Reaktion #2348117

Reaktionsgleichung

1-(2,6,6-trimethylcyclohex-3-enyl)but-2-en-1-one

ethyl diisopropylamine

L-Cystein ethyl ester hydrochloride

→

title compound

Ausbeute 71.0%

Ethyl 2-(4-oxo-4-(2,6,6-trimethylcyclohex-3-enyl)butan-2-ylamino)-3-(4-oxo-4-(2,6,6-trimethylcyclohex-3-enyl)butan-2-ylthio)propanoate

Ausbeute 71.0%

Lösungsmittel

EtOH

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe solvent is removed in vacuo
2. 2
   workup.DISSOLUTIONthe residue dissolved in methyl t-butyl ether
3. 3
   WaschenThe solution is washed with dilute aq. NaCl
4. 4
   Trocknendried over MgSO4
5. 5
   Einengenconcentrated
6. 6
   SonstigeThe residue is purified by chromatography on SiO2

Vorschrift

A solution of 1-(2,6,6-trimethylcyclohex-3-enyl)but-2-en-1-one (83.0 g, 0.50 mol, 2 equiv.), ethyl diisopropylamine (32.3 g, 0.25 mol, 1 equiv.) and L-Cystein ethyl ester hydrochloride (46.5 g, 0.25 mol, 1 equiv.) in EtOH (600 ml) is heated to 60° C. during 44 h. The solvent is removed in vacuo and the residue dissolved in methyl t-butyl ether. The solution is washed with dilute aq. NaCl, dried over MgSO4 and concentrated. The residue is purified by chromatography on SiO2 to yield 85.5 g (71%) of the title compound as orange oil.

Quelle