Abstract
Vinylsulfonamides with a furan, carbocyclic, semicyclic or acyclic 1,3-diene moiety are synthetized via a domino elimination–amidation reaction of 2-chloroethanesulfonyl chloride. Intramolecular Diels–Alder reaction of these vinylsulfonamides with thermal (toluene, 110 °C) or high pressure (dichloromethane, 13 kbar) activation provides efficient access to a range of γ- and δ-sultams following a 2–3 d long synthetic procedure. Enantiopure sultams are readily obtained from N-1-phenylethyl substituted vinylsulfonamides.
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Acknowledgements
Financial support of this work by the Deutsche Forschungsgemeinschaft (grants ME 776/15-2 and 436 RUS 17/90/04), the Russian Foundation for Basic Research (grants 00-03-32812 and 02-03-06577), the Ministry of Science and Education of Russia (grants 15134 and 399) and the Bundesministerium für Bildung und Forschung (grant RUS 02/044) is gratefully acknowledged. We thank Prof. Dr. H. Mayr, Ludwig-Maximilians-Universität München, for samples of dienylamines 1b and 1c, and V.O.R. thanks the Deutsche Akademische Austauschdienst for a research stipend.
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Rogachev, V., Metz, P. Thermal and high pressure intramolecular Diels–Alder reaction of vinylsulfonamides. Nat Protoc 1, 3076–3087 (2006). https://doi.org/10.1038/nprot.2006.463
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DOI: https://doi.org/10.1038/nprot.2006.463
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