Acetic Acid → Ethyl (2Z)-3-[4-(benzyloxy)-3-methylphenyl]-2-ethoxyacrylate

HRID 353308Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 353308
[CH2:1]([O:8][C:9]1[CH:16]=[CH:15][C:12]([CH:13]=O)=[CH:11][C:10]=1[CH3:17])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:18]([O:20][CH2:21][C:22]([O:24][CH2:25][CH3:26])=[O:23])[CH3:19].CC(C)([O-])C.[K+].C(O)(=O)C.C1(C)C=CC(S(O)(=O)=O)=CC=1>C1COCC1.C1(C)C=CC=CC=1>[CH2:1]([O:8][C:9]1[CH:16]=[CH:15][C:12](/[CH:13]=[C:21](\[O:20][CH2:18][CH3:19])/[C:22]([O:24][CH2:25][CH3:26])=[O:23])=[CH:11][C:10]=1[CH3:17])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Komponenten

8

Edukt 5

HCID 176Acetic AcidHCID 6101p-Toluenesulfonic acidHCID 69955Ethyl ethoxyacetateHCID 202986464-(Benzyloxy)-3-methylbenzaldehydeHCID 23665647Potassium tert-butoxide

Produkt 1

HCID 68616271Ethyl (2Z)-3-[4-(benzyloxy)-3-methylphenyl]-2-ethoxyacrylateAusbeute 25 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 1140TolueneLösungsmittelHCID 8028TetrahydrofuranLösungsmittel2×

Reaktionsbedingungen

Temperatur
-20 °C

Versuchsvorschrift

4-(Benzyloxy)-3-methylbenzaldehyde (2.36 g; 10.2 mmole) and ethyl ethoxyacetate (1.62 g; 12.3 mmole) were dissolved in dry THF (10 ml) and cooled to −20° C. Potassium tert-butoxide (1.38 g; 12.3 mmole) dissolved in dry tetrahydrofuran (1 ml) was slowly added and the reaction was stirred over night at −20° C. The reaction was quenched with acetic acid (0.80 g; 13.3 mmole). The crude product was isolated, redissolved in toluene and refluxed overnight with p-toluenesulfonic acid (0.18 g; 1.0 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, 10 μm, 50×500 mm) using acetronitrile (50-100%) in ammonium acetate buffer (pH 7) as mobile phase gave 0.86 g (25% yield) of ethyl (2Z)-3-[4-(benzyloxy)-3-methylphenyl]-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, 10 μm, 50×500 mm)

Quellen und Nachweise

ORD-Eintrag
ord-df3f7efd7d2142ceac1d36c76767c65b
Quelldatensatz
uspto-grants-2004_06
Patentnummer
US06750252B2

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