Diisopropylethylamine → 2-(6-chloro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (1H-imidazol-2-yl)-amide

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A solution of 2-(6-chloro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (205 mg, 0.447 mmol), 1 mL of N,N-dimethylformamide and O-(7-azabenzotriazole-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (208 mg, 0.548 mmol) was stirred 10 min. To the solution was added freshly ground 2-aminoimidazole sulfate (62 mg, 0.468 mmol) and diisopropylethylamine (0.39 mL, 2.2 mmol). The flask was heated to 70° C. and the cloudy yellow solution was stirred 18.5 h, during which time a white precipitate formed. The mixture was allowed to cool, then treated with 20 mL of water. The precipitate was isolated by Buchner filtration, rinsing well with water and dried by air then in vacuo to afford 177 mg of impure 2-(6-chloro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (1H-imidazol-2-yl)-amide as a pale yellow solid. MS: (M+H)+=523.

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