In-Situ Electrolyte for Electrosynthesis: Scalable Anodically-Enabled One-Pot Sequence from Aldehyde to...

Area of Science:

• Green chemistry and sustainable synthesis.
• Electrochemical organic synthesis.
• Heterocyclic chemistry.

Background:

• Classical redox chemistry often relies on toxic reagents and generates significant waste.
• Electrochemical synthesis typically requires supporting electrolytes, increasing waste.
• Isoxazol(in)es are crucial scaffolds in biologically active molecules.

Purpose of the Study:

• To develop a green, efficient, and waste-minimizing electrochemical method for isoxazol(in)e synthesis.
• To introduce an "in-situ electrolyte" concept for electrosynthesis.
• To achieve transition-metal-free and additive-free conditions.

Main Methods:

• Electrochemical synthesis in an undivided cell using industrial-grade electrodes.
• Aldehyde condensation to oxime followed by anodic oxidation and [3+2] cycloaddition.
• Utilizing salt side-products as the electrolyte for conductivity.

Main Results:

• Facile, one-pot synthesis of isoxazol(in)es from aldehydes.
• Achieved chemical yields up to 97% with good Faradaic efficiency.
• Demonstrated broad substrate scope, scalability, and stability without halogenated solvents or external oxidants.

Conclusions:

• The "in-situ electrolyte" concept enables sustainable and efficient electrochemical preparation of isoxazol(in)es.
• This method offers a greener alternative to traditional redox reactions.
• The protocol is robust, scalable, and applicable to diverse substrates.