Patent ID: 8217053

Claim:
Compounds of general formula I: wherein: R is F, Cl, Br, I, —N3, NH2, —NR′R″, —COOR′, —CONR′R″, —NHR″′-NR′R″ in which R′, R″ and R″′ can be H, alkyl, aryl, arylalkyl, acyl, alkoxycarbonyl, aryloxycarbonyl; R1 is alkyl, aminoalkyl, hydroxyalkyl, nitrite, alkoxymino, aryloxymino, silylalkyl; R2 is hydrogen, hydroxyl, alkoxy, aminoalkyl; R3 is hydrogen, optionally protected hydroxyl, alkoxy, aminoalkyl, wherein the alkyl groups, acyl, alkoxy, aminoalkyl or alkoxymino can contain 1 to 8 carbon atoms, in a straight or branched chain, and the groups aryl and aryloxy can contain 5 to 10 carbon atoms; the pharmaceutically acceptable salts, isomers, enantiomers, diastereomers thereof and corresponding mixtures.