Hydrochloric Acid → 4-ethoxy-2-trifluoromethylphenylboric Acid

Participants

Reaction Conditions

Reaction Steps

Compound (c) (10.0 g) dissolved in tetrahydrofuran (THF) (40 mL) was cooled to −78° C., a 1.6 M butyllithium/hexane solution (30 mL) was slowly added dropwise and the mixture was stirred at the same temperature for 2 hours. Triisopropyl borate (14.0 g) dissolved in THF (20 mL) was then slowly added dropwise at −78° C., and the mixture was stirred at the same temperature for 1 hour. The temperature was increased to room temperature and the final solution was stirred. After adding 3 M hydrochloric acid (200 mL) dropwise at ice-cooling temperature, the aqueous layer was extracted three times with ether. The organic layers were combined, washed with water and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain 8.28 g of Compound (d).

Provenance & Evidence