Selenium Dioxide → 3-Bromopyridine-2-carbaldehyde

To a solution of 3-bromo-2-picoline (prepared as described by Guthikonda, R. N.; Cama, L. D.; Quesada, M.; Woods, M. F.; Salzmann, T. N.; Christensen, B. G. J. Med. Chem. 1987, 30, 871–880) (249 mg, 1.45 mmol) in dioxane (2 mL) was added selenium(IV) oxide (212 mg, 1.91 mmol) and the mixture stirred at reflux overnight. The reaction mixture was concentrated under reduced pressure and purified by column chromatography on silica gel (Hexanes/ether, 3:1) to afford the title compound (78 mg, 29%) as a pale yellow solid. 1H NMR (CDCl3): δ 7.38 (dd, 1H, J=9, 6 Hz), 8.05 (d, 1H, J=9 Hz), 8.76 (d, 1H, J=3 Hz), 10.25 (s, 1H).

1. temperatureat reflux overnight
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. custompurified by column chromatography on silica gel (Hexanes/ether, 3:1)

ORD record

ord-493790f571d847c0aaa1ed77fe3bc67c

Source dataset

uspto-grants-2006_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07084155B2