Total Synthesis of Aetheramide A

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Natural Product Synthesis

Background:

• Aetheramide A is a potent natural product with anti-HIV activity.
• Its complex structure presents a significant synthetic challenge.
• The absolute configuration at C26 was previously undetermined.

Purpose of the Study:

• To achieve the first total synthesis of aetheramide A.
• To establish the unknown stereochemical configuration at C26.
• To develop novel synthetic methodologies for complex natural products.

Main Methods:

• An 18-step synthetic route was designed starting from four complex building blocks.
• A configurationally labile β-ketoester moiety was employed to control stereochemistry at a methyl branch.
• A pivotal macrolactamization was accomplished via trapping a thermally generated acylketene derived from a dioxinone.

Main Results:

• The first total synthesis of aetheramide A was successfully completed.
• The unknown configuration at C26 was definitively established.
• A novel strategy for macrolactamization using acylketene intermediates was demonstrated.

Conclusions:

• The total synthesis provides access to aetheramide A for further biological evaluation.
• The synthetic strategy highlights the utility of labile intermediates for stereochemical control.
• This work expands the toolkit for the synthesis of complex macrocyclic natural products.