METHOD FOR PRODUCING 3,5-DIMETHYLDODECANOIC ACID; AND 4-CARBOXY-3,5-DIMETHYL-3,5-DODECADIENOIC ACID
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:EP2949642A1
公开(公告)日:2015-12-02
Provided are a short process for simply and efficiently producing 3,5-dimethyldodecanoic acid, which is an active ingredient of the pheromone of California prionus, and 4-carboxy-3,5-dimethyl-3,5-dodecadienoic acid which is an intermediate useful for producing 3,5-dimethyldodecanoic acid. More specifically, provided is a method for producing 3,5-dimethyldodecanoic acid, comprising the steps of subjecting 3-methyl-2-pentene-1,5-diacid diester (1) and 2-nonanone (2) to a condensation reaction and subsequent hydrolysis into 4-carboxy-3,5-dimethyl-3,5-dodecadienoic acid (3); decarboxylating or decarboxylating and hydrolyzing the 4-carboxy-3,5-dimethyl-3,5-dodecadienoic acid (3) into 3,5-dimethyl-2,4-dodecadienoic acid (4); and hydrogenating the 3,5-dimethyl-2,4-dodecadienoic acid (4) into 3,5-dimethyldodecanoic acid (5), as shown in the following scheme:
本发明提供了一种简便高效地生产3,5-二甲基十二烷酸(加州朊病毒信息素的活性成分)和4-羧基-3,5-二甲基-3,5-十二烯酸(生产3,5-二甲基十二烷酸的中间体)的简短工艺。更具体地说,提供了一种生产 3,5-二甲基十二烷酸的方法,包括以下步骤:将 3-甲基-2-戊烯-1,5-二酸二酯(1)和 2-壬酮(2)进行缩合反应,然后水解为 4-羧基-3,5-二甲基-3,5-十二烯酸(3);将 4-羧基-3,5-二甲基-3,5-十二碳二烯酸(3)脱羧或脱羧并水解为 3,5-二甲基-2,4-十二碳二烯酸(4);以及将 3,5-二甲基-2,4-十二碳二烯酸(4)氢化为 3,5-二甲基十二烷酸(5),如下图所示: