Design, synthesis and characterization of structurally dynamic cyclic N,S-acetals

Area of Science:

• Organic Chemistry
• Medicinal Chemistry

Background:

• Electrophilic auxiliaries are crucial for amine capture and peptide ligation.
• Cyclic N,S-acetals represent a class of compounds with potential applications in synthetic chemistry.

Purpose of the Study:

• To synthesize and characterize a series of electronically perturbed, cyclic N,S-acetals.
• To evaluate the propensity of these N,S-acetal systems to generate zwitterionic intermediates in situ.
• To investigate the dynamic structural properties of these compounds.

Main Methods:

• Synthesis of cyclic N,S-acetals.
• Characterization using spectroscopic and analytical techniques.
• Evaluation of reactivity and stability under varying solvent and pH conditions.

Main Results:

• Successful synthesis and characterization of novel cyclic N,S-acetals.
• Demonstration of in situ zwitterionic intermediate generation.
• Observation of solvent and pH-dependent ring-opening and ring-closing via C1-S bond ionization at room temperature.

Conclusions:

• The studied N,S-acetals exhibit unique, dynamic structural properties.
• These properties are tunable via solvent and pH, offering potential for controlled chemical transformations.
• The ability to generate zwitterionic intermediates in situ opens avenues for new synthetic methodologies.