New method of producing 4-aminobut-2-enolides starting from 4-alkoxyfuran-2(5H)-one or 4-arylalkoxyfuran-2-(5H)-one

摘要

Process for the preparation of 4-aminobut-2-enolide compounds of the formula (I): comprising reaction of a 4-alkoxyfuran-2(5H)-one compound or 4-arylalkoxyfuran-2(5H)-one compound of the formula (II) with an amine of the formula (III) in which R1, R2 and A have the definitions given in the description, in the presence of a Brønstedt acid.