Ethylenediamine → 2-(5-chloro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid [(R)-1-(4-cyano-piperidine-1-carbonyl)-2,2-dimethyl-propyl]-amide

Participants

Reaction Steps

In a round-bottomed flask, 2-(5-chloro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid [(R)-1-(4-cyano-piperidine-1-carbonyl)-2,2-dimethyl-propyl]-amide (0.158 g, 0.193 mmol) was dissolved in dichloromethane (1 ml) and trifluoroacetic acid (0.6 ml, 7.8 mmol) was added. The reaction mixture was stirred at room temperature for 2 h then concentrated. The residue was redissolved in dichloromethane (1 ml) and ethylenediamine (0.8 ml, 11.7 mmol) was added. The solution was stirred at room temperature for 1 h then quenched with water and extracted with EtOAc (2×). The combined organic layers were washed with water and brine then dried over sodium sulfate, filtered and concentrated. The residue was purified by chromatography over silica gel with EtOAc/hexanes (gradient 0-100% EtOAc) to afford 26 mg (24%) of 2-(5-chloro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid [(R)-1-(4-cyano-piperidine-1-carbonyl)-2,2-dimethyl-propyl]-amide as an off-white solid. MS: (M+H)+=533; 1H NMR (DMSO-d6, 300 MHz): δ (ppm) 12.92 (br. s., 1H), 9.09 (s, 1H), 8.73 (d, J=6.8 Hz, 1H), 8.61 (t, J=8.1 Hz, 1H), 8.46 (d, J=9.1 Hz, 1H), 7.80 (d, J=9.1 Hz, 1H), 7.50 (d, J=9.1 Hz, 1H), 5.20 (d, J=9.4 Hz, 1H), 4.19 (s, 3H), 3.97-4.12 (m, 1H), 3.35-3.91 (m, 2H), 3.01-3.23 (m, 2H), 1.39-2.07 (m, 4H), 1.04 (d, J=6.4 Hz, 9H).

Provenance & Evidence