Potassium Carbonate → Ethyl 5-(2,2-difluoroethoxy)-3-fluoro-pyridine-2-carboxylate

반응식

[F:1][C:2]1[C:3]([C:9]([O:11][CH2:12][CH3:13])=[O:10])=[N:4][CH:5]=[C:6](F)[CH:7]=1.[F:14][C:15]([F:18])(O)[CH3:16].C(=O)([O-])[O-:20].[K+].[K+]>C(#N)C>[F:14][CH:15]([F:18])[CH2:16][O:20][C:6]1[CH:7]=[C:2]([F:1])[C:3]([C:9]([O:11][CH2:12][CH3:13])=[O:10])=[N:4][CH:5]=1

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실험 절차

Ethyl 3,5-difluoropyridine-2-carboxylate (0.98 g, 5.24 mmol) is dissolved in acetonitrile (20 mL). Difluoroethanol (430 μL, 6.81 mmol) is added followed by potassium carbonate (1.83 g, 13.09 mmol). The solution is stirred at room temperature for 2 days then filtered and the filtrate is concentrated. The crude material is purified via silica gel chromatography eluting with a 0-25-50% ethyl acetate/hexanes gradient to give the title compound (242 mg, 18%). ES/MS (m/e): 250.0 (M+1).