Isopropylamine → 2-[6-Chloro-1-(2-dimethylamino-ethyl)-4-fluoro-1H-indazol-3-yl]-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamide

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2-[6-Chloro-1-(2-dimethylamino-ethyl)-4-fluoro-1H-indazol-3-yl]-5-(2-trimethylsilanylethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (50 mg, 0.094 mmol), O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium tetrafluoroborate (45 mg, 0.14 mmol), N,N-diisopropylethylamine (0.08 ml, 0.47 mmol) and isopropylamine (10 ul, 0.11 mmol) were added together in acetonitrile (1 ml). The reaction was stirred at room temperature for 18 h then water and ethyl acetate were added. The layers were separated and the aqueous layer was extracted twice more with ethyl acetate. The combined organic layers were washed with sodium chloride solution and dried over sodium sulfate. After evaporation, the residue was purified by silica gel chromatography (methanol/dichloromethane) to give 35 mg (65%) of 2-[6-chloro-1-(2-dimethylamino-ethyl)-4-fluoro-1H-indazol-3-yl]-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamide.

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