Phosphorus oxychloride → 4-Chloro-2-(2-ethylsulfanylphenyl)-6-trifluoromethylpyrido[2,3-d]pyrimidine

Participants

Reaction Conditions

Reaction Steps

A mixture of 970 mg of 2-(2-ethylsulfanylphenyl)-6-trifluoromethyl-3H-pyrido[2,3-d]pyrimidin-4-one, 0.39 ml of phosphorus oxychloride, 428 mg of N,N-diisopropylethylamine and 20 ml of toluene was stirred at 100° C. for 5 hours. A saturated aqueous sodium bicarbonate solution was added to the cooled reaction mixture, and the mixture was extracted with t-butyl methyl ether. The organic layer was washed with water and dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure to obtain 996 mg of 4-chloro-2-(2-ethylsulfanylphenyl)-6-trifluoromethylpyrido[2,3-d]pyrimidine (Compound of Present Invention 22).

Provenance & Evidence