Synthesis of fatty alcohol esters of alpha-hydroxy carboxylic acids and their use as percutaneous absorption enhancers
申请人:Jones S. Gerald
公开号:US20060084154A1
公开(公告)日:2006-04-20
The present invention provides a novel approach for the preparation of fatty alcohol esters of α-hydroxy carboxylic acids. In one form of the invention, the target fatty alcohol ester of α-hydroxy carboxylic acid is produced by converting a lower alkyl ester of α-hydroxy carboxylic acid into a fatty alcohol ester of α-hydroxy carboxylic acid via alcoholysis (i.e., transesterification). The transesterification process is an equilibrium reaction, catalyzed chemically (i.e., with acids or bases) or enzymatically, that is shifted in the desired direction to produce the desired product. One preferred way of shifting the reaction in the direction of the desired product is by reducing the concentration of one of the products (e.g., distillation of a lower-boiling alcohol as soon as it is formed). Another preferred way of shifting the reaction in-the direction of the desired product is by increasing the concentration of one of the reactants (e.q., adding more of the starting ester).
本发明提供了一种新颖的方法,用于制备α-羟基羧酸的脂肪醇酯。在本发明的一种形式中,通过将α-羟基羧酸的较低烷基酯转化为脂肪醇酯,从而通过醇解(即酯交换)生产目标脂肪醇酯的α-羟基羧酸。酯交换过程是一个平衡反应,可以通过化学催化(即酸或碱)或酶催化来推动朝着所需产物的方向进行。将反应朝着所需产物的方向推动的一种首选方法是通过降低其中一个产物的浓度(例如,一旦形成较低沸点的醇,就进行蒸馏)。将反应朝着所需产物的方向推动的另一种首选方法是通过增加其中一个反应物的浓度(例如,添加更多的起始酯)。