Methylparaben → Methyl 4-[1-(tert-butoxycarbonyl)-4,4-difluoro-2-pyrrolidinylmethoxy]benzoate

HRID 354435Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 354435
[C:1]([O:5][C:6]([N:8]1[CH2:12][C:11]([F:14])([F:13])[CH2:10][CH:9]1[CH2:15][OH:16])=[O:7])([CH3:4])([CH3:3])[CH3:2].O[C:18]1[CH:27]=[CH:26][C:21]([C:22]([O:24][CH3:25])=[O:23])=[CH:20][CH:19]=1.C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1>[C:1]([O:5][C:6]([N:8]1[CH2:12][C:11]([F:13])([F:14])[CH2:10][CH:9]1[CH2:15][O:16][C:18]1[CH:27]=[CH:26][C:21]([C:22]([O:24][CH3:25])=[O:23])=[CH:20][CH:19]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2]

Komponenten

6

Edukt 4

HCID 7456MethylparabenHCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 22001352Tert-butyl 4,4-difluoro-2-(hydroxymethyl)pyrrolidine-1-carboxylate

Produkt 1

HCID 69332927Methyl 4-[1-(tert-butoxycarbonyl)-4,4-difluoro-2-pyrrolidinylmethoxy]benzoateAusbeute 88,4 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

To a stirred mixture of 1-(tert-butoxycarbonyl)-4,4-difluoro-2-pyrrolidinylmethanol (600 mg, 2.53 mmol), methyl 4-hydroxybenzoate (462 mg, 3.03 mmol), Ph3P (795 mg, 3.03 mmol) in THF (10 ml) was added DIAD (597 ul, 3.03 mmol) at room temperature. The mixture was heated at reflux for 3 h with stirring. After cooling to room temperature, the mixture was concntrated in vacuo. The residue was chromatographed on silica gel with hexane-EtOAc (4:1) as eluent to give methyl 4-[1-(tert-butoxycarbonyl)-4,4-difluoro-2-pyrrolidinylmethoxy]benzoate (831 mg, 88%) as a colorless oil. 1H-NMR (CDCl3) δ1.48 (s, 9 H), 2.53-2.61 (m, 2 H), 3.63-4.41 (series of m, total 8 H), 6.94 (d, J=8.8 Hz, 2 H), 7.99 (d, J=8.8 Hz, 2 H).

Aufarbeitung

  1. temperatureThe mixture was heated
  2. temperatureat reflux for 3 h
  3. customThe residue was chromatographed on silica gel with hexane-EtOAc (4:1) as eluent

Quellen und Nachweise

ORD-Eintrag
ord-2e0650f0343940eca49601f57dc349cc
Quelldatensatz
uspto-grants-2004_06
Patentnummer
US06756378B2

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