Abstract
AbstractTypical transition metal‐catalyzed oxycyclization of allenols takes place at the terminal allene carbon via a 5‐endo path and forms dihydrofurans. A copper‐catalyzed protocol brought about a reversed regioselectivity, generating a series of trisubstituted epoxides through a 3‐exo‐cyclization/sulfonylation cascade. The current stoichiometry control of regioselectivity may open singular opportunities in chemical transformations.magnified image
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