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[Nitrogen pyramidal amides and related compounds].

T Ohwada1

  • 1Faculty of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603 Japan.

Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
|February 24, 2001
PubMed
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Non-planar amide bonds, specifically pyramidalized nitrogen in 7-azabicyclo[2.2.1]heptane amides, challenge the assumed planarity essential for protein folding and biological functions.

Area of Science:

  • Organic Chemistry
  • Structural Biology
  • Biochemistry

Context:

  • Amide bonds are fundamental to peptides and proteins, with their planarity crucial for protein folding and biological processes.
  • The rigid planarity arises from conjugation between carbonyl and amine groups.
  • Investigating non-planar amides in the ground state is key to understanding the significance of amide planarity.

Purpose:

  • To investigate the structural and electronic properties of amides derived from the 7-azabicyclo[2.2.1]heptane motif.
  • To determine if nitrogen pyramidalization is an intrinsic feature of this bicyclic system.
  • To explore the implications of nitrogen pyramidalization on amide bond rotation and potential applications.

Summary:

  • Simple amides of 7-azabicyclo[2.2.1]heptane, including N-benzoyl derivatives, exhibit nitrogen-pyramidal geometry in the crystalline state.

Related Experiment Videos

  • This pyramidalization appears to be an intrinsic characteristic of the 7-azabicyclo[2.2.1]heptane scaffold.
  • Lower rotational barriers around the amide C-N bond in these compounds suggest pyramidalization may persist in solution, unlike in monocyclic amides.

    • Impact:

    • Challenges the long-held assumption of inherent amide bond planarity in biological systems.
    • Suggests that pyramidalized amide nitrogen is a general feature of the 7-azabicyclo[2.2.1]heptane motif.
    • Highlights the potential for modifying the 7-azabicyclo[2.2.1]heptane system to create novel pharmacophores from sulfonamides and N-nitrosoamines.