(S)-2-Hydroxy-2-(6-(hydroxymethyl)-5-oxo-2,3-dihydro-5H-spiro[indolizine-1,2'-[1,3]dioxolan]-7-yl)-N-((S)-1-phenylethyl)butanamide → (4S)-4-Ethyl-7,8-dihydro-4-hydroxy-1H-pyrano(3,4-f)indolizine-3,6,10(4H)-trione

HRID 868315Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 868315
[CH2:1]([C@:3]([OH:31])([C:15]1[CH:23]=[C:22]2[N:18]([CH2:19][CH2:20][C:21]32OCC[O:24]3)[C:17](=[O:28])[C:16]=1[CH2:29][OH:30])[C:4](N[C@H](C1C=CC=CC=1)C)=[O:5])[CH3:2]>FC(F)(F)C(O)=O>[CH2:1]([C@:3]1([OH:31])[C:15]2[CH:23]=[C:22]3[N:18]([CH2:19][CH2:20][C:21]3=[O:24])[C:17](=[O:28])[C:16]=2[CH2:29][O:30][C:4]1=[O:5])[CH3:2]

Komponenten

3

Edukt 1

HCID 11122829(S)-2-Hydroxy-2-(6-(hydroxymethyl)-5-oxo-2,3-dihydro-5H-spiro[indolizine-1,2'-[1,3]dioxolan]-7-yl)-N-((S)-1-phenylethyl)butanamide

Produkt 1

HCID 10220900(4S)-4-Ethyl-7,8-dihydro-4-hydroxy-1H-pyrano(3,4-f)indolizine-3,6,10(4H)-trioneAusbeute 92,2 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6422Trifluoroacetic acidLösungsmittel

Versuchsvorschrift

Three hundred milligrams of the compound (VII) obtained in the above procedure (1) were dissolved in 80% trifluoroacetic acid solution and the resulting mixture was stirred at room temperature for 2 hours under a nitrogen gas stream. The reaction mixture was concentrated to dryness and the residue was purified by column chromatography on silica gel (10 g). A colorless oily substance was obtained from a 98:2 eluate of chloroform and methanol. The oily substance was crystallized from a mixed solvent of ethanol and petroleum ether to obtain 170 mg of the title compound as colorless needle-like crystals.

Aufarbeitung

  1. concentrationThe reaction mixture was concentrated to dryness
  2. customthe residue was purified by column chromatography on silica gel (10 g)
  3. customA colorless oily substance was obtained from a 98:2 eluate of chloroform and methanol
  4. customThe oily substance was crystallized from a mixed solvent of ethanol and petroleum ether

Quellen und Nachweise

ORD-Eintrag
ord-af3463de5c3049afa97c6e8c001aff25
Quelldatensatz
uspto-grants-1988_10
Patentnummer
US04778891

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