Dynamic combinatorial libraries of 2,5-diformylfuran-derived macrocycles.

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Chemical Synthesis

Background:

• Dynamic combinatorial chemistry (DCC) is a powerful strategy for synthesizing complex molecules.
• Traditional methods for macrocycle synthesis often involve laborious steps like imine trapping via crystallization.
• Polyazamacrocycles with furan moieties are of interest for various applications.

Purpose of the Study:

• To develop an efficient, all-in-solution method for preparing polyazamacrocycles containing a furan moiety.
• To explore the use of inorganic salt templates in DCC for macrocycle synthesis.
• To investigate the parameters controlling thermodynamic control in templated DCC.

Main Methods:

• Utilized an all-in-solution dynamic combinatorial chemistry approach.
• Employed soluble inorganic salts as templates.
• Incorporated fast imine-to-amine reduction and high-performance liquid chromatography (HPLC) screening.
• Synthesized libraries derived from 2,5-diformylfuran.

Main Results:

• Successfully prepared a series of polyazamacrocycles containing a furan moiety.
• Demonstrated that inorganic salt templates control library behavior and increase isolated yields of macrocyclic amines.
• Achieved higher yields compared to nontemplated libraries.
• Identified key parameters for thermodynamic control, including macrocyclization and imine reduction kinetics.

Conclusions:

• The developed DCC methodology offers an elegant and labor-efficient alternative to classical approaches.
• Inorganic salt templating is effective in enhancing the synthesis of furan-containing polyazamacrocycles.
• Understanding reaction kinetics is crucial for achieving thermodynamic control in these systems.