Such chiral phosphine–internal olefin hybrid type ligands as N-1-adamantyl-N-cinnamylaniline derivatives 1 with C(aryl)–N(amine) bond axial chirality were synthesized and utilized for the palladium-catalyzed asymmetric allylicalkylation of indoles to afford the desired products in high enantioselectivities (up to 98% ee).
type phosphine–olefin compounds 1 and found axial chirality in a C(aryl)–N(amide) bond in compounds 1 by HPLC analysis using a chiral stationary phase column. We successfully obtained enantiomeric isomers of 1 and demonstrated the use of (–)-1 for chiral ligands in Pd-catalyzed asymmetric allylic substitution reactions of allylic esters with indoles (up to 97% 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