Benzoyl Peroxide → 4-Bromomethyl-2-fluoropyridine

Temperatur

90 °C

To a solution of 2-fluoro-4-methylpyridine (0.510 g, 4.59 mmol) in 20 mL of carbon tetrachloride was added N-bromosuccinimide (0.899 g, 5.05 mmol) and benzoyl peroxide (0.148 g, 0.459 mmol). The mixture was heated to 90° C. for 1 h, and then additional benzoyl peroxide (0.074 g, 0.23 mmol) was added. After 20 h, the reaction was diluted with dichloromethane, washed 3× with water, dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was purified via silica gel chromatography, eluting with 0-10% ethyl acetate in hexanes to provide the 4-(bromomethyl)-2-fluoropyridine that gave proton NMR spectra consistent with theory and a mass ion (ES+) of 191.9 (81Br) for [M+H]+.

1. washwashed 3× with water
2. dry with materialdried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated in vacuo
5. customThe residue was purified via silica gel chromatography
6. washeluting with 0-10% ethyl acetate in hexanes

ORD-Eintrag

ord-26fd88478f0a49bca53fd2c9665016b2

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08846702B2