Hydrochloric Acid → (2R,3R)-2-(2,4-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)-2,3-butanediol

Participants

Reaction Conditions

Reaction Steps

The (2R, 3R)-3-(tert-butyldimethylsilyloxy)-2-(2,4-difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)-2-butanol (12.2 g) synthesized in Example 12 was dissolved in methanol (41 mL). Hydrochloric acid (3 N, 21 g) was added to the solution and the mixture was stirred at 50° C. for four hours. Toluene (120 g) was added to the reaction mixture and was then stirred. Subsequently, an aqueous layer was separated. An aqueous solution (2 N, 41 g) of sodium hydroxide was added to the aqueous layer so that the pH of the mixture was controlled to be 9. The target compound was extracted with ethyl acetate (120 mL). The extracted organic layer was dried with anhydrous magnesium sulfate. The drying agent was filtered, and the filtrate was concentrated under reduced pressure. The resultant light yellow syrup was crystallized with toluene to recover-white crystals of the target compound (7.9 g, 92%). The values of the physical properties corresponded with those in Example 15. Diastereomeric excess: 99.5% de

Provenance & Evidence