反应详情

温度

21 °C

A mixture of 0.6 g (3.9 mmol) of 4-chloromethylimidazole and of an equimolar equivalent of thiourea (0.3 g) in 10 ml of ethanol is brought to reflux for 30 min. 5 ml of ethanol, 20 ml of water and 1.2 molar equivalents of 2-chloro-5-nitropyridine (0.74 g) in 5 ml of hot ethanol are added to this mixture. The light solution is cooled to 0°-10° C. in an ice bath and a solution of 0.49 g of sodium hydroxide in 10 ml of water is added dropwise under nitrogen at 0°-10° C. and then the mixture is stirred for a further 3 h at 21° C. The precipitate is collected, washed with water and chromatographed through silica gel with a mixture of chloroform and methanol (1°-20%) to give the title compound, M.p.: 155°-156° C.

1. temperatureto reflux for 30 min
2. temperatureThe light solution is cooled to 0°-10° C. in an ice bath
3. customThe precipitate is collected
4. washwashed with water
5. customchromatographed through silica gel with a mixture of chloroform and methanol (1°-20%)