A novel and highly efficient gold(III)-complex catalyzed aerobic oxidative α-CâH functionalization of amines has been developed. The tertiary amines can be directly coupled with various nucleophiles using air as a sustainable oxidant.
A catalytic amount of triarylaminium salt is demonstrated to be an efficient initiator for oxidative Mannich reaction of tertiary amines and nonactivated ketones under mild neutral conditions. Air is essential for this reaction and acts as a terminal oxidant. Metal catalysts, acid or base additives, and stoichiometric amounts of chemical oxidants are all avoided in this methodology. Six examples of
A breath of fresh air: The title reaction has been developed for the coupling of amines with nitroalkanes and different unmodified ketones usingair as the sole oxidant under mild reaction conditions. The safe, convenient, and environmentally benign process, as well as the low catalyst loading, short reaction time, and good yields make this protocol very practical (see scheme).
An efficient oxidative Mannich reaction between tertiary amines and unmodified methylketones has been developed, using copper salts as the catalyst and O(2) as the oxidant.