Divergent Asymmetric Synthesis of Chiral Spiroheterocycles through Pd-Catalyzed Enantio- and Diastereoselective [3 + 2] Spiroannulation

Org Lett. 2022 Dec 23;24(50):9189-9193. doi: 10.1021/acs.orglett.2c03643. Epub 2022 Dec 12.

Abstract

The palladium-catalyzed divergent asymmetric synthesis of chiral spiro-furanindoline derivatives is described. The zwitterionic alkoxy π-allyl Pd(II) intermediate, generated catalytically from vinyl ethylene carbonate (VEC), could undergo ligand-controlled enantio- and diastereoselective dipolar [3 + 2] spiroannulation with indole-based azadienes to afford the optically active spiro-furanindolines embedding an all-carbon quaternary stereocenter in high yields (up to 99%) with good to excellent stereoselectivities (up to 99% ee and up to >94:6 dr).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Palladium*
  • Stereoisomerism

Substances

  • Palladium