Reaktion #3781

Reaktionsgleichung

Triphenylphosphine ethylbromide

sodium hydride dimethyl sulfoxide

4,6-dimethoxy-2-hydroxybenzaldehyde

→

3,5-dimethoxy-2-propylphenol

Ausbeute 46.4%

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeat 50° C.
2. 2
   Sonstigeovernight
3. 3
   SonstigeAfter the termination of the reaction
4. 4
   Sonstigethe resulting solution was partitioned with ethyl acetate and dilute hydrochloric acid
5. 5
   Waschenthe resulting ethyl acetate phase was washed in water and subsequently in a saturated sodium chloride solution
6. 6
   Trocknendried over anhydrous magnesium sulfate
7. 7
   workup.DISTILLATIONto distill off the solvents under reduced pressure
8. 8
   SonstigeThe residue was purified by silica gel column chromatography (developing solvent: hexane:ethyl acetate=3:1)
9. 9
   workup.ADDITIONfollowed by addition of a catalytic amount of platinum dioxide for hydrogenation

Vorschrift

Triphenylphosphine ethylbromide (4.1 g) was added to a 2N sodium hydride/dimethyl sulfoxide solution (11 ml), prior to agitation at 50° C. for 30 minutes. To the mixture was added 4,6-dimethoxy-2-hydroxybenzaldehyde (1 g), for agitation at 50° C. overnight. After the termination of the reaction, the resulting solution was partitioned with ethyl acetate and dilute hydrochloric acid, and the resulting ethyl acetate phase was washed in water and subsequently in a saturated sodium chloride solution and dried over anhydrous magnesium sulfate, to distill off the solvents under reduced pressure. The residue was purified by silica gel column chromatography (developing solvent: hexane:ethyl acetate=3:1), followed by addition of a catalytic amount of platinum dioxide for hydrogenation, to recover 3,5-dimethoxy-2-propylphenol (0.5 g; yield of 46%). By 1H-NMR (90 MHz, CDCl3), the compound has the peaks shown below.

Quelle