Enantioselective gold catalyzed dearomative [2+2]-cycloaddition between indoles and allenamides

Chem Commun (Camb). 2015 Feb 11;51(12):2320-3. doi: 10.1039/c4cc08736d.

Abstract

The highly enantioselective synthesis of densely functionalized 2,3-indoline-cyclobutanes by means of chiral gold catalysis is presented. Intermolecular formal [2+2]-cycloaddition reactions between substituted indoles and allenamides enabled direct access to methylenecyclobutane-fused indolines, featuring two consecutive quaternary stereogenic centers with excellent stereochemical control (dr > 20 : 1, ee up to 99%).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amides / chemistry*
  • Catalysis
  • Crystallography, X-Ray
  • Cycloaddition Reaction
  • Gold / chemistry*
  • Indoles / chemistry*
  • Molecular Conformation
  • Stereoisomerism

Substances

  • Amides
  • Indoles
  • Gold