A General Approach to the Aza-Diketomorpholine Scaffold

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Structural Biology

Background:

• 1,2,4-oxadiazine-3,6-diones represent an underexplored heterocyclic scaffold.
• This scaffold can be viewed as a constrained oxy-azapeptide or aza-diketomorpholine.

Purpose of the Study:

• To develop a stereoconservative synthesis for 1,2,4-oxadiazine-3,6-diones.
• To synthesize enantiopure aza-analogs of diketomorpholine natural products.
• To explore the utility of this scaffold in creating pseudodipeptide analogs.

Main Methods:

• A three-step synthetic methodology was employed.
• The synthesis was applied to create aza-analogs of diketomorpholine natural products.
• Crystallographic analysis was performed to determine the structure of the synthesized compounds.
• Coupling reactions with amino acids were utilized to generate pseudodipeptide analogs.

Main Results:

• A stereoconservative three-step synthesis of 1,2,4-oxadiazine-3,6-diones was successfully developed.
• Enantiopure aza-analogs of diketomorpholine natural products were synthesized.
• The first crystal structures of these compounds were obtained and compared with related heterocycles.
• Original pseudodipeptide analogs were synthesized by coupling the scaffold with amino acids.

Conclusions:

• The developed synthetic route provides efficient access to a valuable heterocyclic scaffold.
• The synthesized compounds represent novel aza-analogs of natural products and pseudodipeptides.
• Structural insights were gained through crystallographic studies.
• The methodology offers a versatile platform for generating diverse chemical entities for potential applications.