Rhodium-Catalyzed
Tandem Annulation and (5 + 1) Cycloaddition: 3‑Hydroxy-1,4-enyne
as the 5‑Carbon Component
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Abstract
A Rh-catalyzed
tandem annulation and (5 + 1) cycloaddition was
realized. 3-Hydroxy-1,4-enyne served as the new 5-carbon component
for the (5 + 1) cycloaddition.
Substituted carbazoles, dibenzofurans, and tricyclic compounds containing
a cyclohexadienone moiety could be prepared efficiently. The identification
of a byproduct suggests that metal carbene and ketene intermediates
may be involved in the (5 + 1) cycloaddition