Trifluoromethanesulfonic anhydride → HCID 57454150, compound

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Reaction Steps

Trifluoromethanesulfonic anhydride (0.8 mL, 4.76 mmol) was added to a solution of 4-(1-ethyl-1-hydroxy-propyl)-2-methoxy-phenol (Example 176-(3); 1.0 g, 4.76 mmol) in pyridine (4 mL) at room temperature, and the mixture was stirred at room temperature for one hour. The reaction solution was extracted with ethyl acetate. The organic layer was washed with 1 N hydrochloric acid aqueous solution and brine, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by silica gel chromatography (hexane only to hexane:ethyl acetate=1:1) to give trifluoromethanesulfonic acid 4-(1-ethyl-1-hydroxy-propyl)-2-methoxy-phenyl ester (1.51 g, 93%). Trifluoroacetic acid (0.1 mL) was added to a mixture of trifluoromethanesulfonic acid 4-(1-ethyl-1-hydroxy-propyl)-2-methoxy-phenyl ester (100 mg, 0.292 mmol) with o-cresol (68.2 mg, 585 mmol) at room temperature, and the mixture was stirred at room temperature for 16 hours. The mixture was concentrated under reduced pressure. Then, the resulting residue was purified by silica gel chromatography (hexane only to hexane:ethyl acetate=4:1) to give the title compound (0.12 g, 95%).

Provenance & Evidence