The present invention relates to a process to prepare esters of an amino carboxylic acid of the formula (I) wherein R is an alkyl group containing 5 to 16 carbon atoms that may be branched or linear, k is a value of 1 to 3, m is an integer from 0 to 25, A is -CH2-CH2- or - CH2CH(CH3)- or -CH2-CH(CH2-CH3)-, n is an integer of at least 3 and at most 8, each R1 is a hydrogen atom, each R2 is independently a hydrogen atom or methyl or ethyl group, preferably each R2 is a hydrogen atom, and wherein X is an anion derivable from deprotonating a Brønsted-Lowry acid comprising the steps of reacting an aminocarboxylic acid present as a cyclic amide of the formula (II) and an alkanol of the formula R-(0-A)mOH in the presence of the Brønsted-Lowry acid at a temperature of between 60 and 200 degrees C wherein the total molar amount of aminocarboxylic acid to the molar amount of the alkanol is between 1 :0.8 and 1 :1.5 and wherein the Brønsted-Lowry acid is not added to the reaction mixture until least 50% of the total of the alkanol and cyclic amide are added to the reaction mixture.
本发明涉及一种制备
氨基
羧酸酯的方法,其
化学式为(I),其中R是含有5至16个碳原子的支链或直链烷基基团,k为1至3的值,m为0至25的整数,A为-
CH2- -或- CH(
CH3)-或- -CH( - )-,n为至少3且至多8的整数,每个R1为氢原子,每个R2独立地为氢原子或甲基或乙基基团,最好每个R2为氢原子,其中X是可由去质子化Brønsted-Lowry酸得到的阴离子,包括以下步骤:在60至200摄氏度的温度下,在Brønsted-Lowry酸的存在下,反应
化学式为(II)的环酰胺存在的
氨基
羧酸和
化学式为R-(0-A)mOH的烷醇,其中
氨基
羧酸的摩尔总量与烷醇的摩尔量之比在1:0.8至1:1.5之间,且直到将总量的至少50%的烷醇和环酰胺加入到反应混合物中之前,才向反应混合物中添加Brønsted-Lowry酸。