| abstract |
1.- A compound of the formula wherein R is a hydrogen atom or a methyl group; R1 is a hydrogen atom, an N, N-dialkyl (C1-C3) amino group, an N, N-dialkyl (C1-) group C3) amino-N-oxido, an N-alkyl (C1-C3) -N-benzylamino group, an N-acyl (C1-C4) -N-alkyl (C1-C3) amino group, an N- [N , N-dimethylaminoalkyl (C1-C4) amino] acetyl-N-alkyl (C1-C3) amino or a chain of formula WhereA is a hydrogen atom, a phenyl or a five- or six-membered heteroaryl ring having from one to three hetero atoms selected from nitrogen, oxygen and sulfur; X is O, S, SO, SO2 and NR6, and R6 is a hydrogen atom, a linear or branched C1-C3 alkyl, a C1-C3 alkoxycarbonyl group or a benzyloxycarbonyl group; Y is a C6H4 group, a five- or six-membered heteroaryl ring having one to three hetero atoms selected from nitrogen, oxygen and sulfur or is O, S, SO, SO2 or NR6 where R6 has the meaning given above: r is an integer number from 1 to 3; m is an integer number from 1 to 6; n is an integer from 0 to 2; or R1 forms a bond together with R2; R2 is a hydrogen atom or forms a bond together with R1; R3 is a hydroxyl group or forms a group = NO-R5 together with R4 and R5 is a hydrogen atom, a linear or branched C1-C5 alkyl, ... |