Boron trifluoride → 3-Cyclopentyl-2-methoxy-3-oxo-propionic acid methyl ester

HRID 2360580

Reaktionsgleichung

Reaktionsgleichung von HRID 2360580
[C:1](O)(=[O:3])C.C(O)(=O)C.I(C1C=CC=CC=1)=O.B(F)(F)F.[CH2:21]([O:23][C:24](=[O:33])[CH2:25][C:26]([CH:28]1[CH2:32][CH2:31][CH2:30][CH2:29]1)=[O:27])C>CO>[CH3:21][O:23][C:24](=[O:33])[CH:25]([O:3][CH3:1])[C:26]([CH:28]1[CH2:32][CH2:31][CH2:30][CH2:29]1)=[O:27]

Komponenten

5

Edukt 3

HCID 6356Boron trifluorideHCID 11159709Ethyl 3-cyclopentyl-3-oxopropanoateHCID 73357407Acetic acid;iodosylbenzene

Produkt 1

HCID 597772863-Cyclopentyl-2-methoxy-3-oxo-propionic acid methyl ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 887MethanolLösungsmittel

Versuchsvorschrift

The title compound was prepared using a method analogous to that described in Tetrahedron 1998, 44, 1603-1607: To a suspension of iodosobenzene diacetate (5.2 g, 16.3 mmol) in MeOH (40 mL) was added BF3.0Et2 (2.1 mL, 16.3 mmol). The resulting mixture was added to 3-cyclopentyl-3-oxo-propionic acid ethyl ester (3.0 g, 16.3 mmol) and stirred at rt overnight. The mixture was concentrated to half the total volume, quenched with satd. aq. NaHCO3, and extracted with CHCl3 (2×). The combined organic layers were dried and concentrated and the crude residue purified (EtOAc/hexanes) to yield a colorless oil (1.5 g, 43%). 1H NMR (MeOD): 4.4 (s, 1H), 3.8 (s, 3H), 3.5 (s, 3H), 3.3-3.2 (m, 1H), 1.9-1.5 (m, 8H).

Aufarbeitung

  1. concentrationThe mixture was concentrated to half the total volume
  2. customquenched with satd
  3. extractionaq. NaHCO3, and extracted with CHCl3 (2×)
  4. customThe combined organic layers were dried
  5. concentrationconcentrated
  6. customthe crude residue purified (EtOAc/hexanes)

Quellen und Nachweise

ORD-Eintrag
ord-67374e29976643d285c7ad4bdfe39613
Quelldatensatz
uspto-grants-2014_04
Patentnummer
US08686142B2

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