Water → 4-(1-cyclopentyl-4-oxo-4,5-dihydro-1H-pyrazolo[4,3-c]pyridin-3-yl)thiophene-2-carbonitrile

Participants

Reaction Steps

To a solution of 4-(1-cyclopentyl-4-oxo-4,5-dihydro-1H-pyrazolo[4,3-c]pyridin-3-yl)thiophene-2-carboxamide (25 mg) obtained in Example 13 in DMA (5 mL) was added trifluoroacetic anhydride (240 mg) under ice-cooling, and the mixture was stirred under nitrogen atmosphere at room temperature for 1 hr. To the reaction mixture was added water, the precipitate was collected by filtration, and the obtained solid was crystallized from ethyl acetate and hexane to give the title compound (16.7 mg).

Provenance & Evidence