Benzo-fused heterocyclic compounds having a 5-membered ring processes for their preparation their use as medicaments their use as diagnostic agents and medicaments containing them

A benzo-fused heterocyclic compound having a 5-membered ring of the formula (I) ##STR6## or a pharmaceutical tolerated salt thereof, in which:

• X is CR(6);
• Y is NR(7);
• A and B
• together are a bond or are both hydrogen;
• one of the substituents R(1) to R(6) is a --CO--N.dbd.C(NH.sub.2).sub.2 group;
• the other respective substituents R(1) to R(6) are independently hydrogen, F, Cl, Br, I or (C.sub.1 -C.sub.6)-alkyl;
• up to two of the other substituents R(1) to R(6) are independently CN, NO.sub.2, N.sub.3, (C.sub.1 -C.sub.4)-alkoxy or CF.sub.3 ;
• up to one of the other substituents is R(8)--C.sub.n H.sub.2n --Z;
• n is zero to 10;
• wherein the alkylene chain --C.sub.n H.sub.2n -- is a straight-chain or is branched and
• wherein a carbon atom is optionally replaced by an oxygen atom, an S atom or an N atom;
• R(8) is hydrogen, (C.sub.2 -C.sub.6)-alkenyl or (C.sub.3 -C.sub.10)-cycloalkyl, which is unsubstituted or substituted by 1 to 4 methyl groups or an OH group, or has an ethylene group --CH.dbd.CH--, and wherein a methylene group is optionally replaced by an oxygen atom, an S atom or an N atom;
• or
• R(8) is phenyl, which is unsubstituted or substituted by 1 to 3 substituents selected from the group consisting of F, Cl, Br, I, CF.sub.3, CH.sub.3 --S(O).sub.s -- and R(9)--W.sub.y --;
• s is zero, 1 or 2;
• R(9) is H, methyl or ethyl;
• W is oxygen or NR(10);
• R(10) is H or methyl;
• y is zero or 1;
• or
• R(8) is C.sub.m F.sub.2m+1 ;
• m is 1 to 3;
• or
• R(8) is 1- or 2-naphthyl, pyridyl, quinolyl or isoquinolyl;
• Z is --CO, CH.sub.2 -- or ›CR(11)(OH)!.sub.q ;
• q is 1, 2 or 3;
• R(11) is H or methyl;
• or
• Z is oxygen or --NR(12)--;
• R(12) is H or methyl;
• or
• Z is --S(O).sub.s --;
• s is zero, 1 or 2;
• or
• Z is --SO.sub.2 --NR(13)--;
• R(13) is H or (C.sub.1 -C.sub.4)-alkyl;
• and
• R(7) is hydrogen, (C.sub.1 -C.sub.10)-alkyl, (C.sub.2 -C.sub.10)-alkenyl or R(8)--C.sub.n H.sub.2n --.