Visible-Light-Mediated Charge Transfer Enables C-C Bond Formation with Traceless Acceptor Groups

Area of Science:

• Organic Chemistry
• Photochemistry
• Synthetic Methodology

Background:

• Carbon-carbon (C-C) bond formation is fundamental in organic synthesis.
• Photochemical reactions offer sustainable alternatives to traditional methods.
• Developing efficient and traceless functionalization strategies is crucial.

Purpose of the Study:

• To develop and apply traceless acceptor groups for photochemical C-C bond formation.
• To enable alkylation of diverse substrates using visible light.
• To investigate the mechanism involving electron donor-acceptor (EDA) complexes.

Main Methods:

• Photoexcitation of electron donor-acceptor (EDA) complexes with visible light.
• Preparation of traceless acceptors from amino acid and peptide feedstocks.
• Alkylation of heteroarene and enamine donors.
• Combined experimental and computational studies to elucidate reaction mechanisms.

Main Results:

• Successful development of traceless acceptor groups for photochemical C-C bond formation.
• Demonstrated efficient alkylation of a wide range of heteroarene and enamine donors.
• Established a metal- and peroxide-free synthetic protocol.
• Elucidated the critical role of EDA complexes in the reaction mechanism.

Conclusions:

• Traceless acceptor groups provide a versatile platform for visible-light-mediated C-C bond formation.
• The developed methodology offers a sustainable and efficient approach for alkylating various organic substrates.
• Understanding the EDA complex mechanism is key to optimizing these photochemical transformations.