Patent ID: 8765798

Claim:
Compounds of general formula I in which: one of R and R 1 is hydrogen: and the other is selected from an aryl-C 1 -C 5 -alkyl, heteroaryl-C 1 -C 5 -alkyl group; or an aryl or heteroaryl group optionally substituted with a group selected from hydroxy, methoxy, amino, C 1 -C 5 -mono- or di-alkylamino, C 1 -C 5 -acylamino groups, straight or branched or cyclic alkyl groups, and halogen atom; R 2 , R 3 and R 4 are hydrogen, or an amino group optionally substituted with an alkylcarbonyl, arylcarbonyl, heteroarylcarbonyl, arylalkylcarbonyl, heteroarylalkylcarbonyl, alkyloxycarbonyl, or arylalkyloxycarbonyl group; or: R and R 1 , taken together, form compounds of formula II in which X and Y, which can be the same or different, are a sulfur, nitrogen, or oxygen atom or a CH 2 group, n and m, which can be the same or different, have a value ranging from 0 to 5; or R and R 1 , taken together, form a double bond to give compounds of formula III; R 2 and R 3 , which can be the same or different, are: hydrogen, a straight or branched C 1 -C 20 or cyclic C 3 -C 7 alkylcarbonyl group optionally containing one or more double bonds, an arylcarbonyl or arylalkylcarbonyl group, a straight or branched C 1 -C 10 or cyclic C 3 -C 7 alkyloxycarbonyl group optionally containing one or more double bonds, an aryloxycarbonyl or arylalkyloxycarbonyl group, an amino group, a hydroxy group, a group of general formula IV in which M is nitrogen, oxygen or sulfur and A is hydrogen or an amino group; R 4 is: a hydroxy group, an amino group optionally mono or disubstituted by groups, which can be the same or different, selected from: a straight or branched C 1 -C 20 or cyclic C 3 -C 7 alkyl group, optionally containing one or more double bonds, an aryl or arylalkyl group, and a straight or branched C 1 -C 20 or cyclic C 3 -C 7 alkyloxycarbonyl group, optionally containing one or more double bonds, an aryl, heteroaryl, heteroarylalkyl or arylalkyl group, a straight or branched C 1 -C 10 or cyclic C 3 -C 7 alkoxy group, optionally containing one or more double bonds, an alkoxycarbonyloxyalkoxy or alkylcarbonyloxyalkoxy group bearing a straight, branched or cyclic alkyl, an aryloxy, heteroaryloxy, heteroarylalkyloxy or arylalkoxy group.