Diethyl Ether → 4,4-Difluoro-1-[6-(1-hydroxy-1-methyl-ethyl)-pyridin-3-yl]-cyclohexanecarbonitrile

Participants

Reaction Conditions

Reaction Steps

A solution of 1-(6-acetyl-pyridin-3-yl)-4,4-difluoro-cyclohexanecarbonitrile (17 mg, 0.064 mmol) in THF (1.2 mL) was cooled at −50° C. and treated with a 3.0 M solution of methylmagnesium bromide in ether (110 μL, 0.32 mmol). After stirring at −50° C. for 3 hours, the reaction was quenched by adding saturated aqueous ammonium chloride (5 mL) and stirred at room temperature for a few minutes. AcOEt (5 mL) was added and the biphasic mixture was stirred vigorously for a few seconds. The layers were separated and the aqueous layer was extracted again with AcOEt (5 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated under reduced pressure. The residue was then purified by preparative TLC, eluting with 60% AcOEt in hexanes to afford 4,4-difluoro-1-[6-(1-hydroxy-1-methyl-ethyl)-pyridin-3-yl]-cyclohexanecarbonitrile as a colorless oil (8.7 mg, 48%). LC-MS (m/z) 280.0 (MH+); tR=1.11.

Provenance & Evidence