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Multicomponent Aza-Diels-Alder Synthesis of Phenanthrolines and Pyranoquinolines
K. C. Majumdar*, S. Ponra, D. Ghosh, A. Taher
University of Kalyani, India
16 February 2011 (online)
Reported is the multicomponent reaction of aromatic aldehydes and alkynes with 6-amino coumarins or 6-amino quinolones to give the tricyclic products shown. This reaction is proposed to proceed first through formation of the requisite imine, followed by an aza-Diels-Alder reaction. For optimum yields, a slight excess of the amine and the aldehyde with respect to the alkyne is required.