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Communication | Regular issue | Vol 45, No. 9, 1997, pp.1651-1655
Published online, 1st January, 1970
DOI: 10.3987/COM-97-7860
1,3-Dipolar Cycloaddition of 3-Arylidenechromanone -1-thiochromanone and -flavanone: Regio- and Stereoselective Formation of Spiroheterocycles

L'ubor Fisera,* Libuse Jarosková, Albert Lévai, Eva Jedlovská, Gábor Tóth, and Monika Poláková

*Department of Organic Chemistry, Slovak University of Technology, SK-812 37 Bratislava, Slovakia


The cycloaddition of nitrile oxides, nitrones, and nitrile imines to 3-arylidenechromanone (1), -flavonone (5), -1-thiochromanone (2) and -1-tetralone (3) proceeds regio- and stereoselectively under the formation of spiro-substituted isoxazole and pyrazole derivatives.