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Remarkably Facile Hexatriene Electrocyclizations as a Route to Functionalized Cyclohexenones via Ring Expansion of Cyclobutenones

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posted on 18.02.2004, 00:00 by Nabi A. Magomedov, Piero L. Ruggiero, Yuchen Tang
This Communication describes a cascade reaction sequence that leads to highly functionalized cyclohexenones starting from reaction of cyclobutenones with α-lithio-α,β-unsaturated sulfones and amides. The hexatriene−cyclohexadiene cyclization steps presumed to be involved in these transformations are among the most facile hexatriene electrocyclizations reported thus far.