m-Chloroperbenzoic acid → 2-Methanesulfinylpyrimidine-5-carboxylic acid (4-fluorophenyl)amide

Participants

Reaction Steps

To a solution of 2-methylsulfanylpyrimidine-5-carboxylic acid (4-fluorophenyl)amide (2.00 g, 7.60 mmol) in dichloromethane (76 mL) was added m-CPBA (67%, 2.02 g, 7.84 mmol) in one portion. Solid precipitate appeared within 2 min, and after 10 min the solution was diluted with 2/1 dichloromethane/hexane (60 mL). The solids were collected by filtration and washed with 50% dichloromethane/hexane to afford, after drying, 1.558 g (73% yield) of the titled sulfoxide. A second crop was obtained by concentrating the filtrate and triturating the solids first with hot 2/1 dichloromethane/hexane, and then after filtration by a second trituration with acetone. An additional 0.22 g (10%) of titled product was obtained, and was shown by 1H NMR to be contaminated with 10% sulfone.

Provenance & Evidence