反应详情

2-(6-Chloro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-2-methanesulfonyl-1-methyl-ethyl)-amide (65 mg, 0.113 mmol) was dissolved in dichloromethane (0.8 ml) and then stirred in an ice bath. Trifluoroacetic acid (0.4 ml) was slowly added and the ice bath was removed. The reaction was stirred at room temperature for 3 h then cooled in ice bath. Sodium bicarbonate solution was added and the mixture was extracted three times with ethyl acetate. The combined organic layers were washed with sodium chloride solution and dried over sodium sulfate. After evaporation, the residue was dissolved in absolute ethanol (7 ml) and sodium acetate (185 mg, 2.25 mmol) was added. The mixture was stirred for 20 h at 60° C. The reaction was cooled, and water and ethyl acetate were added. The aqueous layer was extracted twice more with ethyl acetate. The combined organic layers were washed with sodium chloride solution, dried over sodium sulfate and evaporated to a residue. After purification by silica gel chromatography (methanol/dichloromethane), 18.6 mg (37%) of 2-(6-chloro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((R)-2-methanesulfonyl-1-methyl-ethyl)-amide was obtained. MS: (M+H)+=447; mp=287-290° C. 1H NMR (300 MHz, DMSO-d6) δ ppm 12.91 (s, 1H) 9.10 (s, 1H) 8.54 (d, J=8.7 Hz, 1H) 8.47 (s, 1H) 8.26 (d, J=7.9 Hz, 1H) 7.97-8.02 (m, 1H) 7.35 (dd, J=8.7, 1.5 Hz, 1H) 4.60-4.72 (m, 1H) 4.18 (s, 3H) 3.45-3.63 (m, 2H) 3.06 (s, 3H) 1.52 (d, J=6.8 Hz, 3H).

1. customthe ice bath was removed
2. stirringThe reaction was stirred at room temperature for 3 h
3. temperaturethen cooled in ice bath
4. additionSodium bicarbonate solution was added
5. extractionthe mixture was extracted three times with ethyl acetate
6. washThe combined organic layers were washed with sodium chloride solution
7. dry with materialdried over sodium sulfate
8. customAfter evaporation
9. dissolutionthe residue was dissolved in absolute ethanol (7 ml)
10. stirringThe mixture was stirred for 20 h at 60° C
11. temperatureThe reaction was cooled
12. extractionThe aqueous layer was extracted twice more with ethyl acetate
13. washThe combined organic layers were washed with sodium chloride solution
14. dry with materialdried over sodium sulfate
15. customevaporated to a residue
16. customAfter purification by silica gel chromatography (methanol/dichloromethane)