Phosphonium- and Benzotriazolyloxy-Mediated Bond-Forming Reactions and Their Synthetic Applications

Abstract

Phosphonium and benzotriazolyloxy (and related) intermediates are easily prepared by the reactions of cyclic amides and ureas with (1H-benzotriazol-1-yloxy)triaminophosphonium hexafluorophosphate related reagents. The former intermediates could also be made available using analogous phosphonium reagents prepared in situ or from commercial sources. These intermediates efficiently lead to carbon-nitrogen, carbon-oxygen, carbonsulfur, and carbon-carbon bond formations through nucleophilic aromatic substitution reactions with various nucleophiles. A new reaction involving the generation of phenols in situ from arylboronic acids and oxygen under palladium(0) catalysis or with boronic acids and hydrogen peroxide is reviewed.