Trifluoroacetic acid → 2-(6-fluoro-1-(3-hydroxybutyl)-1H-indazol-3-yl)-N-(1-hydroxy-2-methylpropan-2-yl)-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide

Beteiligte Stoffe

Reaktionsschritte

To a stirred solution of N-(1-(tert-butyldimethylsilyloxy)-2-methylpropan-2-yl)-2-(6-fluoro-1-(3-hydroxybutyl)-1H-indazol-3-yl)-5-trityl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide in dichloromethane (2 mL) was added drop-wise trifluoroacetic acid (1 mL) at room temperature and the reaction mixture was stirred for 1 hour. The solvent was removed under reduced pressure. The residue was dissolved in dichloromethane and washed with NaHCO3 (aqueous), The organic layer was concentrated, and 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: 36% acetonitrile/64% water (0.1% trifluoroacetic acid, v/v) initially, and then proceed to 42% acetonitrile/58% water (0.1% trifluoroacetic acid, v/v) in a linear fashion after just 9 min.) to give 2-(6-fluoro-1-(3-hydroxybutyl)-1H-indazol-3-yl)-N-(1-hydroxy-2-methylpropan-2-yl)-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide (10 mg, 45% over three steps) as a white solid. LCMS: (M+H)+=441; 1H NMR (300 MHz, CD3OD): δ 9.15 (s, 1H), 8.58 (dd, 1H, J1=9. Hz, J2=5.4 Hz), 8.29 (s, 1H), 7.42 (d, 1H, J=7.8 Hz), 7.10 (d, 1H, J=7.2 Hz), 4.62-4.56 (m, 2H), 3.82 (s, 2H), 3.76 (brs, 1H), 2.19-2.13 (m, 2H), 2.04-1.99 (m, 2H), 1.55 (s, 6H), 1.22 (d, 3H, J=6.3 Hz).

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