This invention relates to the preparation of highly pure (>99%) 4-(4-methyl piperazinomethyl) benzoic acid dihydrochloride (I) from commercially available and inexpensive starting materials with enhanced yields. Thus title compound (I) is prepared by the reaction of 4-bromomethyl benzoic acid (II) with 1-methyl piperazine in potassium carbonate presence and in n-butanol medium at room temperature. This invention also provides process for the preparation of 4-bromomethyl benzoic acid (II)
                            本发明涉及从商业上可获得的廉价起始材料中制备高纯度(> 99%)4-(4-甲基
哌嗪甲基)
苯甲酸二盐酸盐(I)的方法,并提高了产量。因此,通过在室温下在
钾碳酸盐存在下,在
正丁醇介质中将4-
溴甲基苯甲酸(II)与1-甲基
哌嗪反应来制备标题化合物(I)。本发明还提供了制备4-
溴甲基苯甲酸(II)的方法。