An alkylation/olefination
cascade of indolecarboxaldehydes and
phosphonate-functionalized donor–acceptor cyclopropanes affords
functionalized dihydrocarbazoles and cyclohepta[
cd
]indoles in formal (3 + 3) and (4 + 3) cycloadditions. A minor modification
to the reaction conditions also allows access to the fully aromatic
heterocyclic scaffolds by thermal loss of an electron-rich aryl moiety.
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