反应详情

2-(6-Chloro-4-fluoro-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (140 mg, 0.30 mmol), O-benzotriazol-1-yl-N,N,N′,N′-tetramethyluronium tetrafluoroborate (146 mg, 0.46 mmol), N,N-diisopropylethylamine (0.27 ml, 1.52 mmol) and isopropylamine (31 ul, 0.36 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 77 mg (51%) of 2-(6-chloro-4-fluoro-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamide.

1. customThe layers were separated
2. extractionthe aqueous layer was extracted twice more with ethyl acetate
3. washThe combined organic layers were washed with sodium chloride solution
4. dry with materialdried over sodium sulfate
5. customAfter evaporation
6. customthe residue was purified by silica gel chromatography (methanol/dichloromethane)