2,2-Dimethyl-1,3-dioxane-4,6-dione → 7,8-Dihydroxy-3-carboxy-coumarin
Reaktionsgleichung
[OH:1][C:2]1[C:9]([OH:10])=[C:8]([OH:11])[CH:7]=[CH:6][C:3]=1[CH:4]=O.CC1(C)O[C:18](=[O:19])[CH2:17][C:15](=[O:16])[O:14]1>O>[OH:11][C:8]1[C:9]([OH:10])=[C:2]2[C:3]([CH:4]=[C:17]([C:15]([OH:16])=[O:14])[C:18](=[O:19])[O:1]2)=[CH:6][CH:7]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Reaktionsbedingungen
- Temperatur
- 75 °C
Versuchsvorschrift
2,3,4-trihydroxybenzaldehyde (106.7 mg, 0.69 mmol) and Meldrum's acid (100 mg, 0.69 mmol) were combined in H2O (1 mL). The solution was stirred at 75° C. for 2 h. After cooling to room temperature, the precipitate was filtered and dried at suction to give 114.1 mg of 7,8-dihydroxy-3-carboxy-coumarin in a 74% yield.