Trifluoroacetic acid → 2-(3-piperidin-4-yl-indazol-1-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (2-hydroxy-1,1-dimethyl-ethyl)-amide

Participants

Reaction Steps

To a stirred solution of tert-butyl 4-(1-(7-(1-hydroxy-2-methylpropan-2-ylcarbamoyl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl)-1H-indazol-3-yl)piperidine-1-carboxylate (22 mg, 33.1 μmol) in dichloromethane (2 mL) was added trifluoroacetic acid (0.5 mL). After 15 h then mixture was concentrated in vacuo then 25 mL of a Jan. 10, 1960 mixture of ammonium hydroxide/methanol/dichloromethane added. After 1 h the mixture was concentrated in vacuo. Purification by chromatography (silica, 24 g Analogix column, 0-5% methanol containing 10% ammonium hydroxide in dichloromethane) gave 2-(3-piperidin-4-yl-indazol-1-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (2-hydroxy-1,1-dimethyl-ethyl)-amide (14 mg, 98%). MS (M+H)+=434; 1H NMR (DMSO-d6) δ: 8.98 (s, 1H), 8.63 (d, J=8.5 Hz, 1H), 8.37 (s, 1H), 8.01 (d, J=8.1 Hz, 1H), 7.65 (s, 1H), 7.57 (t, J=7.8 Hz, 1H), 7.30-7.41 (m, 1H), 3.61 (s, 4H), 3.20 (br. s., 3H), 2.80-2.93 (m, 2H), 1.88-2.12 (m, 2H), 1.43 (s, 6H).

Provenance & Evidence