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N‐Aryl tetrahydroisoquinolines were oxidised to dihydroisoquinolones through the relay catalysis of a binuclear paddle‐wheel copper complex and a vitamin B1 analogue with oxygen as oxidant. Mechanistic studies revealed that the copper catalyst oxidises amines to the corresponding iminium salts, which are then oxygenated to lactam products by catalysis of the vitamin B1 analogue.
A novel relay catalytic system, consisting of a binuclear copper and a vitamin B1 analogue, allows for the aerobic oxidation of N‐aryltetrahydroisoquinolines to dihydroisoquinolones under mild conditions. Mechanistic studies revealed that the copper catalyst oxidizes amines to the corresponding iminium salts, which are subsequently oxygenated to lactam products by reaction with the vitamin B1 analogue...
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