[CH3:1][O:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][C:4]=1[NH:9][C:10]([NH:12][C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][C:14]=1[O:19][CH3:20])=[O:11].[OH-].[Na+].Cl[O-].[Na+].O>[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.C(Cl)Cl.CO>[CH3:20][O:19][C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][C:13]=1[N:12]1[C:5]2[CH:6]=[CH:7][CH:8]=[C:3]([O:2][CH3:1])[C:4]=2[NH:9][C:10]1=[O:11]
A mixture of N,N'-di-(2-methoxyphenyl)-urea (6.81 g, 25 mmol) and tetra-n-butyl-ammoniumbromide (0.4 g, 1.3 mmol) in methylene chloride/methanol (1:1 , 200 ml) was at room temperature under vigorous stirring added a solution of sodium hydroxide (2 g in 10 ml water) followed by a solution of sodiumhypochlorite(55 ml, Aldrich). The mixture was stirred for 4 hours and 30 ml water was added The organic phase was washed with 10 ml 1M hydrogen chloride sol., dried and concentrated in vacuo. Upon trituration with diethyl ether dark grey crystals separated The crude product was recrystallized twice, first from ethanol and then from ethyl acetate yielding the title compound as white crystals, M.p. 246°-247° C.
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