Tetrahydrofuran → (1S,4aS,7aR)-1-[1-(ethoxy)ethoxy]-7-[2-(hydroxy)ethyl]-1,4a,5,7a-tetrahydrocyclopenta[c]pyrane-4-carboxylic acid methylester

HRID 1976369Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1976369
[CH3:1][O:2][C:3]([C:5]1[C@H:6]2[CH2:19][CH:18]=[C:17]([CH:20]=O)[C@@H:7]2[C@H:8]([O:11][CH:12]([O:14][CH2:15][CH3:16])[CH3:13])[O:9][CH:10]=1)=[O:4].CI.[Mg].[Cl-].[NH4+].[O:27]1CCC[CH2:28]1>>[CH3:1][O:2][C:3]([C:5]1[C@H:6]2[CH2:19][CH:18]=[C:17]([CH2:20][CH2:28][OH:27])[C@@H:7]2[C@H:8]([O:11][CH:12]([O:14][CH2:15][CH3:16])[CH3:13])[O:9][CH:10]=1)=[O:4]

Komponenten

5

Edukt 4

HCID 8028TetrahydrofuranHCID 25517Ammonium ChlorideHCID 57167711HCID 57167711, VerbindungHCID 86584867HCID 86584867, Verbindung

Produkt 1

HCID 57042520(1S,4aS,7aR)-1-[1-(ethoxy)ethoxy]-7-[2-(hydroxy)ethyl]-1,4a,5,7a-tetrahydrocyclopenta[c]pyrane-4-carboxylic acid methylesterAusbeute 77 %

Reaktionsbedingungen

Temperatur
-78 °C

Versuchsvorschrift

An anhydrous tetrahydrofuran solution containing 100 mg of (1S,4aS,7aR)-1-[1-(ethoxy) ethoxy]-7-formyl-1,4a,5,7a-tetrahydrocyclopenta [c] pyrane-4-carboxylic acid methylester was cooled to −78 ° C. under argon gas atmosphere followed by dropping 0.38 ml of magnesium methyliodide (0.98 M tetrahydrofuran solution). Two hours later, saturated aqueous ammonium chloride solution was added to the reaction mixture followed by extraction with ethyl acetate. After washing the organic phase with brine, it was dried over magnesium sulfate. After distilling off the solvent under reduced pressure, the residue was purified by silica gel chromatography to obtain a pale yellow oil from the hexane-ether eluate in the form of (1S,4aS,7aR)-1-[1-(ethoxy) ethoxy]-7-[2-(hydroxy) ethyl]-1,4a,5,7a-tetrahydrocyclopenta [c] pyrane-4-carboxylic acid methylester (81 mg, yield: 77%). The physicochemical properties of this compound are described below.

Aufarbeitung

  1. extractionfollowed by extraction with ethyl acetate
  2. washAfter washing the organic phase with brine, it
  3. dry with materialwas dried over magnesium sulfate
  4. distillationAfter distilling off the solvent under reduced pressure
  5. customthe residue was purified by silica gel chromatography

Quellen und Nachweise

ORD-Eintrag
ord-f6bb75f0ab494c1695530496d0b3a330
Quelldatensatz
uspto-grants-2001_05
Patentnummer
US06225478B1

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