反应详情

温度

0 °C

A suspension of NaH (2.7 g, 68 mmol, 60% in mineral oil) in DMF (20 mL) at 0° C. is treated with 3-ethyl-5-fluoro-1H-pyrrolo[2,3-b]pyridine (745 mg, 4.5 mmol) and stirred at 0° C. for 1 h. The mixture is treated with HOSA (2.5 g, 22.5 mmol) portion wise and warmed to rt over 2 h. The mixture is then poured over ice, filtered through a pad of Celite, and extracted with EtOAc (3×50 mL). The combined organic layer is dried (Na2SO4), filtered and concentrated in vacuo. The residue is purified by silica gel chromatography eluting with 30% -50% EtOAc in heptane to afford 3-ethyl-5-fluoropyrrolo[2,3-b]pyridin-1-ylamine (685 mg, 84%). MS: 180 (M+H); 1H NMR (300 MHz, CDCl3): δ 8.16 (s, 1H), 7.56 (m, 1H), 7.14 (s, 1H), 4.93 (s, NH2, 2H), 2.697 (q, 2H), 1.28 (t, 3H).

1. additionThe mixture is treated with HOSA (2.5 g, 22.5 mmol) portion wise
2. temperaturewarmed to rt over 2 h
3. additionThe mixture is then poured over ice
4. filtrationfiltered through a pad of Celite
5. extractionextracted with EtOAc (3×50 mL)
6. dry with materialThe combined organic layer is dried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue is purified by silica gel chromatography
10. washeluting with 30% -50% EtOAc in heptane