申请人:Rallis India Limited
公开号:US20150112063A1
公开(公告)日:2015-04-23
The present disclosure provides process for preparation of azimsulfuron or its salts, isomers, and other derivatives thereof. The process involves treating a compound of formula I,
with aqueous acetic acid or formic acid and chlorine gas or sodium hypochlorite in presence of hydrochloric acid in chlorinated solvents such as dichloromethane, 1,2-dichloroethane or with aqueous acetic acid and N-chlorosuccinimide or hydrogen peroxide in presence of hydrochloric acid in aqueous cyclic ether such as tetrahydrofuran, 1,4-dioxane to obtain 1-methyl-4-(2-methyl-2H-tetrazol-5-yl)-1H-pyrazole-5-sulfonyl chloride; converting the sulfonyl chloride to a sulfonamide and treating the sulfonamide with a phenyl(4,6-dimethoxypyrimidin-2-yl) carbamate to obtain azimsulfuron or its salts, isomers, and other derivatives thereof.
本公开提供了制备阿吉磺隆或其盐、异构体和其他衍生物的方法。该方法涉及使用具有式I的化合物,
在氯代溶剂(如二氯甲烷、1,2-二氯乙烷)中,通过在水杨酸或甲酸和氯气或次氯酸钠的存在下,用盐酸处理;或者在水环醚(如四氢呋喃、1,4-二噁烷)中,通过在水杨酸和N-氯琥珀酰亚胺或过氧化氢的存在下,用盐酸处理,以获得1-甲基-4-(2-甲基-2H-四唑-5-基)-1H-吡唑-5-磺酰氯;将磺酰氯转化为磺酰胺,并将磺酰胺与苯基(4,6-二甲氧基嘧啶-2-基)氨基甲酸酯处理,以获得阿吉磺隆或其盐、异构体和其他衍生物。