反应详情

In a 10 mL round-bottomed flask, 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((1R,2R)-2-hydroxy-1-hydroxymethyl-propyl)-amide (81 mg, 0.152 mmol) was dissolved in THF (1.5 ml) to give a colorless solution. The reaction was cooled in an ice bath and crushed KOH (86 mg, 1.52 mmol), 18-crown-6 (40 mg, 0.152 mmol), and iodomethane (10 μl, 0.152 mmol) were added successively. 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%-60% EtOAc) to afford 30 mg (36%) of 2-(6-fluoro-1-methyl-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid ((1R,2R)-2-hydroxy-1-methoxymethyl-propyl)-amide as an off-white solid. 1H NMR (300 MHz, DMSO-d6) δ: 9.22 (s, 1H), 8.78 (dd, J=8.9, 5.5 Hz, 1H), 8.66 (s, 1H), 8.14 (d, J=9.4 Hz, 1H), 7.67 (dd, J=9.8, 2.3 Hz, 1H), 7.17 (td, J=9.2, 2.1 Hz, 1H), 5.75 (s, 2H), 5.21 (d, J=4.2 Hz, 1H), 4.22-4.34 (m, 1H), 4.17 (s, 3H), 3.97-4.12 (m, 1H), 3.61 (app t, J=8.2 Hz, 3H), 3.52 (dd, J=9.8, 6.4 Hz, 1H), 3.28 (s, 3H), 1.14 (d, J=6.4 Hz, 3H), 0.87 (t, J=7.9 Hz, 2H), −0.07 (s, 9H).

1. customto give a colorless solution
2. temperatureThe reaction was cooled in an ice bath
3. additionwere added successively
4. customwas removed
5. additionthen diluted with dichloromethane (10 mL)
6. washwashed with aqueous ammonium chloride (10 mL), water (10 mL), and saturated sodium bicarbonate (10 mL)
7. dry with materialThe organic layer was dried over Na2SO4
8. concentrationconcentrated
9. customThe crude material was purified by chromatography over SiO2 with EtOAc/heptane (gradient: 0%-60% EtOAc)