反应详情

To a stirred suspension of 0.5 g (3.4 mmol) 2-amino-4,6-dimethyl-3-pyridinecarbonitrile [Archiv. Pharm., 288, 174 (1955)] in 20 ml of acetonitrile was added 1.3 g (5.7 mmol) o-nitrobenzenesulfonyl isocyanate. The mixture was then heated to reflux (80°) for four hours followed by stirring at ambient temperature overnight. A crystalline product was collected, 0.5 g, m.p. 174°-176° dec. An infrared spectrum (nujol mull) exhibited absorptions at 1700, 1720 and 2240 cm-1 ; and a proton magnetic resonance spectrum (90 MHz NMR) exhibited absorptions at 2.5 (s, 3H), 2.6 (s, 3H), 7.05 (s, 1H), 7.7 (s br, NH), 7.8 (m, 3H), 8.4 (m, 1H), 9.7 (s br, NH) ppm indicating the title compound.

1. temperatureThe mixture was then heated
2. temperatureto reflux (80°) for four hours
3. customA crystalline product was collected