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, carbon-sulfur, 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.
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