The Synthesis of 4-Oxo-2-pentenoic Esters by Wittig Reaction Using α-Oxoesters
作者:Paul Francis Schuda、Cynthia B. Ebner、Steven J. Potlock
DOI:10.1055/s-1987-28168
日期:——
The reaction of stabilized ylides with α-oxoesters gives high yields of 4-oxo-2-pentenoic esters. By suitable substitution of each reactant, highly substituted and hindered enones can be prepared in quantity, with excellent geometric selectivity.
Modular 1,1′-Ferrocenediyl-cored <i>P</i>
-Stereogenic Diphosphines: ′′JDayPhos′′ Series and its Use in Rhodium(I)-Catalyzed Hydrogenation
作者:Gašper Poklukar、Michel Stephan、Barbara Mohar
DOI:10.1002/adsc.201800255
日期:2018.7.4
A novel ferrocene‐based P‐stereogenic diphospine ligand series dubbed JDayPhos was developed, which rhodium(I) complexes of some of its members exhibited excellent enantioselectivity (up to >99% ee) and high activity in asymmetric hydrogenation of β‐unsubstituted or ‐substituted itaconates and α‐methylene‐γ‐oxo‐carboxylates.
Inducing Enantioselectivity in a Dynamic Catalyst by Supramolecular Interlocking
作者:Jan Felix Scholtes、Oliver Trapp
DOI:10.1002/anie.201901175
日期:2019.5.6
a supramolecular assembly, where the axial orientation of the biphenyl ligand backbone is governed by the chirality of the amino acid moieties. Stereoinduction during catalysis is decoupled from this process and occurs as an immediate consequence of the emergent behavior of the ligands. This supramolecular system is very robust and has the potential to be adopted for other ligand designs in enantioselective
Tunable furanoside diphosphite ligands. A powerful approach in asymmetric catalysis
作者:Montserrat Diéguez、Aurora Ruiz、Carmen Claver
DOI:10.1039/b303303a
日期:——
series of highly tunable furanoside diphosphite ligands, derived from readilyavailable D-(+)-xylose and D-(+)-glucose, are discussed. Their modular nature allows a facile systematic variation in the configuration of the stereocentres at the ligand bridge and in the biaryl substituents. This enabled to select a ligand for each particular reaction that provided enantioselectivities that are comparable to
一系列高度可调的呋喃糖苷二亚磷酸酯 配体,源于现成的 D -(+)-木糖 和 D -(+)-葡萄糖,进行了讨论。它们的模块性质允许在配体桥和联芳基取代基上的立体中心的构型的容易的系统变化。这样可以选择一个配体 对于每个提供对映选择性与最佳对映选择性相当的特定反应 催化剂 以前在不同的不对称反应中已有报道。
Chiral Diphosphites Derived from <scp>d</scp>-Glucose: New Highly Modular Ligands for the Asymmetric Catalytic Hydrogenation
作者:Montserrat Diéguez、Aurora Ruiz、Carmen Claver
DOI:10.1021/jo0255429
日期:2002.5.1
A series of novel diphosphite ligands derived from readily available D-(+)-glucose have been synthesized. These ligands were screened in the Rh-catalyzed hydrogenation of a series of alpha,beta-unsaturated carboxylic acid derivatives. Both excellent enantioselectivities (ee up to >99%) and activities were achieved. The advantage of these ligands is that their modular nature allows an easy systematic