Synthesis of gamma-amino esters via Mn-mediated radical addition to chiral gamma-hydrazonoesters

Org Lett. 2009 Mar 5;11(5):1095-8. doi: 10.1021/ol802932v.

Abstract

Highly stereoselective Mn-mediated couplings of alkyl iodides with chiral N-acylhydrazones bearing ester functionality afford a series of gamma-hydrazino esters, including gamma-substituted, alpha,gamma-disubstituted, and alpha,alpha,gamma-trisubstituted examples. In contrast to prior work with chiral N-acylhydrazones, high stereoselectivity was observed even in the absence of Lewis acid. Microwave-assisted acylation with trifluoroacetic anhydride and reductive N-N bond cleavage provided the gamma-amino ester functionality in a synthetically useful N-TFA-protected form.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acids / chemistry*
  • Catalysis
  • Esters
  • Hydrazines / chemical synthesis*
  • Hydrazines / chemistry
  • Hydrazones / chemistry*
  • Hydrocarbons, Iodinated / chemistry*
  • Indium / chemistry
  • Manganese / chemistry*
  • Microwaves
  • Molecular Structure
  • Stereoisomerism

Substances

  • Amino Acids
  • Esters
  • Hydrazines
  • Hydrazones
  • Hydrocarbons, Iodinated
  • Indium
  • indium trichloride
  • Manganese