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A number of 6-aryl-5,6-dihydrophenanthridines were prepared in good yields via an intramolecular dehydrogenative coupling of biaryl tertiary amines promoted by t-BuOK/DMF. A reaction mechanism involving -aminoalkyl radical intermediates is suggested. N R t-BuOK (3.0 equiv.) DMF,150 °C, 3 h N R Ar1

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Intramolecular dehydrogenative coupling of biaryl tertiary amines promoted with t-BuOK/DMF: A convenient synthesis of 6-aryl-5,6-dihydrophenanthridines