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

Participants

Reaction Steps

To a suspension of 400 mg (1.89 mmol) of 6-amino-5-chloro-1H-indazole-7-carboxylic acid in 16 mL of anhydrous tetrahydrofuran is added 479 mg (1.89 mmol) of 2-(3-chloro-pyridin-2-yl)-5-methoxy-2H-pyrazole-3-carboxylic acid followed by 684 μL (8.50 mmol) of pyridine. The mixture is stirred at ambient temperature during 30 minutes. Then the suspension is cooled to 0° C. and 516 μL (6.66 mmol) of methanesulfonyl chloride are added dropwise. The mixture is stirred 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 (870 mg) is engaged in the next step; LC/MS:530/532 (M+H)+.

Provenance & Evidence