Kinetic resolution of racemic alpha-arylalkanoic acids with achiral alcohols via the asymmetric esterification using carboxylic anhydrides and acyl-transfer catalysts

J Am Chem Soc. 2010 Aug 25;132(33):11629-41. doi: 10.1021/ja103490h.

Abstract

A variety of optically active carboxylic esters are produced by the kinetic resolution of racemic alpha-substituted carboxylic acids using achiral alcohols, aromatic or aliphatic carboxylic anhydrides, and chiral acyl-transfer catalysts. The combination of 4-methoxybenzoic anhydride (PMBA) or pivalic anhydride with the modified benzotetramisole-type catalyst ((S)-beta-Np-BTM) is the most effective for promotion of the enantioselective coupling reaction between racemic carboxylic acids and a novel nucleophile, bis(alpha-naphthyl)methanol, to give the corresponding esters with high ee's. This protocol was successfully applied to the production of nonracemic nonsteroidal anti-inflammatory drugs from racemic compounds utilizing the transacylation process to generate the mixed anhydrides from the acid components with the suitable carboxylic anhydrides.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alcohols / chemistry*
  • Anhydrides / chemistry*
  • Carboxylic Acids / chemistry*
  • Catalysis
  • Esters / chemical synthesis*
  • Esters / chemistry
  • Kinetics
  • Molecular Structure
  • Stereoisomerism
  • Tetramisole / analogs & derivatives*
  • Tetramisole / chemistry

Substances

  • Alcohols
  • Anhydrides
  • Carboxylic Acids
  • Esters
  • benzotetramisole
  • Tetramisole