Trifluoroacetic acid → HCID 178480815, compound

Participants

Reaction Steps

A 17:83 mixture of N-(4-(1-(4-methoxybenzyl)-3-(5-((4-methylpiperazin-1-yl)methyl)furan-3-yl)-1H-pyrazolo[3,4-b]pyridin-4-yloxy)-3-fluorophenyl)-N-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide and N-(4-(1-(4-methoxybenzyl)-3-(3-bromo-5-((4-methylpiperazin-1-yl)methyl)furan-2-yl)-1H-pyrazolo[3,4-b]pyridin-4-yloxy)-3-fluorophenyl)-N-(4-fluorophenyl)-cyclopropane-1,1-dicarboxamide (26 mg, 0.035 mmol) were heated with TFA (0.5 mL) at 80° C. for 2 hours in a sealed vessel. After cooling to ambient temperature, the mixture was concentrated in vacuo, using toluene to azeotrope. The resulting solid was portioned between EtOAc (5 mL) and 1:1 saturated aqueous NaHCO3/water (5 mL). The phases were separated, and the aqueous phase was re-extracted with EtOAc. The combined organic phases were washed with brine (5 mL), dried (Na2SO4), filtered, and concentrated. The crude products were separated by preparative TLC (0.5 mm thickness; N-(4-(3-(3-bromo-5-((4-methylpiperazin-1-yl)methyl)furan-2-yl)-1H-pyrazolo[3,4-b]pyridin-4-yloxy)-3-fluorophenyl)-N-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide: Rf=0.33; N-(3-fluoro-4-(3-(5-((4-methylpiperazin-1-yl)methyl)furan-3-yl)-1H-pyrazolo[3,4-b]pyridin-4-yloxy)phenyl)-N-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide: Rf=0.25), eluting with 10% MeOH (containing 7N NH3) in CHCl3. The product, N-(3-fluoro-4-(3-(5-((4-methylpiperazin-1-yl)methyl)furan-3-yl)-1H-pyrazolo[3,4-b]pyridin-4-yloxy)phenyl)-N-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide, was obtained as a white powder (1 mg, 5%). HPLC: 98% purity (254 nm); LRMS (ESI+): 100% purity, 220 nm, 628 m/z (M+1) detected; 1H NMR (400 MHz, CDCl3) δ 10.06 (s, 1H), 8.32 (d, J=5 Hz, 1H), 8.18 (m, 2H), 7.77 (m, 1H), 7.45 (m, 2H), 7.24 (m, 1H), 7.07 (t, J=9 Hz, 2H), 6.92 (s, 1H), 6.32 (d, J=5 Hz, 1H), 3.62 (s, 2H), 2.64 (br s, 8H), 2.37 (s, 3H), 1.83 (m, 2H), 1.63 (m, 2H).

Provenance & Evidence