfonate 作用下,
以
二氯甲烷 为溶剂,
反应 20.0h,
生成
ethyl (1S)-N-(2,3,4,6-tetra-O-pivaloyl-β-D-galactopyranosyl)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline-1-carboxylate 、 ethyl (1R)-N-(2,3,4,6-tetra-O-pivaloyl-β-D-galactopyranosyl)-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline-1-carboxylate