R. Jonas et al., SYNTHESIS OF A NEW TYPE OF BENT HETEROCYCLIC BENZIMIDAZOLO-PYRIDAZINONES, European journal of medicinal chemistry, 28(2), 1993, pp. 141-148
The synthesis of some new heterocyclic benzimidazolo-pyridazinones sta
rting from 2,1,3-benzothiadiazole-4-carboxaldehyde 2 is described. Bio
logical evaluation of all new compounds proved them to be inhibitors o
f phosphodiesterase III with no marked positive inotropic effects.