Acetic Anhydride → HCID 13375747, Verbindung
Reaktionsgleichung
[CH3:1][O:2][C:3]([C:5]1[CH:22]=[CH:21][C:8]([C:9]2[O:10][C:11]3[C:16]([C:17](=[O:19])[CH:18]=2)=[CH:15][CH:14]=[C:13]([NH2:20])[CH:12]=3)=[CH:7][CH:6]=1)=[O:4].[C:23](OC(=O)C)(=[O:25])[CH3:24]>N1C=CC=CC=1>[C:23]([NH:20][C:13]1[CH:12]=[C:11]2[C:16]([C:17](=[O:19])[CH:18]=[C:9]([C:8]3[CH:21]=[CH:22][C:5]([C:3]([O:2][CH3:1])=[O:4])=[CH:6][CH:7]=3)[O:10]2)=[CH:15][CH:14]=1)(=[O:25])[CH3:24]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
The mixture consisting of 2 g of 7-amino-4'-flavonecarboxylic acid methyl ester thus prepared, 30 cc of pyridine, 15 cc of acetic anhydride is heated at 40° for 2 hours with stirring. Completion of the reaction is verified by thin-layer chromatography (benzene (90)-dioxane (25)-acetic acid (4) elution solvent). The reaction mixture is poured in 500 cc of ice water. The solid that is formed is filtered, washed with water and dried by formation of an azeotropic system with benzene. Yield 56%.