反应详情

In a 10 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 ((S)-2-hydroxy-1-methyl-ethyl)-amide (44 mg, 0.085 mmol) was dissolved in THF (0.85 ml) to give a colorless solution. The reaction was cooled in an ice bath. Crushed KOH (64 mg, 1.14 mmol), catalytic 18-crown-6, and iodomethane (9 μl, 0.147 mmol) were added successively to the cooled solution. The reaction mixture was stirred at 0° C. for 1 h after which the ice bath was removed. The reaction mixture was stirred at room temperature for 2 h then diluted with dichloromethane (10 mL) and washed with aqueous ammonium chloride (10 mL), water (10 mL), and saturated sodium bicarbonate (10 mL). The organic layer was dried over Na2SO4 and concentrated. The crude material was purified by chromatography over SiO2 with EtOAc/heptane (gradient: 0%-100% EtOAc) to afford 22 mg (49%) of 2-(6-chloro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((S)-2-methoxy-1-methyl-ethyl)-amide as a white solid. MS: [M+Na]+=551.

1. customto give a colorless solution
2. temperatureThe reaction was cooled in an ice bath
3. customwas removed
4. additionthen diluted with dichloromethane (10 mL)
5. washwashed with aqueous ammonium chloride (10 mL), water (10 mL), and saturated sodium bicarbonate (10 mL)
6. dry with materialThe organic layer was dried over Na2SO4
7. concentrationconcentrated
8. customThe crude material was purified by chromatography over SiO2 with EtOAc/heptane (gradient: 0%-100% EtOAc)