反应详情

A mixture of 2-butyl-1,2,4-thiadiazolo[4,5-a]benzimidazole-3(2H)-one (2.0 g, 8.1 mmol) and dibromo(2-pyridyl)acetonitrile (4.91 g, 17.8 mmol) in 50 mL of dichloromethane was heated to reflux for 16 h. After cooling to room temperature, the precipitate was filtered, washed with dichloromethane and dried to give 2.76 g (80%) of the title compound as a light-brown solid: mp 195° C. (dec); 1H NMR (CDCl3)δ 8.25 (m, 2H), 7.96 (dt, 1H), 7.76 (d, 1H), 7.32 (m, 2H), 6.95 (t, 1H), 6.92 (s, 1H) ppm; 13C NMR (CDCl3)δ 166.08, 157.95, 150.34, 148.28, 147.71, 138.31, 128.76, 124.79, 124.58, 122.94, 121.68, 119.49, 113.97, 54.37 ppm; HRMS calcd for C14H8Br2N4S: 421.8836, found: 421.8850.

1. temperaturewas heated
2. temperatureto reflux for 16 h
3. filtrationthe precipitate was filtered
4. washwashed with dichloromethane
5. customdried