The invention relates to a process for the preparation of trans 4-amino-cyclohexil ethyl acetate HCl wherein
d) hydrogenating 4-nitrophenyl acetic acid in a protic solvent at a temperature between 40-50° C. in the presence of Pd/C under 0.1-0.6 bar overpressure, and
e) further hydrogenating the 4-aminophenyl acetic acid obtained in situ in step a) at a temperature between 50-60° C. under 1-4 bar overpressures, then
f) heating to reflux the 4-aminocyclohexil acetic acid obtained in step b) for 1-3 hours in hydrochloric ethanol, and if desired after removing the solvent acetonitrile was added to the residue obtained and distilled off.
本发明涉及一种制备转型4-
氨基
环己基乙酸乙酯盐酸盐的方法,其中a)在质子溶剂中在40-50°C的温度下,在Pd / C存在下,以0.1-0.6 bar的过压下,加
氢4-
硝基苯乙酸,然后b)在1-4 bar过压下,在50-60°C的温度下,进一步加
氢在步骤a)中得到的
4-氨基苯乙酸,然后c)将在步骤b)中得到的4-
氨基
环己基乙酸加热至回流状态,在
盐酸乙醇中进行1-3小时,如果需要,在去除溶剂后,可以向得到的残渣中加入
乙腈并蒸馏。