Dialkyl ether synthesis through heteroatom homolytic substitution.

Radical-based heteroatom homolytic substitution enables efficient synthesis of sterically congested dialkyl ethers, surpassing classical methods with a broad scope of substitution patterns.

• Why it matters: Sterically hindered dialkyl ethers are crucial in bioactive compounds but are difficult to synthesize using traditional nucleophilic substitution due to steric and carbocation stability issues, limiting drug discovery and medicinal chemistry.
• What they did: A titanium-catalyzed, visible-light photoredox approach was developed to generate carbon-centered radicals from carboxylic acid esters, allowing coupling with alcohols across diverse substitution patterns, including highly congested structures.
• The result: This method provides access to previously inaccessible dialkyl ether architectures, including bioisosteres and complex pharmaceutical scaffolds, enabling late-stage diversification and expanding chemical space for drug development.