... Different biological activity of the coumarins fused with other heterocycles in 3,4-positions [5-13] prompted the synthesis of coumarino [4,3-c]-N1-substituted pyra- zoles. ... [12] D. Herber, IC Ivanov and SK Karagiosov, J. Heterocyclic Chem., 32 ... [25] HR Eisenhauer, KP Link, J. Amer. ...