C[Al](C)C.[I:5][C:6]1[C:7]([S:12]([NH2:15])(=[O:14])=[O:13])=[N:8][CH:9]=[CH:10][CH:11]=1.[CH3:16][O:17][C:18]1[N:23]=[C:22]([O:24][CH3:25])[N:21]=[C:20]([NH:26][C:27](=O)[O:28]C)[N:19]=1>C1(C)C=CC=CC=1.ClCCl>[CH3:25][O:24][C:22]1[N:23]=[C:18]([O:17][CH3:16])[N:19]=[C:20]([NH:26][C:27](=[O:28])[NH:15][S:12]([C:7]2[C:6]([I:5])=[CH:11][CH:10]=[CH:9][N:8]=2)(=[O:13])=[O:14])[N:21]=19.0 ml (18 mmol) of a 2M solution of trimethylaluminum in toluene are added dropwise at room temperature to 4.3 g (15 mmol) of 3-iodo-2-pyridinesulfonamide in 150 ml of dichloromethane. After evolution of gas has ceased, 3.85 [lacuna] (18 mmol) of methyl 4,6-dimethoxy-1,3,5-triazin-2-yl-carbamate in 20 ml of dichloromethane is added dropwise and the resulting solution is refluxed for 24 hours. The mixture is cooled and poured into 150 ml of ice-cold 1N hydrochloric acid. The organic phase is separated off and the aqueous phase is extracted 2× using dichloromethane. The organic phase is dried and evaporated. After triturating the crude product with diethyl ether, 3.1 g (44% of theory) of 3-(4,6-dimethoxy-1,3,5-triazin-2-yl)-1-(3-iodo-2-pyridylsulfonyl)urea of melting point 155° C. (dec.) are obtained.
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