4.8 Article

Visible-Light Cascade Photooxygenation of Tetrahydrocarbazoles and Cyclohepta[b]indoles: Access toC,N-Diacyliminium Ions

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 30, Pages 12450-12454

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202007549

Keywords

cascade reactions; indoles; N-acyliminium ions; photooxidation; singlet oxygen

Funding

  1. Deutsche Forschungsgemeinschaft (DFG) [BR 3748/2-2]

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Tetrahydrocarbazoles and perhydrocyclohepta[b]indoles undergo a catalytic cascade singlet oxygenation in alkaline medium, which leads to chiral tricyclic perhydropyrido- and perhydroazepino[1,2-a]indoles in a single operation. These photooxygenation products are new synthetic equivalents of uncommon C,N-diacyliminium ions and can be functionalized with the aid of phosphoric acid organocatalysis.

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