Water → (Z)-9-octadecenoic acid 4-[(tetrahydro-2H-pyran-2-yl)oxy]butyl ester

HRID 5252

Reaktionsgleichung

Reaktionsgleichung von HRID 5252
[C:1]([OH:20])(=[O:19])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8]/[CH:9]=[CH:10]\[CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH3:18].Br[CH2:22][CH2:23][CH2:24][CH2:25][O:26][CH:27]1[CH2:32][CH2:31][CH2:30][CH2:29][O:28]1.C(=O)([O-])[O-].[Cs+].[Cs+].O>O1CCCC1>[O:28]1[CH2:29][CH2:30][CH2:31][CH2:32][CH:27]1[O:26][CH2:25][CH2:24][CH2:23][CH2:22][O:19][C:1](=[O:20])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8]/[CH:9]=[CH:10]\[CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH2:16][CH2:17][CH3:18]

Komponenten

6

Edukt 4

HCID 962WaterHCID 10796Cesium carbonateHCID 445639Oleic AcidHCID 5590192-(4-Bromobutoxy)tetrahydro-2H-pyran

Produkt 1

HCID 67857132(Z)-9-octadecenoic acid 4-[(tetrahydro-2H-pyran-2-yl)oxy]butyl esterAusbeute 100 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

To a stirring solution of 2.0 g (7.0 mmol) of oleic acid and 1.6 g (7.0 mmol) of 2-(4-bromobutoxy)tetrahydro-2H-pyran in 20 mL of tetrahydrofuran is added 2.3 g (7.1 mmol) of cesium carbonate and the reaction mixture is stirred overnight at room temperature. The reaction mixture is poured into water and extracted with three 100 mL portions of ether. The combined organic layers are dried over MgSO4 and concentrated in vacuo affording 2.9 g (100%) of (Z)-9-octadecenoic acid 4-[(tetrahydro-2H-pyran-2-yl)oxy]butyl ester. Next, 500 mg of Dowex 50W 8X resin is added to a stirring solution of 2.9 g (7.0 mmol) of (Z)-9-octadecenoic acid 4-[(tetrahydro-2H-pyran-2-yl)oxy]butyl ester in 100 mL of 1:1 tetrahydrofuran/methanol and the reaction mixture is stirred overnight at room temperature. The reaction mixture is filtered and concentrated in vacuo affording 2.4 g (100%) of alcohol. Next, 11 mL of 2.0M Jones reagent is added at 0° C. to a stirring solution of 2.4 g (7.0 mmol) of alcohol in 75 mL of acetone and the reaction mixture is stirred for 2 hours. The reaction mixture is poured into water and extracted with three 50 mL portions of ether. The combined organic layers are dried over MgSO4 and concentrated in vacuo affording 2.1 g (81%) of title compound.

Aufarbeitung

  1. extractionextracted with three 100 mL portions of ether
  2. dry with materialThe combined organic layers are dried over MgSO4
  3. concentrationconcentrated in vacuo

Quellen und Nachweise

ORD-Eintrag
ord-29b460b072c94947be0258f84aeee882
Quelldatensatz
uspto-grants-1993_09
Patentnummer
US05242945

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