| abstract |
Novel compounds of the formula IIIa <IMAGE> IIIa wherein R1a, R2a, R3a and R4a are the same or different and are hydrogen, an alkyl, alkoxy optionally completely or predominantly substituted by fluorine or chlorine, halogen, -CN, -CF3, -NO2, -COR, -COOR, aryl, aryloxy or arylalkoxy group, or adjacent groups R1a, R2a, R3a and R4a together with the adjacent carbon atoms in the benzimidazole ring form a 5-, 6- or 7-membered monocyclic ring or a 9-, 10- or 11-membered bicyclic ring, which rings may be saturated or unsaturated and may contain 0-3 heteroatoms selected from N and O and which rings may be optionally substituted with 1-4 substitutents selected from alkyl groups with 1-3 carbon atoms, halogen perferably F or Cl, alkylene radicals containing 4-5 carbon atoms giving spiro compounds, or two or four of these substituents together form one or two oxy groups <IMAGE> whereby if R1a, R2a, R3a and R4a together with the adjacent carbon atoms in the benzimidazole ring form two rings they may be condensed with each other, R5a is hydrogen or an alkyl group, R6a is hydrogen or an alkyl group or R5a and R6a are joined together to form an alkylene chain, R7a is hydrogen, an alkyl, alkoxy, alkenyloxy, or alkynyloxy group, R8a is hydrogen or an alkyl group, or R6a and R7a, or R7a and R8a together with the adjacent carbon atoms in the pyridinium ring form a ring wherein the part constituted by R6a and R7a or R7a and R8a, is -CH=CH-CH=CH-, -O-(CH2)p-, -CH2(CH2)p-, -O-CH=CH-, -NH-CH=CH-, <IMAGE> or -S-(CH2)p-, wherein p is 2, 3 or 4 and the O, S and N atoms always are attached to position 3 in the compound IIIa, R is an alkyl, cycloalkyl, aryl or arylalkyl group, and X-is a pharmaceutically acceptable anion, process for preparation thereof, pharmaceutical compositions containing such compounds and their use in medicine. |