The present invention relates to a process for preparing hydrochloride salt of N-fatty acyl substituted amino acid ethyl ester. Said process includes the steps of: dissolving L-arginine ethyl ester dihydrochloride in distilled water with continuous agitation for a period of about 10 to about 20 minutes to obtain a clear solution; lowering the temperature of the clear solution to about 5° C. to about 10° C. to obtain a cooled solution; adjusting the pH of the cooled solution in the range of about 7 to about 8 by adding sodium hydroxide solution; adding at least one organic solvent to the clear solution with continuous agitation to obtain an intermediate mixture; condensing the intermediate mixture by simultaneously adding an acid halide and 20% sodium hydroxide solution at a temperature of about 7° C. to about 9° C. and at a pH in the range of about 7.2 to about 7.5 for about 2 hours to obtain a mixture; raising the temperature of the mixture to about 18 to about 20° C. followed by addition of sodium hydroxide to adjust the pH of the mixture to about 7.3; warming the mixture at a temperature of about 25 to about 30° C. to obtain a resultant mixture containing organic phase and aqueous phase; separating the organic phase and aqueous phase of the resultant mixture by settling the mixture; and distilling the organic phase under vacuum at a temperature of about 70° C. to about 75° C. to obtain a hydrochloride salt of ethyl lauroyl arginate.
本发明涉及一种制备N-脂肪酰基取代
氨基酸乙酯盐酸盐的过程。该过程包括以下步骤:将
L-精氨酸乙酯二盐酸盐在蒸馏
水中连续搅拌约10至20分钟以获得清澈的溶液;将清澈的溶液降温至约5°C至10°C以获得冷却的溶液;通过加入
氢氧化钠溶液将冷却的溶液的pH值调节在约7至8的范围内;在连续搅拌的情况下向清澈的溶液中加入至少一种有机溶剂以获得中间混合物;同时在温度约为7°C至9°C,pH值在约7.2至7.5的条件下,通过同时加入酸卤和20%
氢氧化钠溶液来缩合中间混合物,反应约2小时以获得混合物;将混合物的温度升高至约18至20°C,然后加入
氢氧化钠以将混合物的pH值调节至约7.3;在温度约为25°C至30°C的条件下加热混合物以获得含有有机相和
水相的结果混合物;通过沉淀混合物来分离结果混合物的有机相和
水相;并在约70°C至75°C的温度下在真空下蒸馏有机相以获得月桂酰乙基精
氨酸盐酸盐。