Trifluoroacetic acid → 2-(5-(difluoromethoxy)-1-(3-(dimethylamino)propyl)-1H-indazol-3-yl)-N-(1-hydroxy-2-methylpropan-2-yl)-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide

Participants

Reaction Steps

To the solution of N-(1-(tert-butyldimethylsilyloxy)-2-methylpropan-2-yl)-2-(5-(difluoromethoxy)-1-(3-(dimethylamino)propyl)-1H-indazol-3-yl)-5-trityl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide (88 mg, 0.12 mmol) in 3 mL of dichloromethane was added 3 mL of trifluoroacetic acid. The reaction mixture was stirred overnight at room temperature. After solvent evaporation, the residue was purified by preparative-HPLC (Gemini 5u C18 150×21.2 mm; inject volume: 3 mL/inj, flow rate: 20 mL/min; wavelength: 214 nm and 254 nm; the gradient conditions are: 40% acetonitrile/60% water (0.1% trifluoroacetic acid V/V) initially, and then proceed to 50% acetonitrile/50% water (0.1% trifluoroacetic acid V/V) in a linear fashion after just 9 min) to afford 2-(5-(difluoromethoxy)-1-(3-(dimethylamino)propyl)-1H-indazol-3-yl)-N-(1-hydroxy-2-methylpropan-2-yl)-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide as yellow solid (22 mg, 34.5%). LCMS: (M+H)+=502; 1H NMR (300 MHz, CD3OD): δ 9.04 (s, 1H), 8.17 (s, 1H), 8.11 (s, 1H), 7.66 (d, 1H, J=8.7 Hz), 7.35 (d, 1H, J=8.1 Hz), 6.85 (t, 1H, J=74.1 Hz), 4.59 (s, 2H), 3.84 (s, 2H), 3.34-3.32 (m, 2H), 2.89 (s, 6H), 2.44 (s, 2H), 1.64 (s, 6H).

Provenance & Evidence