Asymmetric chemoenzymatic synthesis of N-acetyl-α-amino esters based on lipase-catalyzed kinetic resolutions through interesterification reactions
作者:Marcos Reinaldo da Silva、Marcos Carlos de Mattos、Maria da Conceição Ferreira de Oliveira、Telma Leda Gomes de Lemos、Nágila Maria Pontes Silva Ricardo、Gonzalo de Gonzalo、Iván Lavandera、Vicente Gotor-Fernández、Vicente Gotor
DOI:10.1016/j.tet.2014.02.012
日期:2014.4
transfer catalysts, this compound reacted with several alkyl halides, being benzyltributylammonium chloride identified as the best one for the production of a series of quaternary amino acids in moderate to excellent yields (52–95%). Then, the corresponding N-acetyl-phenylalanine methyl and allyl ester derivatives were obtained through acidic hydrolysis, esterification, and N-acetylation. Rhizomucor miehei
从容易获得的乙酰氨基氰基乙酸乙酯开始,已经通过四步路线合成了几种苯丙氨酸类似物。在第一个反应中,并使用相转移催化剂,该化合物与几种烷基卤反应,即苄基三丁基氯化铵,被确定为以中等至极高产率(52–95%)生产一系列季氨基酸的最佳选择。然后,通过酸性水解,酯化和N-乙酰化获得相应的N-乙酰基-苯丙氨酸甲基和烯丙基酯衍生物。根瘤菌脂肪酶被认为是用于拆分这些氨基酯的通用酶,通过与丁酸丁酯在乙腈中进行酯交换反应获得最佳结果。发现取决于化合物的化学结构,对立体选择性有很大的影响,对于苯环中的未取代或对位取代,实现了极好的立体选择性,对间硝基衍生物适中,而邻硝基氨基酯则对中等选择性具有中等选择性。不反应。