Reaktion #5355

Reaktionsgleichung

tetronic acid

triethylamine

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

10-(4-chlorophenyl)dec-9-enoic acid

HCl

→

4-hydroxy-3-[10-(4-chlorophenyl)-1-oxodec-9-enyl] -2(5H)-furanone

Ausbeute 58.3%

Lösungsmittel

dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONare added
2. 2
   Extraktionextracted three times with ethyl acetate
3. 3
   WaschenThe combined organic layers are washed with brine
4. 4
   Trocknendried over Na2SO4
5. 5
   Einengenconcentrated in vacuo
6. 6
   SonstigeThe residue is purified via flash chromatography on a 40 mm×150 mm silica gel column
7. 7
   Wascheneluting with 5% methanol/ethyl acetate

Vorschrift

To a stirring solution of 189 mg (1.89 mmol) of tetronic acid in 15 mL of dimethylformamide is added 290 μL (2.08 mmol) of triethylamine and 8 mg (66 μmol) of 4-dimethylaminopyridine at 0° C. Next, 427 mg (2.22 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 690 mg (2.20 mmol) of 10-(4-chlorophenyl)dec-9-enoic acid as a mixture of E and Z isomers 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 ethyl acetate. The combined organic layers are washed with brine, dried over Na2SO4, and concentrated in vacuo. The residue is purified via flash chromatography on a 40 mm×150 mm silica gel column eluting with 5% methanol/ethyl acetate to give 400 mg (58%) of pure 4-hydroxy-3-[10-(4-chlorophenyl)-1-oxodec-9-enyl] -2(5H)-furanone as a mixture of E and Z isomers.

Quelle