Mild Synthesis of Sterically Congested Alkyl Aryl Ethers

Area of Science:

• Organic Chemistry
• Synthetic Methodology
• Catalysis

Background:

• Tertiary alkyl aryl ethers are important structural motifs in pharmaceuticals and materials.
• Previous methods for synthesizing these compounds often require harsh conditions or transition metal catalysts.
• Developing efficient and metal-free routes remains a significant challenge in organic synthesis.

Purpose of the Study:

• To develop a novel, efficient, and transition-metal-free method for the synthesis of tertiary alkyl aryl ethers.
• To explore the scope and limitations of the developed arylation methodology.
• To demonstrate the applicability of the method in synthesizing complex molecules.

Main Methods:

• Arylation of tertiary alcohols using ortho-substituted diaryliodonium salts.
• Employing a transition-metal-free reaction system.
• Utilizing a range of aliphatic, benzylic, allylic, and propargylic tertiary alcohols, as well as fluorinated alcohols.

Main Results:

• Successful synthesis of sterically hindered tertiary alkyl aryl ethers under mild conditions.
• Broad substrate scope including cyclic and acyclic tertiary alcohols, and fluorinated alcohols.
• Demonstrated versatility through the arylation of the pro-drug mestranol.

Conclusions:

• The developed method provides an efficient and versatile route to sterically demanding tertiary alkyl aryl ethers.
• This transition-metal-free approach offers a greener alternative to existing synthetic strategies.
• The methodology has potential applications in medicinal chemistry and drug discovery.