Naplephos: a modular library of chiral phosphines based on d-glucose for highly enantioselective asymmetric catalysis
摘要:
Simple functionalisation of N-acetylglucosamine produces the modular ligand library naplephos, which combines the performance of 'privileged' ligands based on 1,2-trans-cyclohexanediamine with flexibility and accessibility. With the proper choice of substituents, the basic structure was suitably adapted to the Pd-catalysed asymmetric allylic alkylation of rac-(E)-1,3-dipheny1-2-propenyl acetate with dimethyl malonate, producing the (S)-product in ee's of up to 96% ee. (C) 2010 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Asymmetric Allylic Alkylation Using Phosphine-Amide Derived from Chiral trans-2-Aminocyclohexanol
摘要:
A novel phosphine-amide derived from resolved trans-2-aminocyclohexanol has been synthesized and studied in palladium-catalyzed asymmetric allylic alkylation of racemic (E)-1,3-diphenyl-2-propenyl acetate with various nucleophiles.