反应详情

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 (35 mg, 0.06 mmol) was dissolved in dichloromethane (1.6 ml) and cooled in ice bath. Trifluoroacetic acid (0.8 ml) was slowly added and the reaction was stirred at room temperature for 2 h. The reaction was evaporated and the residue was dissolved in dichloromethane (1 ml). Ethylenediamine (0.25 ml, 3.7 mmol) was added and the mixture was stirred for 18 h. Water and then ethyl acetate were added to the mixture. The layers were separated and the aqueous layer was extracted three times with ethyl acetate. The combined organic layers were washed with sodium chloride solution, dried over sodium sulfate and evaporated. The residue was purified by silica gel chromatography (methanol/dichloromethane). The product thus isolated was dissolved in methanol/dichloromethane and treated with 4 eq of 4 M HCl in 1,4-dioxane. Evaporation of the solvent provided a solid which was dried under high vacuum to afford 18 mg (62%) of 2-[6-chloro-1-(2-dimethylamino-ethyl)-4-fluoro-1H-indazol-3-yl]-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid isopropylamide hydrochloride. MS: (M+H)+=444; mp=281-283° C. 1H NMR (300 MHz, DMSO-d6) δ: 10.17-10.33 (m, 1H), 9.08 (s, 1H), 8.44 (d, J=3.0 Hz, 1H), 8.26 (d, J=7.9 Hz, 1H), 8.03-8.08 (m, 1H), 7.34 (d, J=10.6 Hz, 1H), 4.94-5.05 (m, 2H), 4.14-4.30 (m, 1H), 3.66-3.77 (m, 2H), 2.89 (d, J=4.5 Hz, 6H), 1.24 (d, J=6.8 Hz, 6H).

1. temperaturecooled in ice bath
2. customThe reaction was evaporated
3. dissolutionthe residue was dissolved in dichloromethane (1 ml)
4. stirringthe mixture was stirred for 18 h
5. customThe layers were separated
6. extractionthe aqueous layer was extracted three times with ethyl acetate
7. washThe combined organic layers were washed with sodium chloride solution
8. dry with materialdried over sodium sulfate
9. customevaporated
10. customThe residue was purified by silica gel chromatography (methanol/dichloromethane)
11. customThe product thus isolated
12. customEvaporation of the solvent
13. customprovided a solid which
14. customwas dried under high vacuum