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0 °C

Eighty milligrams (80 mg) of acetyl chloride (1.00 mmol) were added to a mixture of 420 mg (1.00 mmol), of 3-difluoromethoxy-N-[2-(4-hydroxy-3-methoxyphenyl)ethyl]-2-(5,6,7,8-tetrahydronaphthalen-2-yl) acrylamide, 120 mg (1.20 mmol) of triethylamine and 5 ml of tetrahydrofuran at 0° C. and stirred at 0° C. for 30 minutes and then at room temperature for 2 hours. Water and ethyl acetate were added to the reaction mixture. The organic layer was washed with 5% hydrochrolic acid and saturated brine subsequently, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel chromatography (eluent, hexane:ethyl acetate=3:1) to give 260 mg of 3-difluoromethoxy-N-[2-(3-methoxy-4-acetyloxyphenyl)ethyl]-2-(5,6,7,8-tetrahydronaphthalen-2-yl)acrylamide (the present compound 1282).

1. waitat room temperature for 2 hours
2. washThe organic layer was washed with 5% hydrochrolic acid and saturated brine subsequently
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under reduced pressure