Reaktion #76172

Reaktionsgleichung

cyclopropylamine

ethyl pentafluorobenzoylacetate

triethyl orthoformate

diacetyl oxide

→

ethyl 2-(pentafluorobenzoyl)-3-cyclopropylaminoacrylate

Ausbeute 72.0%

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigewere evaporated under reduced pressure
2. 2
   workup.ADDITIONTo the residue was added 250 ml of anhydrous ethanol
3. 3
   FiltrationThe resultingt mixture was filtered under suction
4. 4
   SonstigeThe residue was re-crystallized from a mixture of petroleum ether and cyclohexane

Vorschrift

70.5 g of ethyl pentafluorobenzoylacetate (0.25 mol), 66.6 g of triethyl orthoformate (0.45 mol) and 77.4 g of diacetyl oxide (0.72 mol) were stirred at 150° C. for 2.5 hours. Fractions having a lower boiling point were evaporated under reduced pressure. To the residue was added 250 ml of anhydrous ethanol. 14.5 g of cyclopropylamine (0.25 mol) was added to the solution under cooling of ice water and the reaction was then carried out at room temperature for 2 hours. The resultingt mixture was filtered under suction. The residue was re-crystallized from a mixture of petroleum ether and cyclohexane to yield 62.8 g (0.18 mol) of ethyl 2-(pentafluorobenzoyl)-3-cyclopropylaminoacrylate in 72.0% yield, mp 88-91° C.

Quelle