Abstract
Abstract10% Palladium on carbon (10% Pd/C) successfully catalyzed the intramolecular C−H amination of various N‐mesylated 2‐aminobiphenyls in the presence of a catalytic amount of pyridine N‐oxide in heated dimethyl sulfoxide (DMSO) under an oxygen atmosphere to afford the corresponding N‐mesylcarbazoles. The reaction would proceed via a single‐electron transfer process based on its significant suppression by the addition of a single‐electron scavenger, tetracyanoquinodimethane (TCNQ), and the substituents on the aromatic rings of the substrate have an insignificant effect on the reaction progress.magnified image
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