反应详情

温度

-78 °C

n-Butyl lithium (1.6 M solution in hexanes, 37.5 ml, 0.060 mol) is added dropwise to a solution of 4-bromo-4′-chloro-3-methylbiphenyl (11.5 g, 0.041 mol) in tetrahydrofuran (120 ml) at −78° C., under an atmosphere of nitrogen, and the mixture is stirred at −78° C. for 30 minutes. Trimethyl borate (27.4 ml, 0.245 mol) is added slowly at −78° C. and the mixture is stirred for 1 hr. The reaction mixture is allowed to warm to room temperature over 2-3 hours and then stirred at room temperature for 1 hr. 0.1N Aqueous hydrochloric acid (320 ml) is added and the mixture is stirred at room temperature overnight. The reaction mixture is extracted with ethyl acetate (3×300 ml) and the organic extracts are combined, dried with anhydrous sodium sulfate, filtered and the filtrate is concentrated under reduced pressure. The residue is purified by column chromatography on silica gel to give 4′-chloro-3-methylbiphen-4-ylboronic acid (6.0 g) as white solid.

1. stirringthe mixture is stirred for 1 hr
2. temperatureto warm to room temperature over 2-3 hours
3. stirringstirred at room temperature for 1 hr
4. stirringthe mixture is stirred at room temperature overnight
5. extractionThe reaction mixture is extracted with ethyl acetate (3×300 ml)
6. dry with materialdried with anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationthe filtrate is concentrated under reduced pressure
9. customThe residue is purified by column chromatography on silica gel