Effects of substituent and catalyst on the intramolecular Povarov reaction - Synthesis of chromenonaphthyridines
2-(N-Alkenyl-N-aryl)aminochromone-3-carbaldehyde undergoes intramolecular Povarov reaction with aromatic amines in the presence of Ph3P· HClO4 to produce chromenonaphthyridine. The effects of substituent and catalyst have been studie
Regio- and stereoselective synthesis of 1-benzopyrano[2,3-b]pyrrolo[2,3-d] pyridines: A microwave-accelerated intramolecular [3+2] cycloaddition reaction of azomethine ylide
Figure represented. Regio- and stereoselective syntheses of tetracyclic compounds having chromone, pyrrolidine, and piperidine rings have been accomplished by an intramolecular [3+2] cycloaddition reaction involving azomethine ylide. The reactions were ca
Pericyclic transformations at the periphery of chromen-4-one (=4H-1-benzopyran-4-one): An unusual preference for a 1,5-shift of allylic moieties over the ene reaction
Quite unlike the reported facile ene reactions on the periphery of many related heterocyclic systems, similarly disposed moieties on the periphery of the chromen-4-one (=4H-1-benzopyran-4-one) system fail to undergo an ene reaction and display a rather un
Singh, Gurmit,Singh, Gurpinder,Ishar, Mohan Paul S.
p. 169 - 180
(2007/10/03)
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