Acetic Acid → HCID 86588958, Verbindung

HRID 353301

Reaktionsgleichung

Reaktionsgleichung von HRID 353301
[CH2:1]([O:8][C:9]1[CH:16]=[CH:15][C:12]([CH:13]=O)=[C:11](C(C)(C)C)[CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:21]([O:23][CH2:24][C:25]([O:27][CH2:28][CH3:29])=[O:26])[CH3:22].[CH3:30][C:31]([CH3:34])([O-])[CH3:32].[K+].C(O)(=O)C.C1(C)C=CC(S(O)(=O)=O)=CC=1>O1CCCC1.C1(C)C=CC=CC=1>[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12](/[CH:13]=[C:24](\[O:23][CH2:21][CH3:22])/[C:25]([O:27][CH2:28][CH3:29])=[O:26])=[CH:15][C:16]=1[C:31]([CH3:34])([CH3:32])[CH3:30])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Komponenten

8

Edukt 5

HCID 176Acetic AcidHCID 6101p-Toluenesulfonic acidHCID 69955Ethyl ethoxyacetateHCID 22708444HCID 22708444, VerbindungHCID 23665647Potassium tert-butoxide

Produkt 1

HCID 86588958HCID 86588958, VerbindungAusbeute 27,9 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 1140TolueneLösungsmittelHCID 8028TetrahydrofuranLösungsmittel2×

Reaktionsbedingungen

Temperatur
-20 °C

Versuchsvorschrift

4-(Benzyloxy)-2-tert-butylbenzaldehyde (0.66 g; 2.44 mmole) and ethyl ethoxyacetate (0.39 g; 2.93 mmole) were dissolved in dry tetrahydrofuran (10 ml) and cooled to −20° C. Potassium tert-butoxide (0.33 g; 2.93 mmole) dissolved in dry tetrahydrofuran (1 ml) was slowly added and the reaction was stirred overnight at −20° C. The reaction was quenched with acetic acid (0.19 g; 3.18 mmole). The crude product was isolated, redissolved in toluene and refluxed over night with p-toluenesulfonic acid (0.05 g; 0.25 mmole) in a Dean-Stark apparatus to separate the water. The solution was cooled, washed with sodium hydrogen carbonate, dried with magnesium sulfate and evaporated. Purification of the crude product with preparative HPLC (Kromasil C8, 7 μm, 50×250 mm) using acetronitrile (50-100%) in ammonium acetate buffer (pH 7) as mobile phase gave 0.26 g (25% yield) of ethyl (2Z)-3-[4-(benzyloxy)-3-tert-butylphenyl]-2-ethoxyacrylate.

Aufarbeitung

  1. additionwas slowly added
  2. customThe crude product was isolated
  3. customto separate the water
  4. temperatureThe solution was cooled
  5. washwashed with sodium hydrogen carbonate
  6. dry with materialdried with magnesium sulfate
  7. customevaporated
  8. customPurification of the crude product with preparative HPLC (Kromasil C8, 7 μm, 50×250 mm)

Quellen und Nachweise

ORD-Eintrag
ord-50b133f9dc724f7889b6d54900a516a1
Quelldatensatz
uspto-grants-2004_06
Patentnummer
US06750252B2

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