C[O:2][C:3]1[C:12]([O:13]C)=[N:11][C:10]2[C:5](=[CH:6][C:7]([N+:20]([O-:22])=[O:21])=[CH:8][C:9]=2[CH2:15][N:16]2[CH2:18][CH:17]2[CH3:19])[N:4]=1.[BrH:23]>C(O)(=O)C.C(OCC)C>[BrH:23].[O:2]=[C:3]1[C:12](=[O:13])[NH:11][C:10]2[C:5](=[CH:6][C:7]([N+:20]([O-:22])=[O:21])=[CH:8][C:9]=2[CH2:15][N:16]2[CH2:18][CH:17]2[CH3:19])[NH:4]1180 mg (0.59 mmol) of N-(2,3-dimethoxy-7-nitro-quinoxalin-5-ylmethyl)-2-methylaziridine are stirred in a 33% solution of hydrogen bromide in acetic acid for 2 hours at 70° C. The mixture is diluted with diethyl ether and the solid is filtered off and washed with diethyl ether. After drying, the title compound is obtained in the form of a yellow solid. M.p.=241° C. (decomp.).
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