p-Toluenesulfonic acid monohydrate → HCID 178462432, compound

Participants

Reaction Steps

A mixture of 4.63 g (23.0 mmol) of 3-fluoro-4-[(1E,3E)-5-oxo-1,3-pentadienyl]benzonitrile [produced as described in Step 1(ii) above], 8.73 g (24.3 mmol of (2R,3R)-2-(2,4-difluorophenyl)-3-[[1-(hydroxymethyl)-2-hydroxyethyl]thio]-1-(1H-1,2,4-triazol-1-yl)-2-butanol [produced as described in Japanese Patent Application (Kokai) Hei 8-333350)], 5.07 g (26.7 mmol) of p-toluenesulfonic acid monohydrate and 200 ml of anhydrous tetrahydrofuran was allowed to stand at ambient temperature for 30 minutes. At the end of this time, the reaction mixture was concentrated using a rotary evaporator and dried in vacuo. The resulting residue was dissolved in 150 ml of anhydrous tetrahydrofuran and the resulting mixture was then evaporated to dryness in vacuo using a rotary evaporator. This procedure was repeated twice more. A solution of the resulting residue in 150 ml of anhydrous tetrahydrofuran was poured into a saturated aqueous sodium hydrogen carbonate solution with stirring. The product was then extracted with ethyl acetate and the organic layer was washed with aqueous sodium chloride solution, dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The residual oil was purified by chromatography on a silica gel (500 g) column using a 2:1 mixture of ethyl acetate and hexane as the eluant to give 9.35 g (yield 74%) of the title compound as a yellow amorphous solid.

Provenance & Evidence