反应详情

A solution of 2-ethoxy-4-cyanobenzoyl chloride (10.9 g, 52 mmol), prepared as in Preparation 11, in dichloromethane (109 ml) was added dropwise in 5 h to a solution of 4,5-dichlorophenylendiamine (18.5 g, 104.5 mmol) and triethylamine (53 g=72.6 ml, 523 mmol) in dichloromethane (550 ml). Stirring was continued for additional 2 h. The solvent was removed under vacuum and the residue was triturated with water (100 ml), filtered and dried at 50° C. under vacuum. The solid was suspended in diethyl ether (200 ml), stirred for 1 h, filtered and dried under vacuum to give 19 g of N-(2-amino-4,5-dichlorophenyl)-2-ethoxy-4-cyanobenzamide (yield 51%), mp=195–198° C.

1. customThe solvent was removed under vacuum
2. customthe residue was triturated with water (100 ml)
3. filtrationfiltered
4. customdried at 50° C. under vacuum
5. stirringstirred for 1 h
6. filtrationfiltered
7. customdried under vacuum