[NH2:1][N:2]1[CH2:7][CH2:6][N:5]([CH3:8])[CH2:4][CH2:3]1.[N+:9]([C:12]1[CH:13]=[C:14]([C:22](Cl)=[O:23])[C:15]2[O:20][CH2:19][CH2:18][O:17][C:16]=2[CH:21]=1)([O-:11])=[O:10].O>C(C(C)=O)C>[CH3:8][N:5]1[CH2:6][CH2:7][N:2]([NH:1][C:22]([C:14]2[C:15]3[O:20][CH2:19][CH2:18][O:17][C:16]=3[CH:21]=[C:12]([N+:9]([O-:11])=[O:10])[CH:13]=2)=[O:23])[CH2:3][CH2:4]133 g of 1-amino-4-methylpiperazine were dissolved in 630 ml of methyl ethyl ketone. The mixture was cooled to 10° C. and 61 g of 7-nitro-1,4-benzodioxane-5-carbonyl chloride were introduced by portions. The mixture was stirred for two hours and then the solid was filtered off and washed with 150 ml of methyl ethyl ketone. The obtained product was purified by transformation into the base (M.P.: 212° C.) and recystallized by treatment with hydrochloric ethanol. 45 g of N-(4-methyl-1-piperazinyl)-7-nitro-1,4-benzodioxane-5-carboxamide were obtained (M.P.: 210° C. with one mole of water). The structure was confirmed by nuclear magnetic resonance and infrared analyses.
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