NOVEL PREPARATION METHOD FOR ANTI-GOUT DRUG LESINURAD, AND KEY INTERMEDIATE THEREOF
申请人:Zhejiang Huahai Pharmaceutical Co., Ltd.
公开号:US20200062720A1
公开(公告)日:2020-02-27
A novel preparation method for the anti-gout drug Lesinurad, and a key intermediate thereof. The method comprises the following reaction steps: 1) the compound of formula II undergoing a substitution reaction with R
3
—SH in the presence of a first solvent and a first alkali to generate a mixture containing the compound of formula III and the compound of formula IV; 2) adding a second alkali and R
3
X to the resulting mixture for a reaction to obtain the compound of formula III, wherein: R represents a cyclopropane group, a halogen, a triflate group, a mesylate group or a tosylate group, preferably a cyclopropane group; R
3
represents —COCH
3
, a benzyl group or —CH
2
R
4
, wherein R
4
represents a methyl acetate group, an ethyl acetate group, —C(O)OC
2
H
5
, —C(O)OCH
3
, —CN, —CH
2
OH or a phenyl group substituted with one or more of a C1-C6 alkyl group and a halogen; X represents a halogen. The process of the present invention directly converts the compound of formula IV into the product compound of formula III without separation, significantly increasing the reaction yield and simplifying the operation steps. In addition, the synthesis of the new intermediate of the present invention does not require the use of highly toxic thiophosgene and carbon disulphide, significantly improving the safety and environmental friendliness of the process.
一种用于抗痛风药物Lesinurad的新型制备方法及其关键中间体。该方法包括以下反应步骤:1) 在第一溶剂和第一碱的存在下,式II化合物与R3—SH发生取代反应,生成含有式III化合物和式IV化合物的混合物;2) 向所得混合物中加入第二碱和R3X进行反应,得到式III化合物,其中:R代表环丙烷基、卤素、三氟甲磺基、甲磺酸基或对甲苯磺酸基,优选环丙烷基;R3代表—COCH3、苄基或—CH2R4,其中R4代表甲酸甲酯基、乙酸乙酯基、—C(O)OC2H5、—C(O)OCH3、—CN、—CH2OH或苯基,其上取代有一个或多个C1-C6烷基和卤素;X代表卤素。本发明的工艺直接将式IV化合物转化为式III产物,无需分离,显著提高了反应产率并简化了操作步骤。此外,本发明的新中间体合成不需要使用高毒性的硫代氯酰和二硫化碳,显著提高了工艺的安全性和环保性。