Pyridine → HCID 178487785, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of 400 mg (1.38 mmol) of 6-amino-3-bromo-5-chloro-1H-indazole-7-carboxylic acid in 16 mL of anhydrous tetrahydrofuran at 10° C., is added 349 mg (1.38 mmol) of 2-(3-chloro-pyridin-2-yl)-5-methoxy-2H-pyrazole-3-carboxylic acid followed by 499 μL (6.20 mmol) of pyridine. Then the suspension is cooled to 0° C. and 376 μL (4.82 mmol) of methanesulfonyl chloride are added dropwise. The mixture is stirred at ambient temperature over the night. The reaction is not complete and therefore 166 μL (2.07 mmol) of pyridine are added followed by 349 mg (1.38 mmol) of 2-(3-chloro-pyridin-2-yl)-5-methoxy-2H-pyrazole-3-carboxylic acid. The reaction is stirred again at ambient temperature for 5 hours. Then the solvent is evaporated and the residue is triturated with a minimum of cold water. The precipitate, which is formed is filtrated and washed with cold water. The pale yellowish product obtained is purified by flash chromatography (SiO2, heptane/ethyl acetate 1:1) affords 200 mg (0.47 mmol, 34%) of the product as a solid; LC/MS:509/511 (M+H)+.

Provenance & Evidence