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Paper | Regular issue | Vol 41, No. 4, 1995, pp.765-772
Published online, 1st January, 1970
DOI: 10.3987/COM-94-6984
3-Methyl-1-phenacylbenzotriazolium Yilde : Cycloadditions with Acetylenic Esters and Aldehyde-mediated Dimerization

Alan R. Katritzky, Baozhen Yang, Jinlong Jiang, and Peter J. Steel

*Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, U.S.A.


Stable 3-methyl-1-phenacylbenzotriazolium ylide (2) adds acetylenecarboxylic esters to form tricycles (3). Araldehydes react with two moles of 2 give poly-substituted 4,5-dihydrofurans (5). The pyrazoloquinoxaline structure of 3 was confirmed by X-ray analysis.