反应详情

In a 25 mL round-bottomed flask, 2-(6-chloro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (cis-4-aminocyclohexyl)amide (85 mg, 0.153 mmol) was dissolved in dichloromethane (8 mL). Trifluoroacetic acid (2.5 mL, 32.4 mmol) was added and the orange reaction mixture was stirred at room temperature for 3 h. The reaction mixture was then concentrated under reduced pressure. The resultant crude solid was dissolved in dichloromethane (8 mL) and ethylenediamine (1 mL, 14.8 mmol) was added. The reaction mixture was stirred at room temperature for 2 h. The reaction mixture was concentrated and the residue was precipitated with water. The suspension was stirred for 1 h and the crude solid collected by filtration. The crude solid was sequentially washed with water, dichloromethane, ethyl acetate, and hexanes to afford 61 mg (93%) of 2-(6-chloro-1-methyl-1H-indazol-3-yl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (cis-4-aminocyclohexyl)-amide as a light yellow solid. MS: [M+H]+=424; 1H NMR (300 MHz, DMSO-d6) δ: 9.05 (d, J=1.0 Hz, 1H), 8.47 (d, J=9.1 Hz, 1H), 8.42 (d, J=1.0 Hz, 1H), 8.08 (d, J=7.1 Hz, 1H), 7.98 (s, 1H), 7.40 (d, J=9.1 Hz, 1H), 4.17 (d, J=1.0 Hz, 3H), 4.00 (br. s., 1H), 2.96 (br. s., 1H), 1.87-2.02 (m, 2H), 1.66-1.76 (m, 2H), 1.55-1.66 (m, 2H), 1.44-1.54 (m, 2H).

1. concentrationThe reaction mixture was then concentrated under reduced pressure
2. dissolutionThe resultant crude solid was dissolved in dichloromethane (8 mL)
3. stirringThe reaction mixture was stirred at room temperature for 2 h
4. concentrationThe reaction mixture was concentrated
5. customthe residue was precipitated with water
6. stirringThe suspension was stirred for 1 h
7. filtrationthe crude solid collected by filtration
8. washThe crude solid was sequentially washed with water, dichloromethane, ethyl acetate, and hexanes