Synthesis of imidazopyridines from the Morita-Baylis-Hillman acetates of nitroalkenes and convenient access to Alpidem and Zolpidem

Org Lett. 2012 Sep 7;14(17):4580-3. doi: 10.1021/ol3020418. Epub 2012 Aug 24.

Abstract

A variety of functionalized imidazo[1,2-a]pyridines have been synthesized through a one-pot, room temperature, and reagent-free reaction between MBH acetates of nitroalkenes and 2-aminopyridines. The reaction involves a cascade inter-intramolecular double aza-Michael addition of 2-aminopyridines to MBH acetates. Our methodology is marked by excellent yield, regioselectivity and, above all, adaptability to synthesize imidazopyridine-based drug molecules such as Alpidem and Zolpidem.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetates / chemistry*
  • Alkenes / chemistry*
  • Catalysis
  • Combinatorial Chemistry Techniques
  • Imidazoles / chemical synthesis*
  • Imidazoles / chemistry*
  • Imidazoles / pharmacology
  • Molecular Structure
  • Nitro Compounds / chemistry*
  • Pyridines / chemical synthesis*
  • Pyridines / chemistry*
  • Pyridines / pharmacology
  • Stereoisomerism
  • Zolpidem

Substances

  • Acetates
  • Alkenes
  • Imidazoles
  • Nitro Compounds
  • Pyridines
  • Zolpidem
  • alpidem