反应详情

NaH (761 mg, 19.83 mmol) was added portion wise to 2-bromo-4-hydroxypyridine (3 g, 17.24 mmol) in DMF (50 mL) at 0° C. under Ar(g). Then the reaction mixture was stirred at rt for 10 min after which it was again cooled down at 0° C. and benzyl bromide (2.15 mL, 18.10 mmol) was added. The reaction was stirred at it for 4 h, after which it was poured onto brine (200 mL) and EtOAc (200 mL) was added. The phases were separated and the organic phase was dried over MgSO4, filtered and subsequently evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography eluting with hexane/EtOAc (90:10 to 80:20) to furnish I as a white solid (2.331 g, 51%).

1. temperaturewas again cooled down at 0° C.
2. stirringThe reaction was stirred at it for 4 h
3. additionwas added
4. customThe phases were separated
5. dry with materialthe organic phase was dried over MgSO4
6. filtrationfiltered
7. customsubsequently evaporated under reduced pressure
8. customThe resulting residue was purified by silica gel column chromatography
9. washeluting with hexane/EtOAc (90:10 to 80:20)