Acetic acid, 2-(triphenylphosphoranylidene)-, ethyl ester → 2-O-tert-butyl 4-O-ethyl 5-(3-ethoxy-3-oxoprop-1-enyl)-3-methyl-1H-pyrrole-2,4-dicarboxylate

HRID 2191393Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2191393
[CH2:1]([O:3][C:4]([C:6]1[C:7]([CH3:20])=[C:8]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[NH:9][C:10]=1[CH:11]=O)=[O:5])[CH3:2].[CH2:21]([O:23][C:24]([CH:26]=P(C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)=[O:25])[CH3:22]>O1CCCC1.CCCCCC.C(OCC)(=O)C>[CH2:1]([O:3][C:4]([C:6]1[C:7]([CH3:20])=[C:8]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[NH:9][C:10]=1[CH:11]=[CH:26][C:24]([O:23][CH2:21][CH3:22])=[O:25])=[O:5])[CH3:2]

Komponenten

6

Edukt 2

HCID 70670Acetic acid, 2-(triphenylphosphoranylidene)-, ethyl esterHCID 98142842-O-tert-butyl 4-O-ethyl 5-formyl-3-methyl-1H-pyrrole-2,4-dicarboxylate

Produkt 1

HCID 685279692-O-tert-butyl 4-O-ethyl 5-(3-ethoxy-3-oxoprop-1-enyl)-3-methyl-1H-pyrrole-2,4-dicarboxylateAusbeute 84 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 8028TetrahydrofuranLösungsmittelHCID 8058HexaneLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

5-Formyl-3-methyl-1H-pyrrole-2,4-dicarboxylic acid 2-tert-butyl ester 4-ethyl ester 1 b (23 g, 81.7 mmol) and (ethoxycarbonylmethylene)triphenylphosphorane (34.66 g, 99.4 mmol) were dissolved in 450 ml of tetrahydrofuran, and stirred at room temperature overnight under an argon atmosphere. After thin lay chromatography showed the disappearance of starting materials, the reaction mixture was concentrated under reduced pressure to obtain a yellow oil. The residue was dissolved in the solvent mixture of n-hexane and ethyl acetate (V:V=20:1), and purified by sand funnel decompression column chromatography to obtain the title compound 5-(2-ethoxycarbonyl-vinyl)-3-methyl-1H-pyrrole-2,4-dicarboxylic acid 2-tert-butyl ester 4-ethyl ester 1c (24 g, yield 84%) as a light yellow solid.

Aufarbeitung

  1. concentrationthe reaction mixture was concentrated under reduced pressure
  2. customto obtain a yellow oil
  3. custompurified by sand funnel decompression column chromatography

Quellen und Nachweise

ORD-Eintrag
ord-b5d3d6ec95624d939ee608e838a375e7
Quelldatensatz
uspto-grants-2012_12
Patentnummer
US08329682B2

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