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

関与物質

反応手順

In a round-bottomed flask, 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((S)-1,2,2-trimethyl-propyl)-amide (102 mg, 0.194 mmol) was dissolved in dichloromethane (0.9 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 dissolved in dichloromethane (0.9 ml) and ethylenediamine (0.8 ml, 11.7 mmol) was added. The yellow solution was stirred at room temperature for 1 h then quenched with water and diluted with ethyl acetate. The suspension was filtered, washed with hot water and ethyl acetate and dried under high vacuum to provide 52 mg (64%) of 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((S)-1,2,2-trimethyl-propyl)-amide as a light yellow powder. MS: (M+H)+=395; 1H NMR (DMSO-d6, 300 MHz): δ (ppm) 12.38 (br. s., 1H), 9.08 (s, 1H), 8.44 (s, 1H), 8.40 (dd, J=9.1, 5.3 Hz, 1H), 8.03 (d, J=9.8 Hz, 1H), 7.69 (dd, J=9.8, 1.9 Hz, 1H), 7.20 (td, J=9.1, 2.3 Hz, 1H), 4.15 (s, 3H), 4.09-4.19 (m, 1H), 1.26 (d, J=6.8 Hz, 3H), 0.93 (s, 9H).

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