We
report an efficient water mediated, Brønsted acid-catalyzed
rearrangement of alkynyl cyclohexadienones to access meta-olefinated phenols under metal-free conditions. The reaction displayed
excellent substrate scope and yields in water. Synthetic utility of
the protocol was highlighted by carrying out gram scale synthesis,
further functionalizations, and late stage modification. Mechanistic
studies highlighted the key role of water, as the reaction proceeds
via a water addition–elimination sequence on to a vinyl cation
intermediate.
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