1-Methylpiperazine → 5-[(4-Methyl-1-piperazinyl)-carbonyl]-6,7-dibromo-8-nitro-1,4-benzodioxane

Beteiligte Stoffe

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Reaktionsschritte

400 ml of methylethylacetone and 11 g of methylpiperazine were introduced into a balloon flask provided with an agitator and a thermometer. The mixture was cooled to 10° C. and then 41 g of 6,7-dibromo-8-nitro-1,4-benzodioxane-5-carbonyl chloride were added in portions with the temperature being maintained below 20° C. After agitation of the mixture, the crystals were dried off, washed with methylethylcetone and dried and then dissolved in water and reprecipitated by addition of 50 ml of 20% ammonia. The crystals were dried off, washed with water and dried. 33 g of 5-[(4-methyl-1-piperazinyl)-carbonyl]-6,7-dibromo-8-nitro-1,4-benzodioxane were obtained (M.P: 164° C.; yield: 69.6%).

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