Facile Access to Fe(III)-Complexing Cyclic Hydroxamic Acids in a Three-Component Format

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Biochemistry

Background:

• Cyclic hydroxamic acids are effective binders of soluble iron.
• They are analogs of bacterial siderophores, useful in targeted antibiotic delivery.
• Iron overload disease and targeted drug delivery are significant health concerns.

Purpose of the Study:

• To develop a novel synthetic route for cyclic hydroxamic acids.
• To explore their utility in treating iron overload disease.
• To investigate their potential in designing antibiotic constructs.

Main Methods:

• A modified three-component Castagnoli-Cushman reaction was employed.
• Homophthalic acid was cyclodehydrated in situ to its anhydride.
• Hydroxylamine acetate and O-benzylhydroxylamine were used with the reaction in refluxing toluene.

Main Results:

• The protocol enabled multigram-scale synthesis of N-hydroxy- and N-(benzyloxy)tetrahydroisoquinolonic acids.
• The synthesized cyclic hydroxamic acids demonstrated efficient Fe3+ ligand capabilities.
• The modified reaction proved successful due to improved reagent solubility.

Conclusions:

• A versatile synthetic method for cyclic hydroxamic acids was established.
• These compounds are promising candidates for iron overload disease treatment.
• The synthesized molecules hold potential for targeted antibiotic delivery applications.