Photoredox and NHC Enabled Deoxygenative Alcohol Homologation via Formal 1,2-Addition

Area of Science:

• Organic Chemistry
• Photocatalysis
• Synthetic Methodology

Background:

• Traditional synthesis of tertiary alcohols often relies on organometallic reagents, which can be hazardous and require specific handling.
• Developing milder and more sustainable synthetic routes is crucial for modern organic chemistry.

Purpose of the Study:

• To develop a highly efficient photoinduced iron-catalyzed method for synthesizing tertiary alcohols.
• To utilize alcohols directly as surrogates for organometallic reagents.
• To explore the compatibility of diverse functional groups under the reaction conditions.

Main Methods:

• Employing a photoinduced, iron-catalyzed reaction system.
• Utilizing primary and secondary alcohols as nucleophilic partners.
• Reacting alcohols with aryl ketones under mild conditions.

Main Results:

• Successful synthesis of tertiary alcohols from a wide range of primary and secondary alcohols and aryl ketones.
• Demonstrated compatibility with various functional groups, including those sensitive to traditional methods.
• Established a mechanism involving the direct addition of a radical to the carbonyl group.

Conclusions:

• The developed method provides an efficient and versatile route to tertiary alcohols.
• This photocatalytic approach offers a sustainable alternative to conventional organometallic-based syntheses.
• The reaction's broad functional group tolerance expands its applicability in complex molecule synthesis.