Tetrahydrofuran → (S)-4-isopropyl-3-(4-pentenoyl)-oxazolidin-2-one

HRID 1683382

Reaktionsgleichung

Reaktionsgleichung von HRID 1683382
[CH3:1][CH:2]([CH:4]1[CH2:8][O:7][C:6](=[O:9])[NH:5]1)[CH3:3].C([Li])CCC.[CH2:15](Cl)[CH2:16][CH2:17][CH:18]=[CH2:19].[O:21]1CCCC1>CCCCCC.[Cl-].[NH4+].C(OCC)C>[CH3:1][CH:2]([C@H:4]1[CH2:8][O:7][C:6](=[O:9])[N:5]1[C:15](=[O:21])[CH2:16][CH2:17][CH:18]=[CH2:19])[CH3:3]

Komponenten

8

Edukt 4

HCID 8028Tetrahydrofuran2×HCID 5193532-Oxazolidinone, 4-(1-methylethyl)-HCID 5230425-Chloro-1-penteneHCID 178418339Butyllithium

Produkt 1

HCID 11820460(S)-4-isopropyl-3-(4-pentenoyl)-oxazolidin-2-one

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 3283Diethyl EtherLösungsmittelHCID 8058HexaneLösungsmittelHCID 25517Ammonium ChlorideLösungsmittel

Versuchsvorschrift

To a -78° C. solution of 5.0 g of 4-(1-methylethyl)-2-oxazolidinone in 80 ml of tetrahydrofuran is added, dropwise, 15.5 ml of 2.5M n-butyl lithium in hexane. After stirring for 30 minutes, a solution of 4.8 g of 4-pentenyl chloride in 30 ml of tetrahydrofuran is added, dropwise, and the resulting solution is stirred at -78° C. for 3.5 hours. The reaction is diluted with aqueous ammonium chloride and diethyl ether. The organic layer is washed with water, dried and concentrated in vacuo. The residue is purified by chromatography (silica gel, 25% ethyl acetate/petroleum ether) to give 5.8 g of the desired product as a pale yellow oil.

Aufarbeitung

  1. stirringdropwise, and the resulting solution is stirred at -78° C. for 3.5 hours
  2. washThe organic layer is washed with water
  3. customdried
  4. concentrationconcentrated in vacuo
  5. customThe residue is purified by chromatography (silica gel, 25% ethyl acetate/petroleum ether)

Quellen und Nachweise

ORD-Eintrag
ord-baf9a4001da747f2947a4254afd19bdc
Quelldatensatz
uspto-grants-1997_06
Patentnummer
US05637731

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