Ethylenediamine → 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid methoxy-amide

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To a stirred solution of 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid methoxy-amide (53 mg, 113 μmol) in dichloromethane (2 mL) was added trifluoroacetic acid (0.4 mL, 5.19 mmol) at 20° C. After 2 h, the mixture was concentrated in vacuo. The residue was diluted with dichloromethane and concentrated again. The residue was then suspended in dichloromethane (2 mL) and ethylenediamine (0.4 mL, 5.92 mmol) added. The mixture was stirred for 1 h, then concentrated in vacuo. To the residue was added ethyl acetate and water. The organic layer was then washed with brine then dried (sodium sulfate), filtered and concentrated in vacuo. Purification by chromatography (silica, 25 g pre-packed SiliCycle cartridge, 40-80% EtOAc in hexane gradient increasing over 15 min) gave 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid methoxy-amide (45 mg, 0.39 μmol, 39%) as a light yellow powder. MS (M+H)+=341; 1H NMR (DMSO-d6) δ: 12.87 (br. s., 1H), 10.97 (s, 1H), 9.09 (s, 1H), 8.66 (dd, J=8.8, 5.3 Hz, 1H), 8.45 (s, 1H), 7.67 (d, J=9.8 Hz, 1H), 7.24 (t, J=9.3 Hz, 1H), 4.15 (s, 3H), 3.84 (s, 3H).

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