Evidence of the electronic factor for the highly enantioselective catalytic efficiency of Cinchona-derived phase-transfer catalysts

Org Lett. 2005 Mar 17;7(6):1129-31. doi: 10.1021/ol050123u.

Abstract

[structure: see text] The Cinchona alkaloid-derived quaternary ammonium salts containing 2'-N-oxypyridine and 2'-cyanobenzene moieties were prepared and evaluated as phase-transfer catalysts in the enantioselective alkylation of glycine imine ester 1. The N-oxypyridine and cyanobenzene moieties might play an important role to form a rigid conformation by coordinating with H(2)O via hydrogen bonding leading to high enantioselectivity (97 approximately >99% ee), which provides evidence of an electronic factor for the high enantioselective catalytic efficiency in phase-transfer alkylation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkylation
  • Catalysis
  • Cinchona Alkaloids / chemistry*
  • Electrochemistry
  • Molecular Structure
  • Stereoisomerism

Substances

  • Cinchona Alkaloids