Quinolone cardiac stimulants.

摘要

Quinolone cardiac stimulants of the formula:-
<CHEM>
or a pharmaceutically acceptable salt thereof,
wherein "Het" is a 5-membered monocyclic aromatic heterocyclic group containing at least one nitrogen atom in the aromatic ring and attached by a nitrogen atom to the 5-, 6-, 7- or 8- position of the quinolone;
"Het" being substituted by a group selected from - @-(C1-C4 alkyl), -R<1>, - @-R<1> and -@-R<2> wherein R<1> is a phenyl group optionally substituted by 1 to 3 substituents each independently selected from C1-C4 alkyl, C1-C4 alkoxy, hydroxy, halo, trifluoromethyl, -CONR<3>R<4>, -SO2NR<3>R<4>, -N(R<3>)SO2(C1-C4 alkyl) and-S(O)n(C1-C4 alkyl) where R<3> and R<4> are each H or C1-C4 alkyl and n is 0, 1 or 2, and R<2> is a heterocyclic group selected from thienyl, furyl, imidazolyl, triazolyl and tetrazolyl, said heterocyclic group being attached to the adjacent carbonyl group by a ring carbon atom and being optionally substituted by up to two substituents each independently selected from C1-C4 alkyl, C1-C4 alkoxy and halo;
"Het" also being optionally substituted by up to two C1-C4 alkyl groups;
and R, which is attached to the 5-, 6-, 7- or 8- position of the quinolone, is H, C1-C4 alkyl, C1-C4 alkoxy, hydroxy, CF3, halo, cyano or hydroxymethyl.