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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 67,
  • Issue 4,
  • pp. 365-371
  • (2013)

Vibrational Circular Dichroism (VCD) Chiral Assignment of Atropisomers: Application to γ-Aminobutyric Acid (GABA) Modulators Designed as Potential Anxiolytic Drugs

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Abstract

Atropisomers exist when axial chirality is present as a result of conformationally restricted rotation around a single bond. The interconversion rate of the individual atropisomers is critical to the assessment of chiral stability of a drug throughout scale-up, development, production, and storage as well as in vivo pharmacokinetics. We describe the application of vibrational circular dichroism spectroscopy coupled with quantum mechanics simulations to assign the absolute axial chirality and measure the racemization half-life of a series of potential anxiolytic drugs that act as γ-aminobutyric acid modulators.

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