p-Toluenesulfonic acid → Methyl (4E)-6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxo-5-isobenzofuranyl)-4-methyl-4-hexenoate

HRID 1721652

Reaktionsgleichung

Reaktionsgleichung von HRID 1721652
[OH:1][C:2]1[C:10]([CH2:11]/[CH:12]=[C:13](\[CH3:19])/[CH2:14][CH2:15][C:16]([OH:18])=[O:17])=[C:9]([O:20][CH3:21])[C:8]([CH3:22])=[C:7]2[C:3]=1[C:4](=[O:23])[O:5][CH2:6]2.[C:24]1(C)C=CC(S(O)(=O)=O)=CC=1>CO>[OH:1][C:2]1[C:10]([CH2:11]/[CH:12]=[C:13](\[CH3:19])/[CH2:14][CH2:15][C:16]([O:18][CH3:24])=[O:17])=[C:9]([O:20][CH3:21])[C:8]([CH3:22])=[C:7]2[C:3]=1[C:4](=[O:23])[O:5][CH2:6]2

Komponenten

4

Edukt 2

HCID 6101p-Toluenesulfonic acidHCID 446541Mycophenolic Acid

Produkt 1

HCID 6478685Methyl (4E)-6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxo-5-isobenzofuranyl)-4-methyl-4-hexenoateAusbeute 1.243,2 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 887MethanolLösungsmittel

Versuchsvorschrift

A solution of 15.1 g (47.1 mmol) of (E)-6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxoisobenzofuran-5-yl)-4-methyl-4-hexenoic acid (mycophenolic acid) and 0.7 g (3.7 mmol) of p-toluenesulfonic acid in 400 ml of methanol was allowed to stand at room temperature for 3 days. The mixture was concentrated under reduced pressure to approximately 75 ml and then partitioned between aqueous sodium bicarbonate and ethyl acetate. The organic phase was further washed with brine and then dried over sodium sulfate. Concentration of the organic phase under reduced pressure gave 15.4 g (46.0 mmol, 98%) of methyl (E)-6-(1,3-dihydro-4-hydroxy-6-methoxy-7-methyl-3-oxoisobenzofuran-5-yl)-4-methyl-4-hexenoate as a white solid, mp 104°-105° C.

Aufarbeitung

  1. concentrationThe mixture was concentrated under reduced pressure to approximately 75 ml
  2. custompartitioned between aqueous sodium bicarbonate and ethyl acetate
  3. washThe organic phase was further washed with brine
  4. dry with materialdried over sodium sulfate

Quellen und Nachweise

ORD-Eintrag
ord-cd5a460ab0774e4c99b345f544b78588
Quelldatensatz
uspto-grants-1996_04
Patentnummer
US05512568

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