Dimethyl Sulfoxide → HCID 69769063, Verbindung

HRID 1529841Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1529841
C[O-].[Na+].CS(C)=O.CO[C:10](=[O:24])[CH2:11][CH2:12][C:13]([CH2:15][CH2:16][CH2:17][CH2:18][O:19][CH2:20][CH2:21][O:22][CH3:23])=[O:14]>C1(C)C=CC=CC=1>[CH3:23][O:22][CH2:21][CH2:20][O:19][CH2:18][CH2:17][CH2:16][CH:15]1[C:10](=[O:24])[CH2:11][CH2:12][C:13]1=[O:14]

Komponenten

5

Edukt 3

HCID 679Dimethyl SulfoxideHCID 10942334Sodium Methoxide2×HCID 86601513HCID 86601513, Verbindung

Produkt 1

HCID 69769063HCID 69769063, VerbindungAusbeute 82,5 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1140TolueneLösungsmittel2×

Versuchsvorschrift

In a 5 L 3-neck round bottom flask fitted with mechanical stirrer, a distillation system, a 2 L dropping funnel, and an argon inlet, was poured sodium methoxide solution (25 wt. % solution in methanol, 200 mL). Toluene (1.0 L) was added and methanol was removed off by distillation with an heating mantle. To the sodium methoxide suspension, methyl sulfoxide (13.4 mL, 0.4 eq) was added and a solution of 44 (121.0 g, 0.46 mol) in toluene (2.0 L) was slowly added over a period of 2 h. The distillation was continued during the addition and additional 30 minutes (until 0.5 L residual toluene). The reaction mixture was cooled and water (1 L) was added. Toluene was extracted and thrown away. The aqueous phase was acidified with 10% HCl until pH 1 and extracted with dichloromethane (4×800 mL). The combined organic phase was washed with brine, dried over magnesium sulfate, and rotary evaporated to give the cyclopentanedione 45 (81.3 g, 75%) as a brown heavy oil. 1H NMR (400 MHz, CD3OD) δ 2.42 (t, J=7.1 Hz, 2H), 2.51 (s, 4H), 3.38 (s, 3H), 3.55-3.61 (m, 4H), 3.67 (m, 2H), 4.68 (s, 2H) ppm.

Aufarbeitung

  1. customIn a 5 L 3-neck round bottom flask fitted with mechanical stirrer
  2. custommethanol was removed off by distillation with an heating mantle
  3. distillationThe distillation
  4. additionwas continued during the addition and additional 30 minutes (until 0.5 L residual toluene)
  5. temperatureThe reaction mixture was cooled
  6. additionwater (1 L) was added
  7. extractionToluene was extracted
  8. extractionextracted with dichloromethane (4×800 mL)
  9. washThe combined organic phase was washed with brine
  10. dry with materialdried over magnesium sulfate
  11. customrotary evaporated

Quellen und Nachweise

ORD-Eintrag
ord-1b9ed78539d044f9afa6777d498682e6
Quelldatensatz
uspto-grants-2015_07
Patentnummer
US09090651B2

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