Abstract
The radical 5-exo cyclization starting from 2-allyloxyphenyldiazonium ions can be employed for the diastereoselective synthesis of ortho-spirocyclohexadienones through a consecutive addition to alkynes. The spirocyclic systems are formed in a radical [2 + 2 + 1] cycloaddition comprising three carbon-carbon formations, of which the final one is an ipso attack onto the aromatic system at the original position of the diazonium-derived aryl radical.
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