申请人:Dr. Lo. Zambeletti S.p.A.
公开号:US04408074A1
公开(公告)日:1983-10-04
A process for preparing 1-(3,5-dimethoxy-4-hydroxy phenyl)-2-(N-methylamino) ethanol hydrochloride is described by reacting 2,6-dimethoxyphenol with anhydrous chloral in the presence of a catalyst, hydrolyzing 1-(3,5-dimethoxy-4-hydroxyphenyl)2,2,2-trichloro ethanol and subsequently isolating the 3,5-dimethoxy-4-hydroxyphenyl glyoxal thus obtained; finally, this compound, in the form of the bisulfite, is directly converted to the desired product by amination with methylamine in the presence of hydrogen with a hydrogenation catalyst and the final product is converted into the hydrochloride.
本发明提供了一种制备1-(3,5-二甲氧基-4-羟基苯基)-2-(N-甲基氨基)乙醇盐酸盐的方法,包括在催化剂存在下将2,6-二甲氧基苯与无水氯醛反应,水解1-(3,5-二甲氧基-4-羟基苯基)2,2,2-三氯乙醇,然后分离所得的3,5-二甲氧基-4-羟基苯基甘醛;最后,在氢气存在下,用甲胺进行氨基化反应,并使用氢化催化剂将该化合物以亚硫酸氢盐的形式直接转化为所需产物,并将最终产物转化为盐酸盐。