Thionyl Chloride → N-[4-(2-Pyrimidinylsulfonyl)phenyl]-3,3-difluoro-2-hydroxy-2-difluoromethyl propionamide

Participants

Reaction Conditions

Reaction Steps

To a solution of 2,2-bis-difluoromethyl-2-hydroxyacetic acid (0.5 g, 2.84 mmoles) in dimethyl acetamide (10 ml) at -10° C. was added thionyl chloride (0.34 g, 2.84 mmole)s) dropwise. The resulting solution was stirred at -10° C. for approximately 30 mins. 4-(2-pyrimidylsulfonyl)aniline (0.59 g, 2.5 mmoles) was added and the reaction mixture was stirred overnight at room temperature. The reaction mixture was poured into water, and sodium bicarbonate solution was added to give a pH of 7-7.5. A dark colored precipitate was formed that was filtered, washed with water and dried. The crude material was preabsorbed onto silica gel and chromatographed on silica gel eluting with 70-80% ethyl/acetate/hexane. Evaporation of product-containing fractions and crystallization from methylene chloride/methanol/hexane gave the title compound (0.33 g, 34%) as a white solid; mp 209°-210° C. 1H--NMR (300 MHz, d6 --DMSO):6.46(t, J=54.06 Hz, 2H, HCF 2), 7.78 (t, J=4.8 Hz, 1H, ArH), 7.95-7.98(m, 3H, ArH, OH), 8.02-8.06(m, 2H, ArH), 9.01 (d, J=5.01 Hz, 2H, ArH), 10.58 (s, 1H, NH). MS(CI):394(M+1, 100%).

Provenance & Evidence