反应详情

温度

-20 °C

Under argon, 200 mg (0.39 mmol) of [(4S)-7-cyclopentyl-5-(4-fluorophenyl)-4-hydroxy-2,2-dimethyl-3,4-dihydro-2H-chromen-6-yl][4-(trifluoromethyl)phenyl]methanone (Example 12A) and 180 μl (1.56 mmol) of 2,6-dimethylpyridine are dissolved in 1.25 ml of toluene and cooled to −20° C. A solution of 0.18 ml (0.78 mmol) of tert-butyldimethylsilyl trifluoromethanesulfonate in 1.25 ml of toluene is added dropwise, and the mixture is stirred at −20° C. for 15 min, then warmed to 0° C. and stirred for 1 hour. Another 18 μl (0.078 mmol) of tert-butyldimethylsilyl trifluoromethanesulfonate are added, and stirring is continued for another 1.5 h. 5 ml of 0.1 N hydrochloric acid are added, and the mixture is extracted repeatedly with ethyl acetate. The organic phases are washed with a 1:1 mixture of saturated sodium bicarbonate solution and saturated sodium chloride solution and with saturated sodium chloride solution, dried over sodium sulfate, filtered and concentrated. The residue is purified by column chromatography on silica gel (mobile phase: cyclohexane/ethyl acetate 15:1). This gives 227 mg (93% of theory) of the title compound.

1. temperaturewarmed to 0° C.
2. stirringstirred for 1 hour
3. stirringstirring
4. waitis continued for another 1.5 h
5. extractionthe mixture is extracted repeatedly with ethyl acetate
6. washThe organic phases are washed with a 1:1 mixture of saturated sodium bicarbonate solution and saturated sodium chloride solution and with saturated sodium chloride solution
7. dry with materialdried over sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated
10. customThe residue is purified by column chromatography on silica gel (mobile phase: cyclohexane/ethyl acetate 15:1)