BF3·OEt2-Mediated 1,3-Hydride Shift Followed by 6π Electrocyclization: An Efficient Route for the Synthesis of Pyridopyrimidine, Pyranoquinoline, and Phenanthroline Derivatives
作者:Krishna C. Majumdar、Sudipta Ponra、Raj Kumar Nandi
DOI:10.1002/ejoc.201101065
日期:2011.12
The synthesis of pyridopyrimidine, pyranoquinoline, and phenanthrolinederivatives can be easily and efficiently accomplished by the direct reaction of a 1-aminopenta-1,4-diene fragment, an aromatic aldehyde, and BF 3 ·OEt 2 in the absence of any metal catalyst. The notable features of this procedure are mild reaction conditions, good to high yields, and operational simplicity.
Indium(III) Chloride Catalyzed Convergent, Regioselective Synthesis of Annulated Quinoline and Pyridine Derivatives
作者:K. Majumdar、Raj Nandi、Sudipta Ponra
DOI:10.1055/s-0031-1290100
日期:2012.1
A direct convergent two-component regioselective synthesis of annulated pyridine motif from 1-aminopenta-1,4-diene fragment and aromatic aldehyde by indium(III) chloride catalyzed reaction has been developed through a concerted pathway. A series of potentially bioactive pyranoquinoline, phenanthroline, and pyridopyrimidine derivatives has been synthesized in high yields by this protocol.