反应详情

2-bromopyridine (7.0 g, 44.0 mmol), palladium acetate (0.5 g, 2.2 mmol), triphenylphosphine (2.5 g, 9.5 mmol), potassium carbonate (37.0 g, 267.0 mmol), 1,2-dimethoxyethane (60 g) and water (80 g) were added to the resultant 6-chloro-3-pyridyl boronic acid (6.9 g, 44.0 mmol), and the reaction mixture was stirred, and then refluxed with heating for 6.0 hours. Reaction solution was cooled, and then ethyl acetate (50 g) was added, the reaction solution was stirred for 1.0 hour, and was left to stand to separate organic layer. Organic layer was washed with 10% by weight of aqueous solution of ammonium chloride (20 g), 10% aqueous solution of ammonia (20 g), 10% aqueous solution of sodium chloride (20 g), and then condensed under reduced pressure to obtain 6-chloro-3,2′-bipyridine (7.0 g, 38.3 mmol).

1. temperaturerefluxed
2. temperaturewith heating for 6.0 hours
3. customReaction solution
4. temperaturewas cooled
5. stirringthe reaction solution was stirred for 1.0 hour
6. waitwas left
7. customto separate organic layer
8. washOrganic layer was washed with 10% by weight of aqueous solution of ammonium chloride (20 g), 10% aqueous solution of ammonia (20 g), 10% aqueous solution of sodium chloride (20 g)
9. customcondensed under reduced pressure