A Ruthenium-Catalyzed Cyclization to Dihydrobenzo[ c]phenanthridinone from 7-Azabenzonorbornadienes with Aryl Amides

Org Lett. 2022 Jul 29;24(29):5260-5265. doi: 10.1021/acs.orglett.2c01734. Epub 2022 Jul 15.

Abstract

An efficient ruthenium(II)-catalyzed tandem C-C/C-N bond formation with aryl amides and 7-azabenzonorbornadienes has been developed to synthesize cis-fused dihydrobenzo[c]phenanthridinones. The amide group functions as a directing group as well as a leaving group and provides an easy access to the pharmaceutically useful benzo[c]phenanthridine alkaloids such as nitidine and fagaronine analogues. The present methodology is compatible with various functional groups with respect to azabicyclic alkenes and aromatic amides. The reaction mechanism involving directing-group-assisted C-H activation was proposed and supported by the deuterium labeling studies.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkenes / chemistry
  • Amides / chemistry
  • Catalysis
  • Cyclization
  • Ruthenium* / chemistry

Substances

  • Alkenes
  • Amides
  • Ruthenium