Compounds useful in the treatment of patients suffering from senile dementia, Alzheimer's disease or memory defects, of the formula IMAGE in which R represents hydrogen or a linear, branched or cyclic alkyl, alkenyl, or alkynyl, containing up to 8 carbon atoms, or the radical IMAGE in which R1 represents a linear or branched, alkyl, alkenyl or alkynyl, containing up to 8 carbon atoms, a linear or branched, saturated or unsaturated, alkoxy containing up to 8 carbon atoms, or aryl containing up to 14 carbon atoms, or the radical IMAGE in which R2 represents a linear or branched alkyl, alkenyl or alkynyl, containing up to 8 carbon atoms, aryl containing up to 14 carbon atoms, possibly substituted, or aralkyl containing up to 18 carbon atoms, possibly substituted, and R' represents a linear, branched or cyclic alkyl, alkenyl or alkynyl, containing up to 8 carbon atoms, as well as their addition salts with organic or mineral acids.
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