A Supramolecular Strategy for Enhancing Photochirogenic Performance through Host/Guest Modification: Dicationic...

Area of Science:

• Supramolecular Chemistry
• Photochemistry
• Organic Chemistry

Background:

• Chiral supramolecular interactions are crucial for asymmetric synthesis.
• Photochirogenic reactions offer a pathway to enantiomerically enriched compounds.
• Anthracene derivatives are common photosensitizers and building blocks.

Purpose of the Study:

• To investigate the effect of an additional anionic handle on the photochirogenic performance of anthracene derivatives.
• To compare the performance of 2,6-anthracenedicarboxylate with 2-anthracenecarboxylate in a photochirogenic reaction.
• To optimize the yield and enantiomeric excess of the anti-cyclodimer product.

Main Methods:

• Photoirradiation of 2,6-anthracenedicarboxylate and 2-anthracenecarboxylate in the presence of dicationic gamma-cyclodextrins.
• Spectroscopic analysis to determine product yield and enantiomeric excess.
• Chiral supramolecular complexation to induce asymmetry.

Main Results:

• 2,6-anthracenedicarboxylate demonstrated superior photochirogenic performance compared to 2-anthracenecarboxylate.
• The anti-cyclodimer was obtained in up to 94% yield.
• An enantiomeric excess of -72% was achieved for the anti-cyclodimer.

Conclusions:

• The presence of an additional anionic handle significantly enhances photochirogenic performance.
• Dicationic gamma-cyclodextrins effectively mediate asymmetric induction in anthracene photodimerization.
• 2,6-anthracenedicarboxylate is a promising precursor for efficient photochirogenic synthesis.