Trifluoroacetic acid → N-(3-fluoro-4-(1-(4-methoxybenzyl)-3-(piperidin-4-ylmethyl)-1H-pyrazolo[3,4-b]pyridin-4-yloxy)phenyl)-4-(4-fluorophenyl)-3-oxo-3,4-dihydropyrazine-2-carboxamide

Participants

Reaction Steps

Dissolved tert-butyl 4-((4-(2-fluoro-4-(4-(4-fluorophenyl)-3-oxo-3,4-dihydropyrazine-2-carboxamido)phenoxy)-1-(4-methoxybenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)methyl)piperidine-1-carboxylate (43 mg, 0.055 mmol) in DCM (1 mL) and added excess TFA (d 1.48) (0.100 ml). The mixture was stirred at room temperature for 18 hours. The solvent was removed, and the crude was partitioned between DCM (15 mL) and aqueous 10% Na2CO3 (20 mL). The organic layer was washed with brine, dried over sodium sulfate and evaporated to afford title compound as free-base. Yield 41 mg, 89% purity by HPLC, 97%. LRMS (APCI pos) m/e 678.3 (M+H).

Provenance & Evidence