Practical Synthesis of Axially Chiral Dicarboxylates via Pd-Catalyzed External-CO-Free Carbonylation

Chem Pharm Bull (Tokyo). 2016 Oct 1;64(10):1438-1441. doi: 10.1248/cpb.c16-00486. Epub 2016 Aug 3.

Abstract

We have developed a safe and practical synthetic method for preparing axially chiral diphenyl dicarboxylates using Pd-catalyzed external-CO-free carbonylation with phenyl formate as a CO surrogate. Optimized conditions consisted of axially chiral [1,1'-binaphthalene]-2,2'-diyl ditriflate and its congeners, each easily prepared from commercially available enantiomerically pure diols, Pd(OAc)2, 1,3-bis(diphenylphosphino)propane, ethyldiisopropylamine, and no solvent. To demonstrate the potential utility of these products, this method was conducted on gram-scale and the phenyl ester products were converted to other useful compounds, and both processes were carried out without difficulty.

MeSH terms

  • Carbon Monoxide / chemistry
  • Catalysis
  • Dicarboxylic Acids / chemical synthesis*
  • Dicarboxylic Acids / chemistry
  • Molecular Structure
  • Organometallic Compounds / chemistry*
  • Palladium / chemistry*

Substances

  • Dicarboxylic Acids
  • Organometallic Compounds
  • Palladium
  • Carbon Monoxide