p-Toluenesulfonic acid → N-[[2-(tert-butyldiphenylsilyloxy)ethoxy]methyl]-5-[(2,5-difluorophenyl)[(4-fluorophenyl)sulfonyl]methyl]-4-methylpyridine-2-carboxamide

Participants

Reaction Conditions

Reaction Steps

5-[(2,5-Difluorophenyl)[(4-fluorophenyl)sulfonyl]meth yl]-N-(1-hydroxymethyl)-4-methylpyridine-2-carboxamide (113 mg, 0.251 mmol) obtained in Example 85, and a solution of 2-(tert-butyldiphenylsilyloxy)ethanol (136 mg, 0.453 mmol) and p-toluenesulfonic acid (10 mg) in benzene (5 ml) were stirred for 3 hours with heating to 60° C. The reaction solution was returned to room temperature, and then was concentrated under reduced pressure. Ethyl acetate was added to the resulting concentration residue, and the mixture was washed sequentially with saturated aqueous sodium hydrogencarbonate and saturated brine. The organic layer was dried over anhydrous sodium sulfate and filtered, and then the filtrate was concentrated under reduced pressure. The resulting concentration residue was subjected to flash silica gel column chromatography, and the fraction obtained from an elution with 25% ethyl acetate/hexane was concentrated under reduced pressure, to obtain the title compound (93 mg, 0.127 mmol, 51%) as an amorphous substance.

Provenance & Evidence