Thionyl Chloride → 3-Chloroisonicotinoyl chloride

A mixture of 0.69 g of 3-chloroisonicotinic acid, 5 ml of thionyl chloride and 30 mg of DMF was heated to reflux for 3.5 hours. The reaction mixture was cooled to room temperature, and then the reaction mixture was concentrated under reduced pressure to give 3-chloroisonicotinic acid chloride. A mixture of the resultant 3-chloroisonicotinic acid chloride and 4 ml of DMF was added dropwise to a mixture of 0.85 g of 2-amino-5-fluoro-4-trifluoromethylphenol, 0.88 g of triethylamine and 4 ml of DMF while ice-cooling. Thereafter, the reaction mixture was stirred at room temperature for one hour and at 50° C. for one hour. The reaction mixture was cooled to room temperature, and then water was added, followed by extraction with ethyl acetate twice. The combined organic layers wee washed with water and a saturated sodium chloride solution, then dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The resultant solid was washed with diethyl ether to give 0.77 g of 3-chloro-N-[4-fluoro-2-hydroxy-5-(trifluoromethyl)phenyl]-isonicotinamide.

1. temperaturewas heated
2. temperatureto reflux for 3.5 hours
3. concentrationthe reaction mixture was concentrated under reduced pressure

ORD record

ord-ae14303315534b4ca868d4a433e12783

Source dataset

uspto-grants-2012_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08242133B2