Electro-Triggered Cascade Cyclization to Access Phosphinyl-Substituted N-Containing Heterocycles

Area of Science:

• Organic Chemistry
• Electrochemistry
• Catalysis

Background:

• N-heterocycles are crucial scaffolds in medicinal chemistry.
• Organophosphorus compounds are valuable in various chemical applications.
• Developing efficient and sustainable synthetic methods is a key challenge.

Purpose of the Study:

• To develop a novel electro-triggered cascade cyclization strategy.
• To achieve concomitant phosphinylation and N-heterocycle construction.
• To provide an environmentally friendly approach to phosphinyl-substituted N-heterocycles.

Main Methods:

• Utilizing an electro-triggered cascade cyclization.
• Employing anodic oxidation of H-phosphorus compounds to generate P-centered radicals.
• Utilizing cathodic reduction for concurrent molecular hydrogen or methane release.

Main Results:

• Successful synthesis of phosphinyl-substituted N-heterocycles.
• Demonstration of a metal-catalyst-free, oxidant-free, and heating-free protocol.
• Mechanistic insights into radical generation and heterocycle formation.

Conclusions:

• The disclosed protocol offers a simple, clean, and mild method for organophosphorus scaffold synthesis.
• The strategy exhibits broad substrate scope and high atom and step economy.
• This electro-organic approach provides a sustainable alternative for synthesizing valuable heterocycles.