Clefts as receptor and enzyme analogues

Area of Science:

• Molecular Recognition and Supramolecular Chemistry
• Synthetic Chemistry and Host-Guest Systems

Background:

• Synthetic receptors are crucial for recognizing small biological targets.
• Understanding molecular recognition principles guides the design of novel synthetic systems.

Purpose of the Study:

• To identify optimal functional groups and molecular scaffolds for synthetic receptors.
• To investigate the role of preorganization and entropic contributions in host-guest interactions.
• To compare the self-association and binding affinities of lactams and imides.

Main Methods:

• Design and synthesis of host molecules using acridine and triaryl benzene scaffolds.
• Utilizing remote steric barriers to control host conformation and preorganization.
• Comparative binding studies of lactams and imides with target molecules, including adenine derivatives.

Main Results:

• Preorganization via remote steric barriers effectively enhances binding affinity by separating entropic and enthalpic contributions.
• Entropy is demonstrated as a significant factor in achieving high affinity.
• Lactams exhibit superior self-association compared to imides, while imides show higher affinity for adenine derivatives due to unconventional hydrogen bonding.

Conclusions:

• Strategic preorganization of synthetic receptors is key to optimizing molecular recognition.
• The study provides insights into the design principles for high-affinity synthetic receptors.
• Demonstrated applications of preorganization in chemical catalysis, including hemiacetal cleavage and self-replication.