A multicomponent reaction for the synthesis of fused azo‐linked pyrazolo[4,3‐e]pyridines from 3‐amino‐5‐methylpyrazole, indan‐1,3‐dione and synthesized azo‐linked aldehydes using nano‐Fe3O4 as an effective and reusable catalyst is reported. The present methodology offers several advantages, such as a simple procedure with an easy work‐up, short reaction times, high yields, and the absence of any volatile and hazardous organic solvents.

Regioselective Synthesis of Fused Azo-Linked Pyrazolo[4,3-e]pyridines Using Nano-Fe3O4. -The reaction is conducted under environmentally benign conditions and has an easy work-up procedure. -(NIKPASSAND*, M.; ZARE, L.; SHAFAATI, T.; SHARIATI, S.; Chin. J. Chem. 30 (2012) 3, 604-608, http://dx.doi.org/10.1002/cjoc.201100181 ; Dep. Chem., Islamic Azad Univ., Rasht, Iran; Eng.) -G. Mueller 37-156