Triisopropyl borate → (5-benzyl-1-methyl-1H-pyrazol-4-yl)boronic acid

Participants

Reaction Conditions

Reaction Steps

5-Benzyl-4-bromo-1-methyl-1H-pyrazole (0.27 g; 1.06 mmol) is dissolved in 5.0 ml anhydrous THF and cooled down to −78° C. Afterwards triisopropyl borate (0.46 ml; 2.01 mmol) and n-BuLi; 1.6 mol/l in Hexane; (0.69 ml; 1.11 mmol) are added. It is stirred for 1 hour within the desired product is formed. It is warmed to 25° C. and quenched with water. It is purified with reverse phase chromatography by using basic conditions.

Provenance & Evidence