Reaktion #5363

Reaktionsgleichung

thiotetronic acid

triethylamine

1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride

petroselinic acid

HCl

→

4-hydroxy-3-[(Z)-1-oxo-6-octadecenyl]-2(5H)-thiophenone

Ausbeute 21.4%

Lösungsmittel

dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionextracted three times with diethyl ether
2. 2
   WaschenThe combined organic layers are washed with brine
3. 3
   Trocknendried over Na2SO4
4. 4
   Filtrationfiltered
5. 5
   Einengenconcentrated in vacuo
6. 6
   Wascheneluting with 100% ethyl acetate

Vorschrift

To a stirring solution of 1.71 g (14.7 mmol) of thiotetronic acid in 20 mL of dimethylformamide is added 2.22 mL (15.9 mmol) of triethylamine and 592 mg (4.85 mmol) of 4-dimethylaminopyridine at 0° C. Next, 3.38 g (17.6 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 5.0 g (17.7 mmol) of petroselinic acid are added and the reaction mixture is stirred overnight at room temperature. The reaction is acidified with 1.0N HCl and extracted three times with diethyl ether. The combined organic layers are washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo. The residue is subjected to HPLC chromatography (2 inch Dynamax silica gel column, 25 mL/min) eluting with 100% ethyl acetate to give 1.2 g (21%) of 4-hydroxy-3-[(Z)-1-oxo-6-octadecenyl]-2(5H)-thiophenone as an oil.

Quelle