反应详情

To a suspension of 0.91 g of sodium hydride in 27 ml of tetrahydrofuran is added dropwise a solution of 8.74 g of 5-methyl-3-(o-isothiocyanatobenzyl)-1,2,4-triazole in 60 ml of tetrahydrofuran over a period of 20 minutes. The mixture is stirred at room temperature for 2 hours. To the resulting suspension a solution of 4.02 g of cyanogen bromide in 35 ml of tetrahydrofuran is added dropwise at 0° over a period of 15 minutes. The mixture is stirred at 0° for 1.5 hours, poured into water and extracted three times with ethyl acetate. The organic extracts are dried over magnesium sulfate, decolorized with charcoal and evaporated to give 2-methyl-5-cyanothio-11H-1,2,4-triazolo[2,3-c][1,3]benzodiazepine; IR 2150 cm-1.

1. stirringThe mixture is stirred at 0° for 1.5 hours
2. extractionextracted three times with ethyl acetate
3. dry with materialThe organic extracts are dried over magnesium sulfate
4. customevaporated