第 38 卷第 3 期Vol. 38 No. 3
2008 年 6 月Jun 2008

所属栏目:医药及中间体

4-氨基-5-乙磺酰基-2-甲氧基苯甲酸的合成
刘 磊,杨艺虹,张 珩,王 玉,詹 慧 (武汉工程大学 湖北省新型反应器与绿色化学工艺重点实验室,湖北 武汉 430073)
摘 要:以对氨基水杨酸为起始原料,用硫酸二甲酯甲基化制得4-氨基-2-甲氧基苯甲酸甲酯;然后与溴素和硫氰酸钾反应制得4-氨基-2-甲氧基-5-氰硫基苯甲酸甲酯;再用溴乙烷在氢氧化钾催化下乙基化制得4-氨基-5-乙硫基-2-甲氧基苯甲酸;最后用双氧水氧化制得氨磺必利的中间体4-氨基-5-乙磺酰基-2-甲氧基苯甲酸,合成总收率为24.5%,目标物化学结构经IR、1H NMR、MS确证。
关键词:4-氨基-5-乙磺酰基-2-甲氧基苯甲酸;中间体;氨磺必利;合成
中图分类号:0626.414  文献标识码:A  文章编号:1009-9212(2008)03- 0029-04
Synthesis of 4-Amino-5-ethylsulfonyl-2-methoxybenzoic Acid
LIU Lei,YANG Yi-hong,ZHANG Heng,WANG Yu ,ZHAN Hui (Hubei Key Laboratory of Novel Chemical Reactor&Green Chemical Technology,Wuhan Institute of Technology,Wuhan 430073, China)
Abstract:The 4-amino-5-ethylsulfonyl-2-methoxybenzoic acid,an intermediate of amisulpride was synthesized from 4-amino-2-hydroxybenzoic acid as material. Firstly,the methyl 4-amino-2-methoxybenzoate was obtained by the methylation of dimethyl sulfate. Then,the methyl 4-amino-2-methoxy-5- thiocyanatobenzoate was prepared by the reaction of potassium thiocyanate with bromine. Furthermore,the methyl 4-amino-5-ethylthio-2-methoxy benzoicacid was formed from the ethylation of bromoethane at catalysis of potassium hydroxide. Finally,the 4-amino-5-ethylsulfonyl-2-methoxybenzoic acid was obtained via oxidation with hydrogen peroxide. The total yield was 24.5%. The chemical structure was confirmed by IR,1H NMR,MS.
Key words:4-amino-5-ethylsulfonyl-2-methoxybenzoic acid;intermediate;amisulpride;synthesis
作者简介:刘 磊(1984-),男,湖北武汉人,硕士研究生,从事药物合成方面研究。(E-mail:applle@126.com)
联 系 人:杨艺虹(1954-),女,教授,从事制药工程专业教学及药物研究工作。(E-mail:hong289@sina.com)
收稿日期:2008-05-20