This invention relates to an improved process for synthesizing (±) 2-Amino-N-[2,(S,5-dimethoxyphenyl)-2-hydroxyethyl] acetamide monohydrochloride in good yield and in a cost effective manner from 1-(2,5dimethoxyphenyl)-2-bromoethanone by reacting the same with hexamine in the presence of novel solvent system comprising Tetrahydrofuran and water. The resulting aminoethanone is acylated with haloacetylchloride and sodium acetate in acetone-water solvent system. This product is reduced selectively first with sodium borohydride and subsequently with stannous chloride. This product is converted in situ to the corresponding hydrochloride salt immediately after reduction on its own.
                            这项发明涉及一种改进的工艺,用于从1-(2,5-二
甲氧基苯基)-2-
溴乙酮与
六胺在包含
四氢呋喃和
水的新型溶剂体系中反应,以高产率和经济有效的方式合成(±)2-
氨基-N-[2-(S,5-二
甲氧基苯基)-2-羟乙基]乙酰胺单盐酸盐。所得的
氨基乙酮在乙酮-
水溶剂体系中与卤代
乙酰氯和
醋酸钠酰化。这种产物首先选择性地用
硼氢化钠还原,随后用
氯化亚锡还原。该产物在还原后自行立即转化为相应的盐酸盐。