Dimethyl Succinate → 3-Carbomethoxy-4-(3-methoxyphenyl)-3-butenoic acid

HRID 129692

Reaktionsgleichung

Reaktionsgleichung von HRID 129692
CC(C)([O-])C.[K+].[CH3:7][O:8][C:9]1[CH:10]=[C:11]([CH:14]=[CH:15][CH:16]=1)[CH:12]=O.[C:17]([O:25]C)(=[O:24])[CH2:18][CH2:19][C:20]([O:22][CH3:23])=[O:21]>C(O)(C)(C)C>[C:20]([C:19](=[CH:12][C:11]1[CH:14]=[CH:15][CH:16]=[C:9]([O:8][CH3:7])[CH:10]=1)[CH2:18][C:17]([OH:25])=[O:24])([O:22][CH3:23])=[O:21]

Komponenten

5

Edukt 3

HCID 7820Dimethyl SuccinateHCID 115693-MethoxybenzaldehydeHCID 23665647Potassium tert-butoxide

Produkt 1

HCID 5896073-Carbomethoxy-4-(3-methoxyphenyl)-3-butenoic acid

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6386tert-ButanolLösungsmittel2×

Versuchsvorschrift

To a refluxing suspension of 15.71 g (140 mmol, 1.4 eq) of potassium t-butoxide in 50 ml of t-butylalcohol is dropped in a mixture of 12.17 (100 mmol) of 3-methoxybenzaldehyde and 15.70 ml (120 mmol, 1.2 eq) of dimethyl succinate dissolved in 20 ml of t-butylalcohol. The mixture is refluxed for 3 hours, concentrated in vacuo, acidified to pH ~1 using 1N HCl, and extracted with ethylacetate. The organics are dried (MgSO4) and concentrated in vacuo to give 3-carbomethoxy-4-(3-methoxyphenyl)-3-butenoic acid in the form of a yellow oil which is used directly in the next step.

Aufarbeitung

  1. temperatureThe mixture is refluxed for 3 hours
  2. concentrationconcentrated in vacuo
  3. extractionextracted with ethylacetate
  4. dry with materialThe organics are dried (MgSO4)
  5. concentrationconcentrated in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-9dbac76f957c46e69eb4d7b1f14b508a
Quelldatensatz
uspto-grants-1995_11
Patentnummer
US05468898

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