反应详情

A solution of 2,4-dichloro-5-methylsulfonylbenzoic acid (Example 1, Step B) (60 g.; 0.267 mole) in aqueous ammonia (28%, 900 ml.) is heated in an autoclave at 180° C. for 12 hours. The cooled reaction mixture is poured into ice (3 kg.) and concentrated hydrochloric acid (1.3 liters) which causes the product to precipitate 42 g. (64% yield) of 4-chloro-5-methylsulfonylanthranilic acid, m.p. 286.5°-288.5° C. after recrystallization from acetic acid.

1. customThe cooled reaction mixture
2. customto precipitate 42 g