Carbene‐Catalyzed Enantioselective Hydrophosphination of α‐Bromoenals to Prepare Phosphine‐Containing Chiral Molecules
作者:Rakesh Maiti、Jia‐Lei Yan、Xing Yang、Bivas Mondal、Jun Xu、Huifang Chai、Zhichao Jin、Yonggui Robin Chi
DOI:10.1002/anie.202112860
日期:2021.12.13
AbstractDisclosed herein is the first carbene‐organocatalyzed asymmetric addition of phosphine nucleophiles to the in situ generated α,β‐unsaturated acyl azolium intermediates. Our reaction enantioselectively constructs carbon–phosphine bonds and prepares chiral phosphines with high optical purities. The phosphine products are suitable for transforming to chiral ligands or catalysts with applications in asymmetric catalysis. The diarylalkyl or trialkyl phosphine products from our catalytic reactions, air‐sensitive and reactive in nature, can be trapped (and stored) in their sulfur‐oxidized form for operational simplicities.
Kinetic Resolution in Palladium-Catalyzed Asymmetric Allylic Alkylations by a P,O Ligand System
作者:Scott R. Gilbertson、Ping Lan
DOI:10.1021/ol0161256
日期:2001.7.1
[GRAPHICS]Through the investigation of peptide-based phosphine oxazoline ligands, a simple P,O ligand system was developed. This system provides palladium complexes that are capable of a very high degree of kinetic resolution of 1,3-diphenylprop-2-enyl acetate. The isolated palladium complex was synthesized, characterized, and determined to be an effective procatalyst.