反应详情

Under a nitrogen atmosphere, a solution of 3-hydroxypyridine (12.00 g, 126.18 mmol) in N,N-dimethylformamide (DMF) (63 mL) was added drop-wise over 25 min to a cold (0-5° C.), stirring slurry of sodium hydride (6.17 g of an 80% dispersion in mineral oil, 205.7 mmol) in DMF (130 mL). The mixture was allowed to stir and warm to ambient temperature over 1 h. Next, 1-bromo-2-chloroethane (21.71 g, 151.37 mmol) was added drop-wise over 45 min. The resulting dark-brown mixture was stirred at ambient temperature for 24 h. Gas chromatographic analysis indicated an incomplete reaction; therefore, more 1-bromo-2-chloroethane (8.65 g, 60.3 mmol) and sodium hydride (2.09 g of an 80% dispersion in mineral oil, 69.7 mmol) were added. The mixture was stirred at ambient temperature for 40 h. Water (60 mL) was carefully added over 30 min, followed by saturated NaCl solution (40 mL), and the mixture was extracted with ether (6×50 mL). The combined orange-yellow ether extracts were washed with saturated NaCl solution (75 mL). The ether layer was dried (Na2SO4), filtered, and concentrated by rotary evaporation to a residue that was dried briefly under high vacuum to give 2.87 g (14.4%) of a light-brown oil.

1. stirringThe resulting dark-brown mixture was stirred at ambient temperature for 24 h
2. customan incomplete reaction
3. stirringThe mixture was stirred at ambient temperature for 40 h
4. extractionthe mixture was extracted with ether (6×50 mL)
5. washThe combined orange-yellow ether extracts were washed with saturated NaCl solution (75 mL)
6. dry with materialThe ether layer was dried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated by rotary evaporation to a residue that
9. customwas dried briefly under high vacuum