A new entry into cis-3-amino-2-methylpyrrolidines via ring expansion of 2-(2-hydroxyethyl)-3-methylaziridines

Org Biomol Chem. 2009 Jan 7;7(1):135-41. doi: 10.1039/b816617j. Epub 2008 Nov 6.

Abstract

3-Amino-2-methylpyrrolidines were prepared via a novel protocol, involving the reductive ring closure and O-deprotection of gamma-acetoxy-alpha-chloroketimines towards 2-(2-hydroxyethyl)-3-methylaziridines, followed by ring expansion of the latter into 3-bromopyrrolidines via intermediate bicyclic aziridinium salts and consecutive nucleophilic displacement of the bromo atom by azide towards 3-azidopyrrolidines. A final reduction of the azide moiety furnished 3-amino-2-methylpyrrolidines in high yields. Thus, a new formal synthesis of the antipsychotic emonapride was developed through preparation and further aroylation of cis-3-amino-1-benzyl-2-methylpyrrolidine.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antipsychotic Agents / chemical synthesis*
  • Antipsychotic Agents / chemistry
  • Aziridines / chemical synthesis*
  • Aziridines / chemistry*
  • Benzamides / chemical synthesis*
  • Benzamides / chemistry
  • Chemistry, Organic / methods*
  • Chemistry, Pharmaceutical / methods
  • Drug Design
  • Magnetic Resonance Spectroscopy
  • Models, Chemical
  • Molecular Conformation
  • Molecular Structure
  • Pyrrolidines / chemistry*
  • Stereoisomerism

Substances

  • Antipsychotic Agents
  • Aziridines
  • Benzamides
  • Pyrrolidines
  • nemonapride