Abstract
A short and efficient method was developed for the synthesis of 2-benzoxepin-3(1<i>H</i>)-ones. The synthetic sequence comprises of initial intermolecular Heck coupling, followed by reduction of the carbonyl functionality of the Heck product and finally base-induced intramolecular condensation. Notably, the final condensation may proceed by an interesting oxy-Michael addition, cycloreversion via double bond isomerization and intramolecular condensation.
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