Asymmetric syn-selective Henry reaction catalyzed by the sulfonyldiamine-CuCl-pyridine system

J Org Chem. 2008 Jul 4;73(13):4903-6. doi: 10.1021/jo800412x. Epub 2008 May 31.

Abstract

A catalytic asymmetric Henry reaction has been developed with use of a sulfonyldiamine-CuCl complex as a catalyst. A series of new binaphthyl-containing sulfonyldiamine ligands (2a-h) were readily synthesized in two steps starting from commercially available chiral 1,2-diamines. The (R,R)-diamine-(R)-binaphthyl ligand (2d)-CuCl complex smoothly catalyzed the enantioselective Henry reaction with the assistance of pyridine to give the corresponding adduct with high enantiomeric excess (up to 93%). Moreover, the 2d-CuCl-pyridine system promotes the diastereoselective Henry reaction in syn-selective manner to give the adduct in up to 99% yield with 92:8 syn/ anti selectivity. The enantiomeric excess of the syn-adduct was 84% ee.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Copper / chemistry*
  • Molecular Conformation
  • Molecular Structure
  • Pyridines / chemistry*

Substances

  • Pyridines
  • Copper
  • cuprous chloride