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The title compounds are prepared by diene reaction between the isopropenylthiolene dioxide (III) and the corresponding quinones.

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Pyridine derivatives with bridges Pyridine derivatives with bridges R 0460Synthesis and Stereochemistry of Some 3-Azabicyclo[3.3.1]nonane Derivatives.-Michael addition of various α,β-unsaturated carbonyl compounds to oxopiperidinecarboxylate (I) provides access to the title azabicyclononane derivatives as diastereomeric mixtures. The structure of adducts is studied in detail using NMR techniques.-(VAFINA, G. F.; YAKHINA, G. R.; KHAKIMOVA, T. V.; SPIRIKHIN, L. V.; GALIN, F. Z.; YUNUSOV, M. S.; Russ.

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