Enantioselective Cobalt Catalysis: Precision Construction of C-N Atropisomers
Created on 2025.08.15
A significant advancement in asymmetric catalysis has been achievedby Prof. Basker Sundararaju's team at IIT Kanpur. Their latest JACS publicationdemonstrates how Salox ligands enable unprecedented stereochemical control incobalt-catalyzed reactions.
Evolution of Salox Ligand Technology Salox ligands, first reported by Prof. Carsten Bolm (1991), underwent transformative development in 2022 when Prof. Shi Bingfeng's group pioneered their application in "chirality-controlled catalytic C-H functionalization". Key advantages include:
- Rigid scaffold with proximal chiral centers enabling precise stereodifferentiation
- Facile synthesis and derivatization potential
- Exceptional stability under catalytic conditions
Shi's subsequent research expanded Salox applications to diverse stereochemical frameworks (central/planar/axial chirality) and novel electrochemical/photochemical C-H activation systems (Acc. Chem. Res. 2025, 58, 971).
Sundararaju Group's Methodology Breakthrough The IIT Kanpur team has now leveraged Salox ligands for cobalt-catalyzed construction of C-N atropisomers featuring:
- Room-temperature operation with aerial oxygen as oxidant
- Atom-economic approach for sustainable synthesis
- Broad substrate tolerance across diverse aryl amides and alkynes
- Dual stereocontrol (enantio- and diastereoselectivity)
Key Stereochemical Advantages The optimized Salox ligand system delivers:
- Exceptional enantiocontrol: >99% ee with (S)-L5 ligand
- Diastereodivergence: >20:1 dr with programmable stereochemistry
- Mechanistic versatility:
Publication Details This study opens new possibilities in atroposelective synthesis:
- Title: Cobalt-Catalyzed Enantioselective and Diastereodivergent Construction of C-N Atropisomers
- Authors: Das, Kumaran, Maity, Premkumar & Sundararaju
- Journal: J. Am. Chem. Soc.
- DOI: 10.1021/jacs.5c03776