Reaktion #5346

Reaktionsgleichung

tetronic acid

triethylamine

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

9-(4-chlorophenoxy)nonanoic acid

HCl

→

3-[9-(4-chlorophenoxy)-1-oxononyl]4-hydroxy-2(5H)-furanone

Ausbeute 30.0%

Lösungsmittel

methanol ethyl acetate

dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionextracted with four 50 mL portions of ether
2. 2
   TrocknenThe combined organic layers are dried over MgSO4
3. 3
   Einengenconcentrated in vacuo
4. 4
   Sonstigeaffording crude compound

Vorschrift

To a stirring solution of 736 mg (7.36 mmol) of tetronic acid in 30 mL of dimethylformamide is added 1.2 mL (8.09 mmol) of triethylamine and 300 mg of 4-dimethylaminopyridine at 0° C. Next, 1.7 g (8.86 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 2.6 g (8.06 mmol) of 9-(4-chlorophenoxy)nonanoic acid are added and the reaction is stirred overnight at room temperature. The reaction is acidified with 1.0 N HCl and extracted with four 50 mL portions of ether. The combined organic layers are dried over MgSO4 and concentrated in vacuo affording crude compound. Pure material is obtained by flash chromatography with 10% methanol/ethyl acetate as eluant affording 800 mg (30%) of 3-[9-(4-chlorophenoxy)-1-oxononyl]4-hydroxy-2(5H)-furanone.

Quelle