2,5-Dibromopyridine → HCID 86638499, Verbindung

To a solution of 2,5-dibromopyridine (16 g, 67 mmol) in toluene (150 mL) was added 2.5 N solution of n-BuLi (27 mL, 67 mmol) dropwise at −78° C. The resulting solution was stirred at −78° C. for 1 hour before the addition of 2,2-difluoroacetate (10 g, 80 mmol). After stirred at ambient temperature overnight, the reaction solution was diluted with saturated aqueous NH4Cl solution (80 mL) at 0° C., and then extracted with ethyl acetate (2×100 mL). All the organic solution was dried over sodium sulfate, filtered and concentrated in vacuo. The crude residue was purified by flash column chromatography with 5-10% ethyl acetate in hexane to afford the title compound as a white solid. 1H NMR (300 MHz, CDCl3) δ 8.82 (s, 1H), 8.08 (d, J=6.0 Hz, 1H), 8.03 (d, J=6.0 Hz, 1H), 7.05 (t, J=54.4 Hz, 1H).

1. extractionextracted with ethyl acetate (2×100 mL)
2. dry with materialAll the organic solution was dried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customThe crude residue was purified by flash column chromatography with 5-10% ethyl acetate in hexane

ORD-Eintrag

ord-8f5cab0cca0343b8994b7ae7ff9bff84

Quelldatensatz

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09394282B2