Cl[C:2]([O:4][C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1)=[O:3].[N+:11]([C:14]1[CH:19]=[CH:18][C:17]([NH2:20])=[CH:16][CH:15]=1)([O-:13])=[O:12].O>CC(N(C)C)=O>[N+:11]([C:14]1[CH:19]=[CH:18][C:17]([NH:20][C:2](=[O:3])[O:4][C:5]2[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=2)=[CH:16][CH:15]=1)([O-:13])=[O:12]Phenyl chloroformate (1.08 mol) was added dropwise at a temperature <20° C. to a stirring solution of 4-nitrobenzenamine (1.02 mol) in DMA (500 ml) on ice and the mixture was stirred overnight. The mixture was poured into water (1000 ml), stirred till a homogenously suspension and filtered off, yielding phenyl (4-nitrophenyl)carbamate (intermediate 1).
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