Further Improvement on Sulfonamide-Based Ligand for Catalytic Asymmetric 2-Haloallylation and Allylation
摘要:
The sulfonamide-based ligand B was found to exhibit an outstanding crystallinity and perform well as a ligand for Cr-mediated catalytic asymmetric 2-haloallylation and allylation. The new ligand has an appealing advantage over the first generation ligand; its high crystallinity allows effective recovery of the ligand from a reaction in a pure form.
Cobalt-Catalyzed Diastereo- and Enantioselective Reductive Allyl Additions to Aldehydes with Allylic Alcohol Derivatives via Allyl Radical Intermediates
enantioenriched homoallylic alcohols with a remarkably broad scope of allyl groups that can be introduced. Mechanistic studies indicated that allyl radical intermediates were involved in this process. These new discoveries establish a new strategy for development of enantioselective transformations through capture of radicals by chiral Co complexes, pushing forward the frontier of Co complexes for enantioselective