Trifluoroacetic acid → 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid [(R)-1-(1-cyano-cyclopentyl)-ethyl]-amide

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Reaction Steps

To a solution of 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid [(R)-1-(1-cyano-cyclopentyl)-ethyl]-amide (140 mg, 0.25 mmol) in CH2Cl2 (2 mL) was added TFA (0.75 mL). The reaction mixture was stirred at room temperature for 4 h then concentrated. The residue was redissolved in 10:90:0.5 MeOH/CH2Cl2/NH4OH (3 mL) and stirred at room temperature for 3 h then concentrated. The residue was purified by silica gel chromatography with 0% to 5% MeOH/EtOAc to afford 92 mg (86%) of 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid [(R)-1-(1-cyano-cyclopentyl)-ethyl]-amide as a light yellow powder. MS (M+Na)+=454; mp=300-315° C.; 1H NMR (DMSO-d6, 300 MHz): δ (ppm) 12.96 (br. s., 1H), 9.11 (s, 1H), 8.51-8.56 (m, 1H), 8.50 (s, 1H), 8.19 (d, J=9.1 Hz, 1H), 7.67 (dd, J=9.8, 1.9 Hz, 1H), 7.15 (td, J=9.1, 2.3 Hz, 1H), 4.34-4.50 (m, 1H), 4.14 (s, 3H), 1.92-2.14 (m, 3H), 1.63-1.90 (m, 5H), 1.46 (d, J=6.8 Hz, 3H).

Provenance & Evidence