| abstract |
A compound of formula (I): ** Formula ** in which R1 and R2 are independently of each other hydrogen; X represents a methylene group; Y represents an oxygen or sulfur atom; n represents the number 0, 1, 2 or 3 and m represents the number 0 or 1; R3 represents a pyridine N-oxide group according to formula A, B or C, which is connected as indicated by the unlabeled link: ** Formula ** where R4, R5, R6 and R7 independently of each other they represent hydrogen, C1-C6 alkyl, C1-C6 thioalkyl, C1-C6 alkoxy, C6-C12 aryloxy or a C6-C12 thioaryl group, C1-C6 alkanoyl or a C7-C13 aroyl group, amino, C1-C6 alkylamino, dialkylamino C1-C6, C3-C12 cycloalkylamino or C3-C12 heterocycloalkylamino, C1-C6 alkylsulfonyl or C6-C12 arylsulfonyl, halogen, C1-C6 haloalkyl, trifluoromethyl, cyano, nitro or a heteroaryl group; or where two or more of the R4, R5, R6 and R7 moieties taken together represent aliphatic or heteroaliphatic rings or aromatic or heteroaromatic rings and in which P represents a central unit selected from 1,2,4-oxadiazol-3 regioisomers, 5-diyl and 1,3,4-oxadiazol-2,5-diyl, and wherein the central unit regioisomers include both regioisomers achievable by exchanging the nitrocatechol moiety and the moiety - (X) n- (Y) m -R3. |