Pyridine → 7-[2-(3-chloro-pyridin-2-yl)-5-difluoromethyl-2H-pyrazol-3-yl]-5-methyl-1H-8-oxa-1,2,6-triaza-cyclopenta[a]naphthalen-9-one

Participants

Reaction Steps

To a suspension of 540 mg (2.82 mmol) of 6-amino-5-methyl-1H-indazole-7-carboxylic acid in 20 mL of anhydrous acetonitrile is added 771 mg (2.82 mmol) of 2-(3-chloro-pyridin-2-yl)-5-difluoromethyl-2H-pyrazole-3-carboxylic acid followed by 1.02 mL (12.7 mmol) of pyridine. The mixture is stirred at ambient temperature during 30 minutes. Then the suspension is cooled to 0° C. and 766 μL (9.9 mmol) of methanesulfonyl chloride is added dropwise. The mixture is stirred at 50° C. for 16 hours. Then the solvent is evaporated and the residue is triturated with a minimum of cold water. The precipitate, which is formed is filtrated, washed with cold water and dried. The pale yellowish product obtained is engaged in the next step; LC/MS:429/431 (M+H)+.

Provenance & Evidence