Triisopropyl borate → HCID 60209342, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-(3-bromo-phenyl)-4-methyl-6-(4-trifluoromethyl-phenyl)-pyridine (example E.90) (1.23 g, 3.13 mmol) in TBME (80 mL) at −78° C. was added n-BuLi (1.6 M in hexane, 3.2 mL, 5.0 mmol) keeping the internal temperature below −60° C. (ca. 3 min), stirring was continued at −78° C. for 25 min, then triisopropyl borate (1.5 mL, 6.27 mmol) was added quickly, causing the internal temperature to rise to −60° C., stirring was continued at −78° C. for 20 min. The mixture was quenched by addition of 1M NaH2PO4.2H2O-solution, the cooling bath was removed and the mixture was allowed to warm to 0° C. and stirred at 0° C. for 10 min. Diluted with EtOAc and brine, extracted three times with EtOAc, dried the combined organic layers over Na2SO4. Removal of the solvent in vacuum left the title compound as a light brown foam (1.20 g, 70.5%, purity: 65.8%), which was used without further purification. MS (ISP) 358.2 [(M+H)+].

Provenance & Evidence