[NH2:1][C:2]1[CH:10]=[C:9]([N+:11]([O-:13])=[O:12])[C:8]([O:14][CH3:15])=[CH:7][C:3]=1[C:4]([OH:6])=[O:5].[C:16](Cl)(Cl)=[O:17]>C(Cl)(Cl)Cl.O1CCCC1>[CH3:15][O:14][C:8]1[C:9]([N+:11]([O-:13])=[O:12])=[CH:10][C:2]2[NH:1][C:16](=[O:17])[O:5][C:4](=[O:6])[C:3]=2[CH:7]=12.0 g (9.4 mmol) of 2-amino-5-methoxy-4-nitrobenzoic acid were dissolved in 20 ml of chloroform and 10 ml of tetrahydrofuran, and 20 ml of 20% strength phosgene solution (1.8 M in toluene) were added. After 3 hours under reflux, a further 10 ml of phosgene solution were added at 60° C., and the mixture was stirred at 60° C. for a further 12 hours. The phosgene was distilled off and the residue was concentrated in vacuo after addition of toluene several times. 2.2 g (100%) of the desired product were obtained.
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