2-(Trimethylsilylmethyl)allyl acetate → Methyl (+-)-trans-4-methylene-2-(3-fluorophenyl)cyclopentanoate

HRID 8776

Reaktionsgleichung

Reaktionsgleichung von HRID 8776
[F:1][C:2]1[CH:3]=[C:4]([CH:11]=[CH:12][CH:13]=1)/[CH:5]=[CH:6]/[C:7]([O:9][CH3:10])=[O:8].C(O[CH2:18][C:19]([CH2:21][Si](C)(C)C)=[CH2:20])(=O)C>C1COCC1.CCCCCC.[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)CCP(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>[CH2:18]=[C:19]1[CH2:21][C@@H:6]([C:7]([O:9][CH3:10])=[O:8])[C@H:5]([C:4]2[CH:11]=[CH:12][CH:13]=[C:2]([F:1])[CH:3]=2)[CH2:20]1

Komponenten

7

Edukt 2

HCID 44283472-(Trimethylsilylmethyl)allyl acetateHCID 13415099Methyl (E)-3-fluorocinnamate

Produkt 1

HCID 53991082Methyl (+-)-trans-4-methylene-2-(3-fluorophenyl)cyclopentanoateAusbeute 83,9 %

Reagenzien, Katalysatoren, Lösungsmittel 4

HCID 742671,2-Bis(diphenylphosphino)ethaneKatalysatorHCID 11979704Tetrakis(triphenylphosphine)palladiumKatalysatorHCID 8028TetrahydrofuranLösungsmittelHCID 8058HexaneLösungsmittel

Versuchsvorschrift

A mixture of methyl trans-3-fluorocinnamate (41.25 g, 229 mmol), tetrakis(triphenylphosphine) palladium(0) (18.5 g, 16 mmol), 1,2-bis(diphenylphosphino)ethane (5.5 g, 13.7 mmol), and 2-((trimethylsilyl)methyl)-2-propen-1-yl acetate (42.66 g, 229 mmol) in THF (300 mL) under nitrogen was heated to reflux for 6 h and then stirred at room temperature for 16 h. The reaction was diluted with hexane and filtered to remove the yellow precipitate. The volatiles were then removed in vacuo and the residue was purified by FC (3 to 5% ethyl acetate in hexanes) to afford the title compound (45 g).

Aufarbeitung

  1. temperaturewas heated
  2. temperatureto reflux for 6 h
  3. filtrationfiltered
  4. customto remove the yellow precipitate
  5. customThe volatiles were then removed in vacuo
  6. customthe residue was purified by FC (3 to 5% ethyl acetate in hexanes)

Quellen und Nachweise

ORD-Eintrag
ord-7a5cb637174d4ad49a54d0c4b3153ed7
Quelldatensatz
uspto-grants-2006_08
Patentnummer
US07091211B2

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