Double C-H amination by consecutive SET oxidations.

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• C-H activation and functionalization are crucial in organic synthesis.
• Developing efficient intramolecular C-H amination methods remains a challenge.
• Iron catalysis offers a cost-effective and sustainable alternative to precious metal catalysts.

Purpose of the Study:

• To develop a new method for intramolecular C-H oxidative amination.
• To explore the role of the amino group in the reaction cascade.
• To utilize iron catalysis for efficient C-H bond functionalization.

Main Methods:

• A FeCl3-mediated oxidative reaction of anilines with activated sp(3) C-H bonds.
• Utilizing the amino group as an activating, directing, and trapping group.
• Employing catalytic amounts of iron(III) and inexpensive reagents.

Main Results:

• Successful intramolecular C-H oxidative amination was achieved.
• The amino group demonstrated multiple roles, including activation in single-electron-transfer (SET) oxidation, directing C-H activation, and trapping intermediates.
• The reaction proceeded efficiently with catalytic iron and readily available reagents.

Conclusions:

• A novel and efficient FeCl3-mediated intramolecular C-H oxidative amination method has been established.
• The versatile role of the amino group is key to the reaction's success.
• This methodology offers a cost-effective and sustainable approach to C-H functionalization.