Dual-Catalytic Structural Isomerisation as a Route to α-Arylated Ketones.

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Isomerisation reactions are crucial for organic synthesis, with positional, geometrical, and stereochemical types being common.
• Structural (constitutional) isomerisation, altering atomic connectivity, is less explored due to challenges in selective bond cleavage and formation.
• Developing catalytic systems for structural isomerisation is essential for accessing complex molecular architectures.

Purpose of the Study:

• To develop a novel catalytic system for the structural isomerisation of allylic alcohols.
• To synthesise challenging α-arylated ketones from readily available starting materials.
• To establish a new retrosynthetic disconnection for complex molecule synthesis.

Main Methods:

• Utilisation of a dual catalytic system comprising a cobalt catalyst and a photocatalyst.
• Employing H-atom transfer initiated semi-pinacol rearrangement.
• Conducting the reaction under reductive, protic conditions.

Main Results:

• Demonstrated successful structural isomerisation of allylic alcohols into α-arylated ketones.
• The dual catalytic system effectively enabled selective bond cleavage and formation.
• The strategy provides an alternative route to motifs difficult to access via direct arylation.

Conclusions:

• The developed dual catalytic system enables efficient structural isomerisation.
• This approach offers a valuable new tool for complex organic synthesis.
• The findings are expected to inspire further advancements in catalytic isomerisation strategies.