2,2-Dimethyl-1,3-dioxane-4,6-dione → 6-methoxy-2-oxo-2H-chromene-3-carboxylic acid

HRID 240028

Reaktionsgleichung

Reaktionsgleichung von HRID 240028
[CH3:1][O:2][C:3]1[CH:10]=[C:7]([CH:8]=O)[C:6]([OH:11])=[CH:5][CH:4]=1.CC1(C)O[C:18](=[O:19])[CH2:17][C:15](=[O:16])[O:14]1>O>[CH3:1][O:2][C:3]1[CH:10]=[C:7]2[C:6](=[CH:5][CH:4]=1)[O:11][C:18](=[O:19])[C:17]([C:15]([OH:16])=[O:14])=[CH:8]2

Komponenten

4

Edukt 2

HCID 162492,2-Dimethyl-1,3-dioxane-4,6-dioneHCID 956952-Hydroxy-5-methoxybenzaldehyde

Produkt 1

HCID 7117176-methoxy-2-oxo-2H-chromene-3-carboxylic acidAusbeute 79 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 962WaterLösungsmittel

Reaktionsbedingungen

Temperatur
75 °C

Versuchsvorschrift

5-methoxy-salicylaldehyde (211.1 mg, 1.39 mmol) and Meldrum's acid (200 mg, 1.39 mmol) were combined in H2O (2 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 241.1 mg of 6-methoxy-3-carboxy-coumarin in a 79% yield.

Aufarbeitung

  1. temperatureAfter cooling to room temperature
  2. filtrationthe precipitate was filtered
  3. customdried at suction

Quellen und Nachweise

ORD-Eintrag
ord-1bfe4d034d2041869f9065faca74f02e
Quelldatensatz
uspto-grants-2014_02
Patentnummer
US08642788B2

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