Tandem Synthesis of Polysubstituted Pyridines via the Indium(III)-Triflate-Catalyzed Cycloaddition/Oxidative Aromatization of Blaise Reaction Intermediates with α,β-Unsaturated Ketones.

2015

In absence of oxygen in the second step, a subsequent oxidation stage is needed to achieve full aromatization of the pyridine ring.

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