Thionyl Chloride → 2,6-dichloro-N-[5-(3,5-difluorobenzyl)-1H-indazol-3-yl]pyridine-3-carboxamide

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Reaction Steps

2,6-dichloropyridine-3-carboxylic acid (480 mg, 2.5 mmol) and thionyl chloride (0.28 mL, 3.75 mmol) were heated in toluene dry (120 mL) and a few drops of dry DMF at 90° C. for 2 hours Volatiles were evaporated and the residue dissolved in dry pyridine (15 mL) at 0° C. under nitrogen atmosphere. A solution of 5-(3,5-difluoro-benzyl)-1H-indazol-3-ylamine (518 mg, 2 mmol) in dry pyridine (7 mL) was added to the cooled reaction mixture. The resulting mixture was allowed to react overnight at room temperature, then the solvent removed under reduced pressure. The residue was taken-up with EtOAc and washed with acqueous NaHCO3 sat.sol., water and brine. Organic phase was dried over sodium sulfate and evaporated to dryness. The crude was purified by flash chromatography on silica gel using DCM/EtOH 100:4 as the eluant, affording 300 mg of the title compound.

Provenance & Evidence