Cesium carbonate → 5-Cyclopropyl-6-(tetrahydro-furan-2-ylmethoxy)-pyridine-2-carboxylic acid

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Palladium(II)acetate (1.19 mg, 5.3 μmol), butylbis(tricyclo[3.3.1.13,7]dec-1-yl)-phosphine (2.85 mg, 7.94 μmol, CAN 321921-71-5), potassium cyclopropyltrifluoroborate (39.6 mg, 267 μmol) and cesium carbonate (259 mg, 794 μmol) were combined to give a white solid. To this solid a degassed solution of 5-bromo-6-(tetrahydro-furan-2-ylmethoxy)-pyridine-2-carboxylic acid (80 mg, 265 μmol) in toluene (2.02 mL)/water (224 μL) was added through a septum cap. The reaction mixture was heated to 120° C. and stirred for 20 h. After cooling to ambient temperature the reaction mixture was diluted with water (2 mL), poured onto 20 mL ice water/brine/1 N HCl, extracted with isopropyl acetate (2×40 mL), and washed with 20 mL ice water/brine. The organic layers were dried with Na2SO4 and concentrated in vacuo to give a light brown oily residue which was purified by preparative TLC (silica gel, 2.0 mm, DCM/MeOH, 49:1). The title compound (25 mg, 36%) was isolated as light yellow liquid; MS (ESI): 262.0 [M−H]−.

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