Reaktion #81778

Reaktionsgleichung

ethyl 10-bromoundecanoate

3-iodophenol

potassium carbonate

EtOAc

→

ethyl 10-(3-iodophenoxy)-undecanoate

Ausbeute 33.3%

Lösungsmittel

DMF

DMF

—

hexanes

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction was immersed in an oil bath
2. 2
   Temperaturthe oil bath temperature was increased to 85° C
3. 3
   workup.STIRRINGAfter stirring for an additional 4 hrs at 85° C.
4. 4
   Temperaturto cool
5. 5
   Filtrationfiltered through a pad of celite
6. 6
   Sonstigeevaporated in vacuo
7. 7
   WaschenThe organic phase was washed with water (100 ml), 1M aqueous sodium hydroxide (100 ml), water (2×100 ml) and brine (100 ml)
8. 8
   Trocknendried (Na2SO4)
9. 9
   Filtrationfiltered
10. 10
    Sonstigeevaporated in vacuo
11. 11
    Sonstigeto provide crude ethyl 10-(3-iodophenoxy)-undecanoate which

Vorschrift

To a stirred solution of ethyl 10-bromoundecanoate (9.7 g, 33.0 mmol) in dry DMF (66 ml) was added 3-iodophenol (7.99 g, 36.3 mmol) and potassium carbonate (5.02 g, 37.6 mmol). The reaction was immersed in an oil bath which was warmed to 75° C. over 0.5 hr. After stirring for 14 hrs under an N2 atmosphere, the oil bath temperature was increased to 85° C. After stirring for an additional 4 hrs at 85° C., the reaction was allowed to cool, diluted with DMF (200 ml), filtered through a pad of celite and evaporated in vacuo. The resulting residue was taken up in ether (500 ml). The organic phase was washed with water (100 ml), 1M aqueous sodium hydroxide (100 ml), water (2×100 ml) and brine (100 ml), dried (Na2SO4), filtered and evaporated in vacuo to provide crude ethyl 10-(3-iodophenoxy)-undecanoate which was contaminated with olefinic esters. Flash column chromatography (silica, 1-2%; EtOAc in hexanes) provide ethyl 10-(3-iodophenoxy)-undecanoate as a clear oil (4.75 g, 33.3%).

Quelle