that N-(tert-butyl)-N-methylanilines 1 have C(aryl)–N(amine) bond axial chirality and succeeded the optical resolution of C–N bond atropisomers of amines 1 by a chiral palladium resolving agent and/or a chiral HPLC method. Finally, we demonstrated the ability of chiral amines 1 as a ligand in palladium-catalyzedasymmetricallylicalkylation of allylic esters with malonates (up to 95% ee).
Acyclicamines 1 were obtained by a nucleophilic aromatic substitution (SNAr) reaction and N-methylation followed by silane reduction. The optical resolution of C(aryl)–N(amine) bond atropisomers of amines 1 is described. We found that chiral acyclicamine 1a can be resolved by crystallization without any outside chiral source. Finally, we demonstrate the ability of chiral amines 1 as a ligand in a
Enantioselective C3‐Allylation of Pyridines via Tandem Borane and Palladium Catalysis
作者:Jun‐Jie Tian、Rui‐Rui Li、Gui‐Xiu Tian、Xiao‐Chen Wang
DOI:10.1002/anie.202307697
日期:2023.8.21
A one-pot, three-step method for highly enantioselective C3-allylation reactions of pyridines was developed. The method involved borane-catalyzed dearomative pyridine hydroboration, palladium-catalyzed enantioselective allylation of the dearomatized intermediate, and finally oxidation by air. The method was applicable to a broad range of pyridines, N-heteroarenes, and allylic esters.