Substituted 1-thia-3-azabutadienes undergo intramolecular [4 + 2] cycloadditions to unactivated carbon–carbon double bonds in high yields.
J. Barluenga, M. Tomás, A. Ballesteros and L. A. López, J. Chem. Soc., Chem. Commun., 1989, 1487 DOI: 10.1039/C39890001487
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