反应详情

A solution of (8-bromo-6-fluoro-2H-chromen-2-yl)methyl 4-methylbenzenesulfonate (300 mg, 0.73 mmol) in absolute ethanol was added to 5% sulfided platinum on carbon (50 mg) and the mixture hydrogenated at 55 psi of hydrogen for 1 hour. The mixture was then filtered through celite and the filtrate concentrated under reduced pressure to afford a white semi-solid. Purification by flash chromatography using a solvent gradient of 5 to 25% ethyl acetate in hexane gave 148 mg (49%) of (8-bromo-6-fluoro-3,4-dihydro-2H-chromen-2-yl)methyl 4-methylbenzenesulfonate as a white solid.

1. filtrationThe mixture was then filtered through celite
2. concentrationthe filtrate concentrated under reduced pressure
3. customto afford a white semi-solid
4. customPurification by flash chromatography