Diisopropylethylamine → tert-butyl 2-(2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamido)-2-methylpropanoate

Participants

Reaction Steps

A solution of 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (100 mg, 0.323 mmol), tert-butyl 2-amino-2-methylpropanoate hydrochloride (82 mg, 0.42 mmol), HATU (160 mmol, 0.42 mmol) and DIPEA (66 mg, 0.51 mmol) in 6 mL of DMF was stirred at room temperature for 16 hours. The solvent was evaporated at 70° C. under reduced pressure and the residue was purified by column chromatography (silica gel, 200-300 mesh, eluting with a mixture of petroleum ether and ethyl acetate (1:1, v/v) to give tert-butyl 2-(2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamido)-2-methylpropanoate (75 mg, 51.8%) as a white solid. MS: (M+H)+=453; 1H NMR (300 MHz, DMSO): δ 13.93 (s, 1H), 9.13 (s, 1H), 8.57-8.52 (m, 1H), 8.48 (s, 1H), 8.30 (s, 1H), 7.72 (dd, 1H, J=9.8, 2.1 Hz), 7.21-7.15 (m, 1H), 4.18 (s, 3H), 1.63 (s, 6H), 1.25 (s, 9H).

Provenance & Evidence