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Sodium hydride → (S)-2,2-dimethyl-4-[2-(5-trifluoromethyl-pyridin-2-yloxy)-ethyl]-oxazolidine-3-carboxylic acid tert-butyl ester

HRID 885203
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 885203
[OH:1][CH2:2][CH2:3][C@H:4]1[CH2:8][O:7][C:6]([CH3:10])([CH3:9])[N:5]1[C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12].[H-].[Na+].Cl[C:21]1[CH:26]=[CH:25][C:24]([C:27]([F:30])([F:29])[F:28])=[CH:23][N:22]=1>C1COCC1.C(OCC)(=O)C>[C:14]([O:13][C:11]([N:5]1[C@@H:4]([CH2:3][CH2:2][O:1][C:21]2[CH:26]=[CH:25][C:24]([C:27]([F:30])([F:29])[F:28])=[CH:23][N:22]=2)[CH2:8][O:7][C:6]1([CH3:10])[CH3:9])=[O:12])([CH3:17])([CH3:16])[CH3:15]
KomponentenReaktionsbedingungenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

6

Edukt 3

HCID 24758Sodium hydrideHCID 923422-Chloro-5-(trifluoromethyl)pyridineHCID 10847957tert-butyl (4S)-4-(2-hydroxyethyl)-2,2-dimethyl-1,3-oxazolidine-3-carboxylate

Produkt 1

HCID 59173205(S)-2,2-dimethyl-4-[2-(5-trifluoromethyl-pyridin-2-yloxy)-ethyl]-oxazolidine-3-carboxylic acid tert-butyl esterAusbeute 82,3 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 8028
Tetrahydrofuran
Lösungsmittel
2×
HCID 8857Ethyl AcetateLösungsmittel

Reaktionsbedingungen

Temperatur
50 °C

Versuchsvorschrift

To a stirred solution of tert-butyl(S)-4-(2-hydroxyethyl)-2,2-dimethyloxazolidine-3-carboxylate (300 mg; CAS 147959-18-0) in THF (4 ml) under an argon atmosphere was added sodium hydride (59 mg, 60% dispersion in oil). The resulting suspension was heated at 50° C. for 20 min and then cooled to 0° C. A solution of 2-chloro-5-trifluoromethyl-pyridine (222 mg) in THF (2 ml) was then added dropwise and the resulting mixture was heated at 70° C. for 3 h. The reaction mixture was cooled to room temperature and diluted with ethyl acetate. The mixture was washed with saturated brine, the phases were separated and the organic phase was dried over sodium sulphate and concentrated in vacuo. The residue was purified by column chromatography (SiO2; gradient: heptane/EtOAc) to give (S)-2,2-dimethyl-4-[2-(5-trifluoromethyl-pyridin-2-yloxy)-ethyl]-oxazolidine-3-carboxylic acid tert-butyl ester (393 mg, 82%) as a colourless oil. MS (ISP): 391.3 ([M+H]+).

Aufarbeitung

  1. temperaturecooled to 0° C
  2. temperaturethe resulting mixture was heated at 70° C. for 3 h
  3. temperatureThe reaction mixture was cooled to room temperature
  4. washThe mixture was washed with saturated brine
  5. customthe phases were separated
  6. dry with materialthe organic phase was dried over sodium sulphate
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by column chromatography (SiO2; gradient: heptane/EtOAc)

Quellen und Nachweise

ORD-Eintrag
ord-a7804bfe0c3c4faaaef42a0b64027fb4
Quelldatensatz
uspto-grants-2012_08
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US08242153B2

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