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Prochirality02:05

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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Chirality in Nature02:30

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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On-line chiral analysis using the kinetic method.

Ryan M Bain1, Xin Yan, Shannon A Raab

  • 1Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA. cooks@purdue.edu.

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|March 17, 2016
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Summary
This summary is machine-generated.

This study introduces a simple mass spectrometry method for chiral analysis of reaction mixtures. The technique accurately measures enantiomeric excess (ee) during reactions and racemization, ensuring product quality.

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Area of Science:

  • Analytical Chemistry
  • Organic Chemistry
  • Mass Spectrometry

Background:

  • Chiral analysis is crucial for pharmaceuticals and fine chemicals.
  • Existing methods for determining enantiomeric excess (ee) can be complex.
  • Solution-phase reaction monitoring requires efficient chiral analysis techniques.

Purpose of the Study:

  • To develop a straightforward method for chiral analysis of solution-phase reaction mixtures.
  • To determine the enantiomeric excess (ee) using tandem mass spectrometry and the kinetic method.
  • To monitor chiral integrity during stereospecific reactions and racemization processes.

Main Methods:

  • Utilizing tandem mass spectrometry with the kinetic method for chiral analysis.
  • Forming chiral cluster ions by diluting reaction aliquots, adjusting pH, and adding reagents.
  • Monitoring the enantiomeric excess (ee) of 2-(3-(2-methoxyethoxy)-5-oxo-1,6-naphthyridin-6(5H)-yl)propanoic acid during synthesis and racemization.
  • On-line monitoring of ibuprofen racemization for real-time ee data.

Main Results:

  • The method successfully determined enantiomeric excess (ee) in solution-phase reaction mixtures.
  • Monitoring of a stereospecific N-selective alkylation product showed expected inversion without ee erosion.
  • Base-catalyzed racemization of the product and ibuprofen demonstrated a decrease in ee over time.
  • On-line monitoring provided near real-time data on enantiomeric excess during racemization.

Conclusions:

  • Tandem mass spectrometry using the kinetic method offers a simple and effective approach for chiral analysis.
  • The developed method accurately tracks enantiomeric excess (ee) during synthesis and racemization.
  • This technique is valuable for real-time process monitoring and quality control in chiral synthesis.