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Computational chemistry reveals that axial substituents are preferred in N-acylpiperidines due to pseudoallylic strain, influencing molecular shape and protein interactions.

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Area of Science:

  • Computational Chemistry
  • Organic Chemistry
  • Structural Biology

Background:

  • Piperidine rings are prevalent in pharmaceuticals and biologically active molecules.
  • Understanding substituent orientation is crucial for predicting molecular properties and interactions.

Purpose of the Study:

  • To investigate the conformational preferences of 2-substituents in phenyl-1-piperidines and N-acylpiperidines using computational methods.
  • To analyze the role of pseudoallylic strain in determining substituent orientation.
  • To correlate computational findings with experimental data from crystallographic databases.

Main Methods:

  • Density functional theory (DFT) calculations using the M06-2X level of theory.
  • Analysis of conformational equilibria between chair and twist-boat forms.
  • Comparison with data from the Cambridge Structural Database and the Protein Data Bank.

Main Results:

  • Axial 2-substituents are modestly favored in phenyl-1-piperidines.
  • Pseudoallylic strain strongly favors axial 2-substituents in N-acylpiperidines (ΔG up to -3.2 kcal/mol).
  • Calculations align well with crystallographic data.
  • The twist-boat conformation of N-acylpiperidines is less favorable by ~1.5 kcal/mol.

Conclusions:

  • Pseudoallylic strain is a key determinant of axial substituent preference in N-acylpiperidines.
  • The resulting three-dimensional molecular shape has implications for protein-ligand binding.
  • Computational modeling provides valuable insights into molecular conformation and its biological relevance.