Trifluoroacetic acid → N-tert-butyl-2-(methyl(pyridin-3-yl)amino)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide

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N-tert-butyl-2-(methyl(pyridin-3-yl)amino)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (38 mg, 83.6 μmol) was dissolved in dichloromethane (1.5 mL) and treated with trifluoroacetic acid (191 mg, 129 μL, 1.67 mmol). After 16 h, the mixture was concentrated and the residue re-dissolved in dichloromethane (1.5 mL), methanol (0.75 mL) and ammonium hydroxide (0.2 mL) and the mixture stirred at room temperature for 1 h. The mixture was concentrated then triturated with water and filtered to obtain a solid. This was washed with ether then dried to give N-tert-butyl-2-(methyl(pyridin-3-yl)amino)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (16 mg, 49.3 μmol, 59%) as a light yellow solid. 1H NMR (400 MHz, DMSO-d) δ ppm: 12.33 (s, 1H), 8.64 (d, J=2.5, 1 H), 8.40 (dd, J=4.7, 1.2, 1 H), 8.05 (d, J=3.1, 1 H), 7.96 (s, 1H), 7.92 (s, 1H), 7.82 (m, 1H), 7.46 (m, 1H), 3.50 (s, 3H), 1.32 (s, 9H); MS (EI/CI) m/z: 325.1 [M+H].

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