Patent ID: 8623900

Claim:
Compounds of general formula I, wherein: R 1 is an optionally condensed, optionally substituted nitrogen heterocyclic ring, containing one or more nitrogen atoms, at least one of which is an —NH— group; R 2 is hydrogen, straight, branched or cyclic C1-C10 alkyl, straight, branched or cyclic C1-C8 alkylcarbonyl, an optionally substituted arylcarbonyl or arylalkylcarbonyl group; and R 3 is a group of formula II, wherein R 4 and R 5 , which can be the same or different, are hydrogen, straight or branched C1-C8 alkyl or cyclic C3-C7 alkyl, aryl-C1-C5 alkyl or heteroaryl-C1-C5-alkyl, or an aryl or heteroaryl group; and R 6 and R 7 , which can be the same or different, are hydrogen, straight, branched or cyclic C1-C8 alkyl, straight or branched C1-C20 alkylcarbonyl or cyclic C3-C7 alkylcarbonyl optionally containing one or more double bonds, an arylcarbonyl or arylalkylcarbonyl group, straight or branched C1-C10 alkyloxycarbonyl or cyclic C3-C7 alkyloxycarbonyl optionally containing one or more double bonds, an aryloxycarbonyl or arylalkyloxycarbonyl group, an amino group, or a group of general formula III, wherein M is nitrogen, oxygen or sulfur and A is hydrogen or an amino group; the enantiomers, diastereomers or mixtures thereof.