Sequential catalytic isomerization and allylic substitution. Conversion of racemic branched allylic carbonates to enantioenriched allylic substitution products

J Am Chem Soc. 2006 Sep 13;128(36):11770-1. doi: 10.1021/ja0644273.

Abstract

A catalytic protocol for the conversion of readily accessible racemic, branched aromatic allylic esters to branched allylic amines, ethers, and alkyls has been developed. Palladium-catalyzed isomerization of branched allylic esters to terminal allylic esters, followed by sequential iridium-catalyzed allylic substitution, gave the branched allylic products in good yield with high regioisomeric and enantiomeric selectivity. Both electron-rich and electron-poor branched allylic esters gave products in >90% ee. High enantiomeric excesses were also observed for the products from the reactions of 2-thienyl acetates and dienyl carbonates.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Allyl Compounds / chemical synthesis
  • Allyl Compounds / chemistry*
  • Carbonates / chemistry*
  • Carboxylic Acids / chemistry*
  • Catalysis
  • Iridium / chemistry
  • Palladium / chemistry
  • Stereoisomerism

Substances

  • Allyl Compounds
  • Carbonates
  • Carboxylic Acids
  • Iridium
  • Palladium