[CH3:1][NH:2][C:3]1[CH2:7][O:6][C:5](=[O:8])[CH:4]=1.[OH-].[Na+].[Cl:11][C:12]1[CH:17]=[CH:16][C:15]([CH2:18]Cl)=[CH:14][N:13]=1>C(COC)OC>[Cl:11][C:12]1[N:13]=[CH:14][C:15]([CH2:18][N:2]([CH3:1])[C:3]2[CH2:7][O:6][C:5](=[O:8])[CH:4]=2)=[CH:16][CH:17]=130 g of 4-(methylamino)furan-2(5H)-one (Example 11) are initially charged in 450 ml of dimethoxyethane at room temperature. Subsequently, 12.6 g of sodium hydroxide are added and, at 40° C., 225 g of a 20% solution of 2-chloro-5-(chloromethyl)pyridine in dimethoxyethane are metered in. The mixture is stirred at 50° C. for a further 6 h. The solvent is substantially removed under reduced pressure and the residue is admixed with 300 ml of water. The solids are filtered off, washed with 150 ml of water and dried under reduced pressure. 58.7 g of 4-([[6-chloropyridin-3-yl]methyl](methy)amino)furan-2(5H)-one are obtained with a purity of 94% (this corresponds to 87% yield).
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