Water → (S)-4-(2,5-dimethoxy-3,4,6-trimethylphenyl)-2-methyl-1,2-butanediol

HRID 1383087Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1383087
[CH3:1][C@:2]([OH:7])([CH2:5]Cl)[CH2:3][OH:4].[CH3:8][O:9][C:10]1[C:15]([CH3:16])=[C:14]([CH3:17])[C:13]([O:18][CH3:19])=[C:12]([CH3:20])[C:11]=1[CH3:21].[H-].[Na+].O>O1CCOCC1>[CH3:1][C@:2]([OH:7])([CH2:5][CH2:17][C:14]1[C:15]([CH3:16])=[C:10]([O:9][CH3:8])[C:11]([CH3:21])=[C:12]([CH3:20])[C:13]=1[O:18][CH3:19])[CH2:3][OH:4]

Komponenten

6

Edukt 4

HCID 962WaterHCID 24758Sodium hydrideHCID 6017651,4-Dimethoxy-2,3,5,6-tetramethylbenzeneHCID 11469077(2R)-2-methyl-3-chloropropane-1,2-diol

Produkt 1

HCID 11129761(S)-4-(2,5-dimethoxy-3,4,6-trimethylphenyl)-2-methyl-1,2-butanediolAusbeute 88,7 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 312751,4-DioxaneLösungsmittel

Versuchsvorschrift

2.4 g (19.6 mmol) of (2R)-2-methyl-3-chloropropane-1,2-diol and 4.28 g (22 mmol) of 2,5-dimethoxy-1,3,4,6-tetramethylbenzene were dissolved in 20 ml of dioxane and heated to reflux temperature within 1 hour with 1.27 g (66 mmol) of sodium hydride (80% in mineral oil) and 0.1 ml of polyethylene glycol 400 (as the phase transfer catalyst) and stirred at this temperature for 16 hours. The mixture was then treated with 50 ml of water, filtered and washed with water. The residue was recrystallized from ether/hexane and there were obtained 4.91 g of (2S)-2-methyl-4-(2,5-dimethoxy-3,4,6-trimethylphenyl)-1,2-butanediol in the form of white crystals with a melting point of 82°-84° C. and [α]D20 =+2.86° (c=1.5% in CHCl3).

Aufarbeitung

  1. temperatureheated
  2. filtrationfiltered
  3. washwashed with water
  4. customThe residue was recrystallized from ether/hexane

Quellen und Nachweise

ORD-Eintrag
ord-9ff4b8c3172e4fa6a37d7b03ecd59a5b
Quelldatensatz
uspto-grants-1989_02
Patentnummer
US04808736

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