Unlike nitrile oxides, silyl nitronates undergo highly stereoselective intramolecular cycloadditions to produce functionalized carbocyclic or heterocyclic rings.
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Acknowledgement:S upport of this research by Grant 87-00299 from the US-Israel Binational Science Foundation is gratefully acknowleged. We thank Dr. H.E. Gottlieb for valuable help with NMRs pectra.