Single step regioselective cyclization and chlorination of hydroxyamino-N-(2-methylphenyl)acetamide to 5-chloro-7-methylindoline-2,3-dione
申请人:Tagros Chemicals India Pvt. Ltd.
公开号:US10981868B1
公开(公告)日:2021-04-20
A one-pot process for the manufacture of 5-chloro-7-methylindoline-2,3-dione starting from 2-hydroxyimino-N-(2-methylphenyl)acetamide via tandem cyclization in sulfuric acid and acetic acid, followed by in-situ chlorination with sulfur dioxide and chlorine gas in high regioselectivity and yield.
一种单锅法制备5-氯-7-甲基吲哚-2,3-二酮的工艺,从2-羟基亚胺-N-(2-甲基苯基)乙酰胺开始,通过在硫酸和乙酸的串联环化反应中,然后在高区域选择性和产率下通过硫 dioxide 和氯气的原位氯化反应制备。