An Efficient Synthesis of Pyrrolocoumarins and Pyrroloquinolones by Acid-Catalysed Cyclisation of Acetylenic Amines in Water
作者:K. Majumdar、Sudipta Ponra、Somjit Hazra、B. Roy
DOI:10.1055/s-0030-1259990
日期:2011.5
A simple H+-catalysed cyclisation of acetylenic amines for the synthesis of pyrrolocoumarins and pyrroloquinolones under conventional heating or microwave irradiation has been achieved. The reaction requires inexpensive catalyst and simple yet clean reaction conditions and offers potentially bioactive heterocycles in 82-95% yields. pyrrolocoumarin - pyrroloquinolone - Brønsted acid catalysis - intramolecular
Iron/Palladium-Catalyzed Intramolecular Hydroamination: An Expedient Synthesis of Pyrrole-Annulated Coumarin and Quinolone Derivatives
作者:K. Majumdar、Nirupam De、B. Roy
DOI:10.1055/s-0030-1258311
日期:2010.12
A highly efficient intramolecular hydroamination reaction of heterocycle-centered aminoalkynes using both substituted and free amines catalyzed by PdCl2/FeCl3 catalytic system to form the biologically important pyrrolocoumarin and pyrroloquinolone derivatives is reported. The use of both aliphatic and aromatic substituted alkynes with different heterocyclic skleton in this strategy demonstrated the