Ethyl benzoylacetate → 3-Benzoyl-5,7-dimethoxy-2H-1-benzopyran-2-one
Reaktionsgleichung
[CH3:1][O:2][C:3]1[CH:4]=[C:5](O)C(=[C:9]([O:11][CH3:12])[CH:10]=1)C=O.[C:14]([CH2:22][C:23]([O:25][CH2:26][CH3:27])=[O:24])(=[O:21])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1>N1CCCCC1.C(#N)C>[C:14]([C:22]1[C:23](=[O:24])[O:25][C:26]2[C:4]([CH:5]=1)=[C:3]([O:2][CH3:1])[CH:10]=[C:9]([O:11][CH3:12])[CH:27]=2)(=[O:21])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1Komponenten
5
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 2
Versuchsvorschrift
A mixture of 18.2 g 4,6-dimethoxysalicylaldehyde, 20.0 g ethyl benzoylacetate, 20 ml acetonitrile and 30 drops piperidine was heated gently on a hot plate for 45 minutes. After cooling the product was collected and recrystallized twice from acetonitrile and once from benzene containing a small amount of acetonitrile. m.p. 178° C.-179° C.