Process for the preparation of 4-aminobut-2-enolide compounds of the formula (I):; comprisingreaction 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.
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