Synthesis of sydnone substituted Biginelli derivatives as hyaluronidase inhibitors.

A novel series of Biginelli 2-3 (a and b) and Biginelli-like compounds 4-7 (a and b) were synthesized from 3-aryl-4-formylsydnone 1 (a and b). Since the crystal structure of hyaluronidase was unavailable, the human hyaluronidase protein structure was used as template and homology modeling was performed, validated by Ramachandran plots and subjected to docking studies along with in vitro anti-inflammatory activity assessment against hyaluronidase. Compounds 2-3 (a and b) exhibited potent enzyme inhibition.