Stereochemical study on planar-chiral cyclic molecules using polysaccharide-based column chromatography

Area of Science:

• Organic Chemistry
• Stereochemistry
• Chiral Separations

Background:

• Planar chirality is a key stereochemical property in various organic molecules.
• Separating enantiomers of medium-sized ring systems presents significant challenges.
• Previous methods lacked efficiency for obtaining sufficient quantities for detailed studies.

Purpose of the Study:

• To demonstrate the presence of planar chirality in medium-sized heterocycles and nine-membered cyclic systems.
• To develop an effective method for separating and isolating enantiomers of these planar-chiral molecules.
• To enable subsequent in-depth stereochemical investigations.

Main Methods:

• Utilized analytical and preparative high-performance liquid chromatography (HPLC).
• Employed a chiral stationary phase based on polysaccharide selectors.
• Successfully separated enantiomers of planar-chiral heterocycles and cyclic ketones.

Main Results:

• Isolated milligram quantities of enantiomers from diverse medium-sized ring systems.
• Achieved enantioenriched samples suitable for further analysis.
• Confirmed the presence of isolable enantiomers, demonstrating planar chirality.

Conclusions:

• High-performance liquid chromatography with polysaccharide-based chiral stationary phases is effective for separating planar-chiral molecules.
• The developed method facilitates stereochemical studies, including optical activity stability and X-ray crystallography.
• This work expands the accessibility of chiral analysis for complex cyclic organic compounds.