Divergent synthesis of bis(indolyl)methanes via FeIII-catalysed regioselective dehydrogenative coupling reactions: a biomimetic approach to 6,6'-bis-(debromo)-gelliusine F.

The divergent dehydrogenative coupling reactions of tryptamines with the catalysis of nontoxic FeIII salts in the presence of DDQ as the co-oxidant have been developed. Remarkably, the transformations feature a rapid and regioselective assembly of diverse 2,8'- and N1,8'-bis(indolyl) methane derivatives from readily-available starting materials by simply changing the FeIII salt and reaction temperature. Besides, the fast reaction rate, mild reaction conditions, low catalyst cost and easy operations make this methodology quite useful. The synthetic utility was further demonstrated in the biomimetic synthesis of 6,6'-bis-(debromo)-gelliusine F.