Enantioselective Cobaltaphotoredox-Catalyzed C-H Activation

Area of Science:

• Organic Chemistry
• Catalysis
• Sustainable Synthesis

Background:

• Photocatalysis is a key sustainable strategy in molecular synthesis.
• Asymmetric catalysis has advanced significantly with photocatalysis.
• Enantioselective photoinduced arene C-H activations using cobalt catalysis were previously unexplored.

Purpose of the Study:

• To develop a method for enantioselective dual functionalization of indoles.
• To explore cobalt-catalyzed C-H activation in conjunction with photoredox catalysis.
• To synthesize chiral indolo[2,3-c]isoquinolin-5-ones.

Main Methods:

• Merging organic photoredox catalysis with enantioselective cobalt-catalyzed C-H activation.
• Regio- and stereoselective dual functionalization of indoles.
• Utilizing continuous flow chemistry for C-H activation and annulations.

Main Results:

• Successful enantioselective dual functionalization of indoles.
• Assembly of chiral indolo[2,3-c]isoquinolin-5-ones with up to 99% enantioselectivity.
• Demonstrated robustness of cobaltaphotoredox catalysis in flow chemistry.

Conclusions:

• The developed strategy provides a new route to chiral molecules.
• Cobaltaphotoredox catalysis enables efficient enantioselective C-H activation and annulation.
• Continuous flow synthesis offers straightforward access to complex chiral structures.