Asymmetric catalysis based on chiral phospholanes and hydroxyl phospholanes
申请人:The Penn State Research Foundation
公开号:US06727377B2
公开(公告)日:2004-04-27
Chiral phosphine ligands derived from chiral natural products including D-mannitol and tartaric acid. The ligands contain one or more 5-membered phospholane rings with multiple chiral centers, and provide high stereoselectivity in asymmetric reactions.
Modular Synthesis of Chiral N-Protected β-Seleno Amines and Amides via Cleavage of 2-Oxazolidinones and Application in Palladium-Catalyzed Asymmetric Allylic Alkylation
A set of chiral β-seleno amines have been efficiently synthesized via the ring-opening reaction of chiral N-acyl oxazolidin-ones by selenium nucleophiles. These compounds could be transformed into β-seleno amides by reaction with acid chlorides. The present method is applicable to the synthesis of β-chalcogeno amides containing selenium, sulfur and tellurium atoms in good yields. Additionally, these
硒亲核试剂通过手性N-酰基恶唑烷酮的开环反应有效合成了一组手性β-硒胺。这些化合物可以通过与酰氯反应转化为β-硒代酰胺。本方法适用于以良好收率合成含硒、硫和碲原子的β-硫族酰胺。此外,这些新化合物在钯催化的不对称烯丙基烷基化反应中作为配体进行了评估,得到了高达 98% ee 的相应烷基化产物。
Modular bisphosphine ligands: Preparation and application in enantioselective catalytic reactions
作者:Yaşar Gök、İlker Ümit Karayiğit、Halil Zeki Gök
DOI:10.1016/j.jorganchem.2017.05.059
日期:2017.10
C2-symmetric bisphosphine ligands have been synthesized in a straightforward manner through a two-step reaction from the corresponding diols with moderate yields. The applicability of these chiral ligands was evaluated in ruthenium(II)-catalyzed transfer hydrogenation reactions (up to >99% conversion) and palladium(0)-catalyzed enantioselective allylic substitution reactions (up to 70% chemical yield