An effective method for the construction of the structurally complex fused cyclohepta[ b]indole core has been developed through an intermolecular 1,6-conjugate addition of indoles to 2-alkynyl p-quinone methides followed by an intramolecular electrophilic cyclization under oxophilic and alkynophilic gold catalysis.
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Jadhav et al. (2018) studied this question.
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