This reaction allows aryl carbon-heteroatom bond formation via an oxidative coupling of arylboronic acids, stannanes or siloxanes with N-H or O-H containing compounds in air. Substrates include phenols, amines, anilines, amides, imides, ureas, carbamates, and sulfonamides. The reaction is induced by a stoichiometric amount of copper(II) or a catalytic amount of copper catalyst which is reoxidized by atmospheric oxygen.
The Chan-Lam Coupling may be conducted at room temperature in air, which gives it a certain advantage over the Buchwald-Hartwig Cross Coupling.
Mechanism of the Chan-Lam Coupling
The reaction with a stoichiometric amount of copper(II) is also facilitated by oxygen, because reductive elimination from a copper(III) species is faster.
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