Hydrochloric Acid → 2-Fluoro-6-(4-octyloxyphenyl)pyridine-3-boronic acid

Participants

Reaction Conditions

Reaction Steps

8.00 ml (56.80 mmol) of diisopropylamine in 10 ml of tetrahydrofuran are stirred at 0° C. with 35.70 ml (56.80 mmol) of a 1.6-molar n-butyllithium solution in hexane for 1 hour. After cooling to -78° C., 8.56 g (28.40 mmol) of 2-fluoro-6-(4-octyloxyphenyl)pyridine (prepared as described in Example 2) in 1000 ml of tetrahydrofuran are added dropwise, and the mixture is stirred at -78° C. for 4 hours. 21.25 g (113.00 mmol) of triisopropyl borate are then added dropwise at -78° C., and the reaction mixture is stirred overnight, during which it warms to room temperature. After addition of 100 ml of 10% hydrochloric acid and stirring at room temperature for one hour, sodium chloride solution is added, the mixture is extracted with ether, the ether phase is washed with sodium chloride solution, dried over sodium sulfate, filtered and concentrated. Recrystallization from acetonitrile gives 7.70 g of 2-fluoro-6-(4-octyloxyphenyl)pyridine-3-boronic acid. ##STR29##

Provenance & Evidence