Iterative C-H Functionalization Leading to Multiple Amidations of Anilides.

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Polyaminobenzenes are important structural motifs in various chemical applications.
• Efficient synthesis of polyaminobenzenes remains a challenge in organic chemistry.
• C-H functionalization offers a powerful approach for constructing complex molecules.

Purpose of the Study:

• To develop a novel ruthenium-catalyzed method for the synthesis of polyaminobenzenes.
• To explore the iterative C-H amidation of anilides using dioxazolones as an amino source.
• To investigate the mechanism of sequential C-H bond activation and cascade chelation assistance.

Main Methods:

• Ruthenium-catalyzed iterative C-H amidation reactions.
• Utilizing dioxazolones as a readily available amino source.
• Employing cascade chelation assistance for sequential C-H bond activation.
• Performing computational studies to elucidate the reaction mechanism.

Main Results:

• Successful synthesis of polyaminobenzenes through iterative C-H amidation.
• Demonstration of sequential C-H bond activation facilitated by newly installed amide groups.
• Identification of dioxazolones as effective amino sources in this transformation.
• Computational studies provided a mechanistic rationale for the observed reactivity.

Conclusions:

• The developed ruthenium-catalyzed strategy provides an efficient route to polyaminobenzenes.
• The methodology showcases the power of iterative C-H functionalization and cascade chelation assistance.
• This work expands the synthetic toolbox for accessing valuable polyaminobenzene derivatives.