in Wiley Online Library (wileyonlinelibrary.com).Regio-and stereoselective syntheses of tetracyclic compounds having chromone, pyrrolidine, and piperidine rings have been accomplished by an intramolecular [3þ2] cycloaddition reaction involving azomethine ylide. The reactions were carried out thermally as well as by irradiation with microwave. The latter process accelerates the reaction. The selectivities were investigated by density functional theory computation.
Regio-and Stereoselective Synthesis of 1-Benzopyrano[2,3-b]pyrrolo[2,3-d]pyridines: A Microwave-Accelerated Intramolecular [3 + 2] CycloadditionReaction of Azomethine Ylide. -The reaction of the compounds (I) with the compound (II) by heating in toluene gives the product (III) in similar yields but in longer reaction times (25-30 h). -(MAITI, S.; LAKSHMYKANTH, T. M.; PANJA, S. K.; MUKHOPADHYAY, R.; DATTA, A.; BANDYOPADHYAY*, C.; J. Heterocycl. Chem. 48 (2011) 4, 763-768, http://dx.
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