四甲基甲烷二胺 、 2-(3',5'-di-tert-butyl-4'-hydroxyphenyl)-thiomethyl-3-ethoxycarbonyl-5-hydroxybenzofuran 以
1,4-二氧六环 为溶剂,
反应 3.0h,
以66.7%的产率得到2-(3,5-Di-tert-butyl-4-hydroxy-phenylsulfanylmethyl)-4-dimethylaminomethyl-5-hydroxy-benzofuran-3-carboxylic acid ethyl ester