Sodium hydride → Cevipabulin

Participants

Reaction Steps

To sodium hydride (60% in mineral oil, 2.3 g, 57.6 mmol) in 20 mL of dimethylsulfoxide at room temperature is added a solution of 3-(methylamino)propan-1-ol (5.14 g, 57.6 mmol) in 10 mL of dimethylsulfoxide. The solution is stirred at room temperature for 1 h, and 5-chloro-6-(2,4,6-trifluorophenyl)-N-[(1S)-2,2,2-trifluoro-1-methylethyl][1,2,4]triazolo[1,5-a]pyrimidin-7-amine (5.7 g, 14.4 mmol) is added. The mixture is heated at 60° C. for 3 h, and cooled to room temperature. The reaction mixture is diluted with ethyl acetate, and washed with water and saturated sodium chloride. The organic layer is dried over magnesium sulfate, and concentrated to a residue. The residue is triturated with small amount of acetone, then hexanes, and chromatographed over silica gel, eluting with a gradient of 100% ethyl acetate to 100% methyl alcohol. Concentration provides 5-chloro-6{2,6-difluoro-4-[3-(methylamino)propoxy]phenyl}-N-[(1S)-2,2,2-trifluoro-1-methylethyl][1,2,4]triazolo[1,5-a]pyrimidin-7-amine as a white solid (2.7 g). MS: m/z 465.1 (M+H).

Provenance & Evidence