N-bromobutanimide → HCID 18446605, compound

Participants

Reaction Steps

To a solution of 7-chloro-2-(2-furyl)pyrazolo[1,5-a]pyridine-3-carbaldehyde (2.0 g, 8.06 mmol) in dichloromethane was added N-bromosuccinimide (2.01 g, 11.28 mmol). After stirring at room temperature for 2 hours, the reaction mixture was diluted with dichloromethane, washed with water and brine and dried over magnesium sulfate. Filtration and concentration followed by recrystallization with ethyl acetate gave 2-(5-bromo-2-furyl)-7-chloropyrazolo[1,5-a]pyridine-3-carbaldehyde (2.1 g, 80%) as a white solid. 1H NMR (CDCl3): δ 10.50 (s, 1H), 8.37 (dd, 1H), 7.47 (t, 1H), 7.20–7.18 (m, 2H), 6.54 (d, 1H). MS m/z 325 (M+1).

Provenance & Evidence