[CH:1]1([N:6]2[C:14]3[CH:13]=[CH:12][NH:11][C:10](=[O:15])[C:9]=3[C:8]([C:16]3[CH:17]=[C:18]([C:21]([NH2:23])=O)[S:19][CH:20]=3)=[N:7]2)[CH2:5][CH2:4][CH2:3][CH2:2]1.FC(F)(F)C(OC(=O)C(F)(F)F)=O.O>CC(N(C)C)=O>[CH:1]1([N:6]2[C:14]3[CH:13]=[CH:12][NH:11][C:10](=[O:15])[C:9]=3[C:8]([C:16]3[CH:17]=[C:18]([C:21]#[N:23])[S:19][CH:20]=3)=[N:7]2)[CH2:2][CH2:3][CH2:4][CH2:5]1To 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).
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