Pyridine → 2-[2-(3-chloro-pyridin-2-yl)-5-hydroxy-2H-pyrazol-3-yl]-10-methyl-3-oxa-1,8-diaza-phenanthren-4-one

Participants

Reaction Steps

To a suspension of 282 mg (1.39 mmol) of 6-amino-7-methyl-quinoline-5-carboxylic acid in 11 mL of anhydrous THF is added 407 mg (1.39 mmol) of 2-(3-chloro-pyridin-2-yl)-5-trifluoromethyl-2H-pyrazole-3-carboxylic acid followed by 560 μL (7.0 mmol) of pyridine. The mixture is stirred at ambient temperature during 30 minutes. Then the suspension is cooled to 0° C. and 430 μL (5.5 mmol) of methanesulfonyl chloride are added dropwise. The mixture is stirred at ambient temperature for 48 hours. Then the solvent is evaporated and the residue is sequentially triturated and filtrated with ethyl acetate and with a minimum of cold water. Purification of the residue by flash chromatography (SiO2, heptane/ethyl acetate 1:2) affords 286 mg (45%) of the product as a yellowish solid; LC/MS:468/460 (M+H)+.

Provenance & Evidence