Trifluoroacetic acid → N-tert-butyl-2-(1,5-dimethyl-1H-pyrazol-4-ylamino)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide

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Reaction Steps

To a solution of N-tert-butyl-2-(1,5-dimethyl-1H-pyrazol-4-ylamino)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (45 mg, 98.3 μmol) in dichloromethane (1.5 mL) was added trifluoroacetic acid (224 mg, 152 μL, 1.97 mmol) and the mixture stirred at room temperature for 16 h. The reaction mixture was concentrated in vacuo and the residue obtained diluted with dichloromethane (1.5 mL), methanol (0.75 mL) and ammonium hydroxide (0.2 mL) and stirred at room temperature for 2 h. The reaction mixture was concentrated then purified by chromatography (silica, 10-45% of a 1:4 methanol:dichloromethane solution in dichloromethane) to give N-tert-butyl-2-(1,5-dimethyl-1H-pyrazol-4-ylamino)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (18 mg, 55.0 μmol, 56%) as a yellow solid. 1H NMR (400 MHz, DMSO-d) δ ppm: 12.10 (s, 1H), 8.39 (s, 1H), 7.87 (s, 1H), 7.86 (s, 1H), 7.85 (d, J=3.3, 1 H), 3.71 (s, 3H), 2.16 (s, 3H), 1.30 (s, 9H); MS (EI/CI) m/z: 328.2 [M+H].

Provenance & Evidence