Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 26, Issue 52, Pages 11974-11978Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202002581
Keywords
cascade reactions; cyclohepta[b]indole; indole[2; 3-d]tropone; photochemistry; ring expansion
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Funding
- TU Dortmund
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We report on the implementation of the concept of a photochemically elicited two-carbon homologation of a pi-donor-pi-acceptor substituted chromophore by triple-bond insertion. Implementing a phenyl connector between the slide-in module and the chromophore enabled the synthesis of cylohepta[b]indole-type building blocks by a metal-free annulative one-pot two-carbon ring expansion of the five-membered chromophore. Post-irradiative structural elaboration provided founding members of the indolo[2,3-d]tropone family of compounds. Control experiments in combination with computational chemistry on this multibond reorganization process founded the basis for a mechanistic hypothesis.
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