Electrochemical Oxygen-Atom Transfer to Alkenes and Pyridines with a Mn-Porphyrin Catalyst Using Water as the Source...

Area of Science:

• Catalysis
• Electrochemistry
• Organic Synthesis

Background:

• Oxygen-atom transfer (OAT) reactions like epoxidation commonly rely on hazardous, high-energy chemical oxidants.
• Stoichiometric oxidants pose safety risks and scalability challenges in industrial applications.
• Electrochemical methods offer a sustainable alternative, utilizing water as the oxygen donor.

Purpose of the Study:

• To develop a safe and efficient electrochemical method for OAT reactions.
• To identify a novel electrocatalyst capable of mediating OAT using water.
• To demonstrate the applicability of this method for synthesizing epoxides and N-oxides.

Main Methods:

• An electron-deficient manganese-porphyrin electrocatalyst was synthesized and characterized.
• Electrochemical oxidation was employed using water as the oxygen source.
• The catalyst's performance was evaluated for OAT to various alkenes and pyridines.

Main Results:

• The Mn-porphyrin electrocatalyst efficiently mediated OAT reactions, producing epoxides and N-oxides.
• The scope included challenging terminal and electron-deficient alkenes.
• Electrochemical oxidation demonstrated superior performance compared to chemical oxidation methods.

Conclusions:

• An efficient and safe electrochemical OAT method was established using a Mn-porphyrin catalyst and water.
• This approach provides a scalable and sustainable alternative to traditional chemical oxidants.
• The method shows promise for the synthesis of valuable chemical products, including pharmaceutical intermediates.