A Practical Procedure for the Synthesis of Esonarimod, (R,S)-2-Acetylthiomethyl-4-(4-methylphenyl)-4-oxobutanoic Acid, an Antirheumatic Agent. (Part 1).
作者:Toshiya Noguchi、Akira Onodera、Kazuyuki Tomisawa、Sadakazu Yokomori
DOI:10.1248/cpb.50.1407
日期:——
An efficient and practical procedure for the synthesis of esonarimod, (R,S)-2-acetylthiomethyl-4-(4-methylphenyl)-4-oxobutanoic acid (1), a new antirheumatic drug, has been developed. The intermediate, 2-methylene-4-(4-methylphenyl)-4-oxobutanoic acid (2), was prepared by Friedel-Crafts acylation of toluene with itaconic anhydride (3) in the presence of aluminum trichloride and nitrobenzene in 63%
已开发出一种合成新的抗风湿药埃沙利莫德(R,S)-2-乙酰硫基甲基-4-(4-甲基苯基)-4-氧代丁酸(1)的有效而实用的方法。中间体2-亚甲基-4-(4-甲基苯基)-4-氧代丁酸(2)是在三氯化铝和硝基苯存在下,将甲苯与衣康酸酐(3)进行Friedel-Crafts酰化反应制得的,产率为63%无需硅胶柱纯化。通过将2与硫代乙酸(4)迈克尔加成制备化合物1,产率为74%。总体而言,从3中获得1的产率为47%。还阐明了2的副产物(五种化合物)的结构和合成机理。