Regioselective synthesis of polyheterocyclic scaffolds by sequential [3,3] sigmatropic rearrangements and pyridine hydrotribromide mediated heterocyclization
Department of Chemistry, University of Kalyani, Kalyani 741235, W.B. India
Abstract:
A number of tetracyclic polyhetero scaffolds have been regioselectively synthesised in 70‐75% yield from 4‐(3‐aryloxy‐2‐propynyl)oxy]‐6‐methyl‐pyran‐2‐ones via thionation of the lactone carbonyl, sequential Claisen rearrangements and pyridine hydrotribromide mediated heterocyclization.
