反应详情

To a stirred solution of (R)-2-((1-(benzyloxy)propan-2-yl)oxy)-3-bromopyridine (2.4 g, 7.5 mmol) in dry DCM (10 mL) was added BBr3 (7.5 mL, 22 mmol, 3 M in DCM) at −78 Celsius in a drop-wise manner and stirring continued for 3 h. The reaction mixture was warmed to rt and the pH adjusted to −7-8 with sat. NaHCO3 (30 mL). The mixture was extracted with DCM (2×10 mL), and the combined extracts dried over Na2SO4, filtered, concentrated to dryness. The crude product was purified by FCC to provide the title compound. 1H NMR (400 MHz, CDCl3) δ 8.05-7.99 (m, 1H), 7.84-7.75 (m, 1H), 6.83-6.71 (m, 1H), 5.25-5.12 (m, 1H), 3.78 (d, J=5.1, 2H), 3.29 (s, 1H), 1.37 (d, J=6.4, 3H).

1. extractionThe mixture was extracted with DCM (2×10 mL)
2. dry with materialthe combined extracts dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated to dryness
5. customThe crude product was purified by FCC