Methanesulfonyl chloride → HCID 10674539, compound

Participants

Reaction Conditions

Reaction Steps

1-[(1R,2S)-2-(2,4-Difluorophenyl)-2,3-dihydroxy-1-methylpropyl]-3-[4-(2,2,3,3-tetrafluoropropoxy)phenyl]-2(1H,3H)-imidazolone (1.2 g) was dissolved in 25 ml of ethyl acetate, to which 0.29 ml of methanesulfonyl chloride and 0.53 ml of triethylamine were added dropwise with ice cooling. After stirring at 0° C. for 30 minutes, the reaction solution was washed with water (15 ml×2) and 15 ml of an aqueous solution of sodium chloride successively. The organic layer was dried over magnesium sulfate. After the solvent was distilled off under reduced pressure, the residue was purified by silica gel chromatography (silica gel: 50 g, eluent; hexane:ethyl acetate=1:1). The desired fraction was concentrated and the residue was recrystallized from a mixture of 5 ml of diisopropyl ether and 10 ml of hexane to give 1.26 g of 1-[(1R,2S)-2-(2,4-difluorophenyl)-2-hydroxy-3-methanesulfonyloxy-1-methylpropyl]-3-[4-(2,2,3,3-tetrafluoropropoxy)phenyl]-2(1H,3H)-imidazolone as colorless powdery crystals.

Provenance & Evidence