abstract |
The invention relates to a method for producing 4-aminobut-2-enolide compounds of the formula (I), comprising: converting a 4-alkoxyfuran-2(5H)-on compound or 4-arylalkoxyfuran-2(5H)-on compound of the formula (II) and an amine of the formula (III), where R 1 , R 2 , and A have the definitions indicated in the description, in the presence of a Brønstedt acid. |