2-Chlorobenzoyl isocyanate → 6-{2,6-Dichloro-4-[(2-chlorobenzoyl)ureido]phenoxy}hexanoic acid

Participants

Reaction Steps

A solution of 7.5 g (41.1 mmol) of 2-chlorobenzoyl isocyanate in 300 ml of acetonitrile was added to a suspension of 10.0 g (34.2 mmol) of 6-(4-amino-2,6-dichlorophenoxy)hexanoic acid in 700 ml of dry acetonitrile under a protective gas atmosphere at room temperature. The mixture was boiled under reflux for 2 hours and cooled to room temperature. The resulting precipitate was filtered off with suction and washed with 50 ml of acetonitrile. The residue was stirred with 100 ml of methanol, filtered off with suction, washed with a little methanol and dried at 40° C. under vacuum overnight. 13.7 g (28.9 mmol, 85%) of the required product were obtained. Melting point: about 171-173° C.

Provenance & Evidence