[CH3:1][NH:2][C:3]([CH:5]1[CH2:10][NH:9][CH2:8][CH2:7][NH:6]1)=[O:4].Cl[CH2:12][C:13]([NH:15][C:16]1[C:21]([Cl:22])=[CH:20][C:19]([Cl:23])=[CH:18][C:17]=1[Cl:24])=[O:14].C(N(CC)CC)C>COCCO>[CH3:1][NH:2][C:3]([CH:5]1[NH:6][CH2:7][CH2:8][N:9]([CH2:12][C:13]([NH:15][C:16]2[C:17]([Cl:24])=[CH:18][C:19]([Cl:23])=[CH:20][C:21]=2[Cl:22])=[O:14])[CH2:10]1)=[O:4]A mixture of 15.33 parts of N-methyl-2-piperazinecarboxamide, 27.2 parts of 2-chloro-N-(2,4,6-trichlorophenyl)acetamide, 9.8 parts of N,N-diethylethanamine and 300 parts of 2-methoxyethanol was stirred for 3 hours at 60° C. The reaction mixture was evaporated. The residue was taken up in a small amount of water and treated with sodium carbonate. The product was extracted three times with dichloromethane. The combined extracts were dried, filtered and evaporated. The residue was crystallized from acetonitrile. The product was filtered off (the filtrate was set aside) and dried, yielding a first fraction of 9.27 parts (24.4%) of 3-[(methylamino)carbonyl]-N-(2,4,6-trichlorophenyl)-1-piperazineacetamide. The filtrate, which was set aside (see above) was evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and 2-propanol (90:10 by volume) as eluent. The desired fraction was collected and the eluent was evaporated. The residue was crystallized from acetonitrile. The product was filtered off and dried, yielding a second fraction of 5.93 parts (15.6%) of 3-[(methylamino)carbonyl]-N-(2,4,6-trichlorophenyl)-1-piperazineacetamide; mp. 168.9° C.
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