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Majumdar K.C.,Kalyani University | Majumdar K.C.,Tezpur University | Ansary I.,Kalyani University | Sinha B.,Kalyani University | And 2 more authors.
Synthesis | Year: 2011

The synthesis of benzoxepine and benzo-2H-pyran derivatives by the implementation of an inxepensive and easy to handle molecular iodine-mediated intramolecular electrophilic cyclization strategy is described. Simple substitution at the terminus of the propargyl group alters the course of the iodocyclization. © Georg Thieme Verlag Stuttgart · New York.

Venkati M.,Osmania University | Reddy S.S.,Osmania University | Swamy G.Y.S.K.,Laboratory of X ray Crystallography | Ravikumar K.,Laboratory of X ray Crystallography | Krupadanam G.L.D.,Osmania University
Arkivoc | Year: 2012

4-Chloro-2-aryl-2H-3-chromenecarbaldehydes 3a-g on reaction with malononitrile in ethanol in the presence of piperidine gave 5-aryl-2-piperidino- 5H-chromeno[3,4-c]pyridine-1-carbonitriles 4a-g in good yields. © ARKAT-USA, Inc.

Majumdar K.C.,Kalyani University | Sinha B.,Kalyani University | Ansary I.,Kalyani University | Ganai S.,Kalyani University | And 3 more authors.
Synthesis (Germany) | Year: 2014

A simple and straightforward approach for the regioselective synthesis of pyranocoumarin and bis-fused benzo-2H-pyran derivatives using mild, easy to handle, and cheaper molecular iodine mediated heterocyclization is described. © Georg Thieme Verlag Stuttgart New York.

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