A Divergent Route to Eravacycline

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Synthetic Chemistry

Background:

• Eravacycline is a vital tetracycline-class antibiotic.
• Efficient synthesis of complex antibiotics is crucial for drug development.
• Existing synthetic routes may present challenges in scalability or efficiency.

Purpose of the Study:

• To develop a novel convergent synthetic strategy for eravacycline.
• To streamline the construction and deprotection of the eravacycline core structure.
• To establish a practical and potentially scalable method for eravacycline synthesis.

Main Methods:

• Convergent synthesis employing Michael-Dieckmann cyclization.
• Construction of a protected left-hand piece (LHP) from 4-fluoro-3-methylphenol.
• One-pot deprotection strategy involving isoxazole ring opening.

Main Results:

• Successful synthesis of the eravacycline core structure via the developed convergent route.
• A novel one-pot deprotection method was established for isoxazole ring opening and global deprotection.
• The left-hand piece (LHP) was synthesized in six steps, including a palladium-catalyzed phenyl carboxylation.

Conclusions:

• The developed convergent route offers an efficient pathway to eravacycline.
• The one-pot deprotection strategy simplifies the final steps of the synthesis.
• This approach provides a valuable method for the synthesis of eravacycline and related compounds.