반응 #430612

반응 방정식

3,5-dibromopyridine

benzyl alcohol

sodium

benzyl alcohol

→

3-bromo-5-benzyloxypyridine

수율 56.9%

용매

water

반응 조건

후처리

1. 1
   온도The mixture was further heated at 100° C. for 48 h
2. 2
   온도to cool to ambient temperature
3. 3
   추출extracted with diethyl ether (5×50 mL)
4. 4
   건조The combined ether extracts were dried (Na2SO4)
5. 5
   여과filtered
6. 6
   농축concentrated by rotary evaporation
7. 7
   workup.DISTILLATIONVacuum distillation
8. 8
   기타removed excess benzyl alcohol, bp 68°-72° C. at 2.6 mm Hg
9. 9
   workup.DISTILLATIONFurther vacuum distillation

실험 절차

Under a nitrogen atmosphere, small pieces of sodium (1.48 g, 64.4 mmol) were added to benzyl alcohol (17.11 g, 158.0 mmol), and the mixture was stirred and heated at 70° C. for 18 h. To the stirring, viscous mixture was added 3,5-dibromopyridine (5.00 g, 21.1 mmol), copper powder (255 mg, 4.0 mmol), and benzyl alcohol (15 mL). The mixture was further heated at 100° C. for 48 h. The reaction mixture was allowed to cool to ambient temperature, diluted with water (50 mL), and extracted with diethyl ether (5×50 mL). The combined ether extracts were dried (Na2SO4), filtered, and concentrated by rotary evaporation. Vacuum distillation removed excess benzyl alcohol, bp 68°-72° C. at 2.6 mm Hg. Further vacuum distillation afforded 3.17 g (38.0%) of 3-bromo-5-benzyloxypyridine as a white, crystalline solid, mp 64°-66° C.

출처