Sodium borohydride → 2,2-Difluoro-2-(2-pyridyl)-1-methoxyethanol

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Reaction Steps

Ethyl difluoro(2-pyridyl)acetate (1.00 g, 4.97 mmol, from EXAMPLE 202, Step B) was dissolved in CH3OH (15 mL) in a 3-neck round bottom flask fitted with a mechanical stirrer, and the resulting solution was cooled in a dry iceli-PrOH bath. Sodium borohydride (114 mg, 3.0 mmol) was added in 2 portions 15 min. apart. After an additional 55 min., the cold reaction was quenched by the addition of saturated aq. NH4Cl (6.5 mL) over 12 min. After 10 min., the cooling bath was removed and the mixture was stirred for 35 min. before being diluted with saturated aq. NaCl (100 mL) and extracted with EtOAc (4×75 mL). The combined organic layers were dried (Na2SO4), decanted, and evaporated to give 1.02 g of crude 2,2-difluoro-2-(2-pyridyl)-1-methoxyethanol as an amber oil.

Provenance & Evidence