反应详情

温度

-78 °C

In an argon atmosphere, 10 g (29 mmol) of 5-bromo-1,2-diphenyl-1H-benzimidazole were dissolved into 100 mL of dehydrated THF, and the temperature of the solution was cooled to −78° C. Then, 20 mL of n-butyllithium (in hexane, 1.6 mol/L) were dropped. After the mixture had been stirred at −78° C. for 1 hour, the temperature of the mixture was increased to 0° C. The temperature of the mixture was cooled to −78° C. again, and 9.7 mL (87 mmol) of trimethoxyborane were dropped. The mixture was stirred at −78° C. for 1 hour, and was then stirred at room temperature for 2 hours. 100 mL of 10-mass % hydrochloric acid were added, and the whole was stirred for 1 hour, followed by filtration. The organic layer of the filtrate was washed with a saturated sodium chloride solution and dried with magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by means of silica gel column chromatography to obtain 3.2 g of 1,2-diphenyl-1H-benzimidazole-5-boronic acid (35% yield).

1. temperaturethe temperature of the mixture was increased to 0° C
2. temperatureThe temperature of the mixture was cooled to −78° C. again
3. stirringThe mixture was stirred at −78° C. for 1 hour
4. stirringwas then stirred at room temperature for 2 hours
5. stirringthe whole was stirred for 1 hour
6. filtrationfollowed by filtration
7. washThe organic layer of the filtrate was washed with a saturated sodium chloride solution
8. dry with materialdried with magnesium sulfate
9. distillationThe solvent was distilled off under reduced pressure
10. customthe residue was purified by means of silica gel column chromatography