Synthesis of π-extended dibenzo[d,k]ullazines by a palladium-catalyzed double annulation using aryne

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An efficient Pd-catalyzed double annulation reaction of 1-(2,6-dibromophenyl)-1H-pyrroles with arynes is developed to synthesize π-extended dibenzo[d,k]ullazines in good to excellent yields. For the first time, the parent dibenzo[d,k]ullazine core is obtained and characterized.
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