Tetrahydrofuran → HCID 86620019, Verbindung

HRID 646631Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 646631
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH2:12][CH2:11][CH2:10][CH:9]=2)=[CH:4][N:3]=1.C1C[O:16]CC1>>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]2[CH2:12][CH2:11][CH2:10][CH2:9]2)=[CH:4][N:3]=1.[Cl:1][C:2]1[N:3]=[CH:4][C:5]([C:8]2([OH:16])[CH2:12][CH2:11][CH2:10][CH2:9]2)=[CH:6][CH:7]=1

Komponenten

4

Edukt 2

HCID 8028TetrahydrofuranHCID 59265941HCID 59265941, Verbindung

Produkt 2

HCID 59265957HCID 59265957, VerbindungAusbeute 26 %HCID 86620019HCID 86620019, VerbindungAusbeute 29 %

Versuchsvorschrift

2-Chloro-5-(cyclopent-1-enyl)pyridine (1.5 g, 8.5 mmol) was dissolved in THF (30 mL) in an oven-dried, nitrogen-flushed 250 mL round bottom flask and the resulting solution cooled in a dry ice/acetone bath under nitrogen. BH3-THF complex (2.4 g, 28.0 mmol, 28 mL of a 1 M solution in THF) was added dropwise with stirring via syringe and the mixture was allowed to warm slowly to room temperature and stir overnight. 2 N NaOH (15 mL), ethanol (15 mL) and 35% H2O2 (10 mL) were added and the mixture stirred for 0.5 h then diluted with EtOAc and 1 N HCl. The layers were separated and the organic layer washed with brine and aq. NaHSO3, dried over Na2SO4, filtered through celite and concentrated. Purification by flash chromatography (hexanes:EtOAc/10:1→2:1) gave in order of elution by-products 2-chloro-5-cyclopentylpyridine (0.45 g, 29%) and 1-(6-chloropyridin-3-yl)-cyclopentanol (0.44 g, 26%) followed by the desired product trans-2-(6-chloropyridin-3-yl)cyclopentanol (0.25 g, 15%) as a clear oil: LC/MS (ESI) m/z 197, 1H NMR (300 MHz, CDCl3) δ 8.26 (d, 1H, J=2.4 Hz), 7.55 (dd, 1H, J=8.4, 2.4 Hz), 7.25 (d, 1H, J=8.4 Hz), 4.12 (m, 1H), 2.88 (m, 1H), 2.24-1.62 (m, 6H).

Aufarbeitung

  1. customflushed 250 mL round bottom flask
  2. temperaturethe resulting solution cooled in a dry ice/acetone bath under nitrogen
  3. additionBH3-THF complex (2.4 g, 28.0 mmol, 28 mL of a 1 M solution in THF) was added dropwise
  4. stirringstir overnight
  5. addition2 N NaOH (15 mL), ethanol (15 mL) and 35% H2O2 (10 mL) were added
  6. stirringthe mixture stirred for 0.5 h
  7. additionthen diluted with EtOAc and 1 N HCl
  8. customThe layers were separated
  9. washthe organic layer washed with brine and aq. NaHSO3
  10. dry with materialdried over Na2SO4
  11. filtrationfiltered through celite and
  12. concentrationconcentrated
  13. customPurification by flash chromatography (hexanes:EtOAc/10:1→2:1)

Quellen und Nachweise

ORD-Eintrag
ord-235eebe58f264de4bfca3ea7eb213407
Quelldatensatz
uspto-grants-2010_04
Patentnummer
US07705156B2

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