反应详情

To a solution of 6.25 g of 2-methyl-5-cyanothio-11H-1,2,4-triazolo[2,3-c][1,3]benzodiazepine in 7.3 ml of hexamethylphosphoramide is added dropwise, at 0°, 4.94 g of N-methylpiperazine over a period of 5 minutes. The mixture is stirred at room temperature for 4 hours, poured into water and extracted with ethyl acetate. The organic extracts are washed with water, dried over magnesium sulfate and evaporated to dryness to give 2-methyl-5-(4-methyl-1-piperazinyl)-11H-1,2,4-triazolo[2,3-c][1,3]benzodiazepine, m.p. 185°-187°. This material is treated with an equivalent amount of maleic acid to give 2-methyl-5-(4-methyl-1-piperazinyl)-11H-1,2,4-triazolo[2,3-c][1,3]benzodiazepine monomaleate of example 1.

1. extractionextracted with ethyl acetate
2. washThe organic extracts are washed with water
3. dry with materialdried over magnesium sulfate
4. customevaporated to dryness