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.
AstraZeneca Pharmaceuticals, 1800 Concord Pike, Wilmington, DE 19803 USA
Publication date: April 1, 2013
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