反应详情

A suspension of 40 g 5-bromo-2-hydrazinylpyridine (212 mmol) and 38 g 1,1′-Carbonyldiimidazole (234 mmol) in 500 mL acetonitrile was refluxed for 2 h. The reaction was then cooled to room temperature overnight. The precipitate was collect by filtration. 6-Bromo-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one as a light brown solid was collected. m/z (ESI)=213.9 [M+H]+. 1H NMR (δ, d6-DMSO, 400 MHz) 12.59 (s, 1H), 8.04 (dd, 1H), 7.21 (m, 2H).

1. temperaturewas refluxed for 2 h
2. filtrationThe precipitate was collect by filtration
3. custom6-Bromo-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one as a light brown solid was collected