chiral sulfur-containing derivatives were prepared in the diastereoselective nucleophilic additions of thiophenols to the commercially available (1R)-(−)-myrtenal. The newly synthesized 3-phenylsulfanyl derivatives containing an aldehyde functionality were successfully transformed into enantiopure compounds with S, Se and N-donor atoms and applied as chiral ligands in palladium-catalyzed asymmetric allylic
Synthesis of highly modular bis(oxazoline) ligands by Suzuki cross-coupling and evaluation as catalytic ligands
作者:Xavier Cattoën、Miquel A. Pericàs
DOI:10.1016/j.tet.2009.07.053
日期:2009.9
New bis(oxazoline) ligands (BOXs) containing biaryl substitutents at the C-4 position and H or CH2OR substituents at the C-5 position have been synthesized using Suzuki cross-coupling as the main tool for structural diversity. Copper, zinc, and palladium complexes of the prepared BOXs have been evaluated in the following catalytic asymmetric processes: Acylation with kinetic resolution of trans-1,2-cyclohexanediol
Multifunctional chiral aminophosphines for enantiodivergent catalysis in a palladium‐catalyzed allylic alkylation reaction
作者:Sviatoslav S. Eliseenko、Mohan Bhadbhade、Fei Liu
DOI:10.1002/chir.23275
日期:2020.11
Trifunctional MAP‐based chiral phosphines were tested as new ligands in a Pd‐catalyzed asymmetric allylicalkylation, demonstrating fast and enantiodivergent catalysis. The palladium complexes of representative ligands by X‐ray analysis revealed a novel mode of P,N‐coordination of the ligand to the palladium center, which may contribute to switching the sense of the asymmetric induction via combined
functionalization of a readily available norbornene precursor. Palladium catalytic systems containing these new ligands were applied in allylic substitution, and yielded high activities and excellent enantioselectivities for the allylic alkylation and amination reactions (ee up to 97 %). A full coordination analysis of the catalytic precursors including modelling studies was also carried out.