Tandem aqueous extract of onion catalyzed Knoevenagel condensation-Michael addition-cyclization: A green synthesis of 2-amino- 3-cyano-4H-pyran derivatives and their anti-oxidant and molecular docking studies
the active methylene compounds and reasonable mechanism for sequential tandemreactions have been described. Also, this methodology has a simple, easy workup, short reaction time, without column chromatography and eco-friendly reaction conditions. Seventeen out of forty-five synthesized pyran derivatives were screened for their in vitro antioxidant studies. Among the compounds 4cd 4cd have shown excellent