Synthesis of styryl-linked fused dihydropyridines by catalyst-free multicomponent reactions
Rahul Yadav1, Tasneem Parvin2, Anoop Kumar Panday3
1Department of Chemistry, National Institute of Technology Patna, Ashok RajPath, Patna, 800 005, India.
Abstract:
Herein, we report a rapid catalyst-free three-component reaction of 2-hydroxy-1,4-naphthoquinone, cinnamaldehydes and 3-aminopyrazoles in ethanol medium under reflux conditions for the easy access of styryl-linked dihydropyridines fused with naphthoquinone and pyrazole moiety. A wide variety of cinnamaldehyde derivatives and 3-aminopyrazoles were found suitable for this three-component reaction. All the products were fully characterized by spectroscopic tools and by recording single crystal XRD of one of the product. Catalyst-free reaction conditions, short reaction time, good yields of the products, easy purification process, formation of three new bonds (Two C-C and one C-N) in one-pot and products having four different bioactive moieties are the notable features of this methodology.
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