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This summary is machine-generated.

We developed efficient methods for synthesizing Q-proline-based, metal-binding macrocycles (QPMs). These macrocycles bind metal ions, transitioning from disordered to ordered structures upon metal addition.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Chemical Biology

Background:

  • Macrocycles are versatile molecular scaffolds with applications in sensing and catalysis.
  • Q-proline-based macrocycles offer unique structural and binding properties.
  • Developing efficient synthetic routes to complex macrocycles remains a challenge.

Purpose of the Study:

  • To introduce efficient synthetic methodologies for Q-proline-based, metal-binding macrocycles (QPMs).
  • To investigate the structural behavior of QPMs in the presence and absence of metal cations.
  • To explore the impact of functional group modifications on macrocycle conformation.

Main Methods:

  • Solid-phase peptide synthesis (SPPS) using Fmoc chemistry.
  • Peptoid synthesis.
  • Nuclear Magnetic Resonance (NMR) spectroscopy.
  • X-ray crystallography.
  • Metal ion titration studies.

Main Results:

  • Efficient synthesis of QPMs with nine functional groups was achieved.
  • Metal-free QPMs exist as disordered structures, confirmed by NMR and X-ray crystallography.
  • Upon metal cation binding, QPMs adopt ordered conformations.
  • Substitution at the hydantoin amide position (R2) induces a conformational change in the proline ring (Cγ-endo to Cγ-exo).

Conclusions:

  • The developed synthetic routes enable facile access to functionalized QPMs.
  • QPMs exhibit metal-dependent structural transitions, highlighting their potential as responsive materials.
  • Steric interactions play a crucial role in dictating macrocycle conformation, offering a handle for structural control.