A formal [3 + 3] cycloaddition reaction. 5. An enantioselective intramolecular formal aza-[3 + 3] cycloaddition reaction promoted by chiral amine salts

J Org Chem. 2005 May 27;70(11):4248-56. doi: 10.1021/jo050171s.

Abstract

A detailed account on chiral secondary amine salt promoted enantioselective intramolecular formal aza-[3 + 3] cycloadditions is described here for the first time. The dependence of enantioselectivity on the structural feature of these chiral amines is thoroughly investigated. This study also reveals a very interesting reversal of the stereochemistry in the respective cycloadducts obtained using C(1)- and C(2)-symmetric amine salts. In addition, the influence of solvents, counteranions, and temperatures on the enantioselectivity is described, and a unified mechanistic model based on experimental results as well as semiempirical calculations is proposed.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Amines / chemistry*
  • Catalysis
  • Crystallography, X-Ray
  • Cyclization
  • Heterocyclic Compounds / chemical synthesis*
  • Models, Chemical*
  • Molecular Conformation
  • Molecular Structure
  • Salts / chemistry
  • Stereoisomerism

Substances

  • Amines
  • Heterocyclic Compounds
  • Salts