Electrochemically Chemoselective N-C(O) Bond Activation for Amide Esterification.

Area of Science:

• Organic Chemistry
• Electrochemistry
• Synthetic Methodology

Background:

• Amide N-C(O) bond activation is challenging due to resonance stabilization.
• Developing efficient methods for amide functionalization is crucial in organic synthesis.

Purpose of the Study:

• To develop a novel electrochemical method for direct esterification of primary amides.
• To provide a sustainable and efficient protocol for amide activation and modification.

Main Methods:

• Electrochemical direct esterification of primary amides with O-based nucleophiles.
• Utilized tetrabutylammonium bromide (TBAB) as a facilitator.
• Conducted reactions under mild, open-to-air conditions.

Main Results:

• Achieved direct esterification of primary amides with O-based nucleophiles.
• Demonstrated excellent functional group tolerance and applicability in late-stage modification.
• Mechanistic studies revealed in situ N-bromobenzamide formation and hydrogen-bond-assisted nucleophilic attack.

Conclusions:

• The developed electrochemical method provides a practical and scalable alternative for amide activation and esterification.
• This strategy offers a sustainable approach to synthesizing esters from amides.
• The protocol's mild conditions and broad functional group tolerance make it valuable for complex molecule synthesis.