Tetrahydrofuran → HCID 59263148, Verbindung

HRID 425208

Reaktionsgleichung

Reaktionsgleichung von HRID 425208
[CH3:1][O:2][C:3](=[O:15])[C:4]1[CH:9]=[C:8](Br)[C:7]([O:11][CH3:12])=[CH:6][C:5]=1[O:13][CH3:14].C([O-])([O-])=O.[Cs+].[Cs+].[CH2:22]1[CH2:26]OC[CH2:23]1>O.CCOC(C)=O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:1][O:2][C:3](=[O:15])[C:4]1[CH:9]=[C:8]([C:22]([CH3:26])=[CH2:23])[C:7]([O:11][CH3:12])=[CH:6][C:5]=1[O:13][CH3:14]

Komponenten

7

Edukt 3

HCID 8028TetrahydrofuranHCID 10796Cesium carbonateHCID 3859236Methyl 5-bromo-2,4-dimethoxybenzoate

Produkt 1

HCID 59263148HCID 59263148, Verbindung

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 178418397HCID 178418397, VerbindungKatalysatorHCID 962WaterLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

To potassium isopropylidene trifluoroborate (4.87 g, 32.7 mmol) and 5-bromo-2,4-dimethoxybenzoic acid methyl ester (7.5 g, 27.3 mmol) in THF (195 ml) was added Cs2CO3 (26.6 g, 81.8 mmol) in water (39 ml). The reaction was degassed and Pd(PPh3)4 (1.58 g, 1.36 mmol) added. The reaction was heated at reflux for three days then quenched by adding water and extracted with EtOAc (×2). The combined organic layers were washed with brine, dried (MgSO4), filtered and evaporated to leave an orange solid. The product was taken up in EtOAc again and the precipitate filtered. The filtrate was evaporated to dryness to yield 5-isopropenyl-2,4-dimethoxy-benzoic acid methyl ester (6.2 g). 1H NMR (Me-d3-OD) 7.68 (1H, s), 6.66 (1H, s), 5.10-5.08 (1H, m), 5.02-5.00 (1H, m), 3.93 (3H, s), 3.92 (3H, s), 3.84 (3H, s), 2.08-2.06 (3H, m). MS: [M+H]+ 237.

Aufarbeitung

  1. customThe reaction was degassed
  2. temperatureThe reaction was heated
  3. temperatureat reflux for three days
  4. customthen quenched
  5. additionby adding water
  6. extractionextracted with EtOAc (×2)
  7. washThe combined organic layers were washed with brine
  8. dry with materialdried (MgSO4)
  9. filtrationfiltered
  10. customevaporated
  11. customto leave an orange solid
  12. filtrationthe precipitate filtered
  13. customThe filtrate was evaporated to dryness

Quellen und Nachweise

ORD-Eintrag
ord-4a02844dbd9345b18342311ccba8b787
Quelldatensatz
uspto-grants-2012_01
Patentnummer
US08106057B2

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