2,2-Difluoroethan-1-ol → Ethyl 2-(2,2-Difluoroethyl)oxy-5-nitro-benzoate

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Reaction Steps

A mixture of 2,2-difluoroethanol (0.178 mL, 2.82 mmol) and KOtBu (0.319 g, 2.70 mmol) in 10 mL THF was stirred for 5 min, then ethyl 2-fluoro-5-nitrobenzoate (0.500 g, 2.35 mmol) was added and it was stirred at rt overnight. Additional 60 μL 2,2-difluoroethanol and 110 mg KOtBu were added and it was stirred for 2 h. The mixture was diluted with H2O, concentrated i.vac. and extracted 2× with EtOAc. The combined organic layers were dried with Na2SO4 and concentrated to furnish the subtitle compound. Yield: 0.52 g (81%); TLC: Rf=0.85 (silica gel, DCM:EtOH 99:1).

Provenance & Evidence