Jivan Dhanraj Pawar,Sanjay Sambhajirao Palimkar,B. Sankar,Subhash Rajaram Kadam,Rama Mohan Hindupur,Venkatesh M. Prabhu,Hari Narayan Pati,Vadiraj Gopinath Suphala,Avinash Sheshrao Mane
申请号：
US14005809
公开号：
US20150112063A1
申请日:
2013.04.12
申请国别(地区):
US
年份:
2015
代理人:
摘要：
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.
