[Na].O[CH:3]=[C:4]1[CH2:8][CH2:7][O:6][C:5]1=[O:9].[Cl:10][C:11]1[CH:18]=[CH:17][CH:16]=[CH:15][C:12]=1[CH2:13][NH2:14]>>[Cl:10][C:11]1[CH:18]=[CH:17][CH:16]=[CH:15][C:12]=1[CH2:13][NH:14][CH:3]=[C:4]1[CH2:8][CH2:7][O:6][C:5]1=[O:9]Using 3-hydroxymethylenedihydrofuran-2-one sodium salt (10 mmol) and 2-chlorobenzylamine (11 mmol) and proceeding according to the abovementioned method A2, 3-(2-chlorobenzylamino)methylenedihydrofuran-2-one (1.54 g, efficiency: 75%) is produced in the form of a white powder.
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