Polymer-supported Phosphinooxathiane as Ligands for Palladium-catalyzed Asymmetric Allylations
摘要:
New polymer-supported chiral ligands, PS-DES, PS-Et, and TentaGel supporting phosphinooxathianes were prepared and used in palladium-catalyzed asymmetric allylic alkylation and amination.
Use of molecular weight-enlarged catalysts in a process for asymmetric, continous hydrogenation, novel molecular weight-enlarged ligands and catalysts
申请人:Degussa-Huels Aktiengesellschaft
公开号:US20020016513A1
公开(公告)日:2002-02-07
The first embodiment of the present invention provides a process, which includes:
in a continuous process in a membrane reactor, asymmetrically hydrogenating at least one C=C, C=N or C=O double bond with a catalyst. Another embodiment of the present invention provides a ligand, which includes at least one di-1,3-aminophosphine homochiral active center; optionally, a linker; and a molecular weight-enlarging polymer; wherein the active center is bound to the molecular weight-enlarging polymer through the linker or is bound directly to the molecular weight-enlarging polymer; and wherein the linker is defined in the claims. Another embodiment of the present invention provides a process for preparing the above-noted ligand, and a catalyst that includes the above-noted ligand.
Verwendung von molekulargewichtsvergrösserten Katalysatoren in einem Verfahren zur Asymmetrischen kontinuerlichen Hydrierung, neue molekulargewichtsvergrösserte Liganden und Katalysatoren
申请人:Degussa AG
公开号:EP1120162A2
公开(公告)日:2001-08-01
Die vorliegende Erfindung richtet sich auf eine Verwendung von molekulargewichtsvergrößerter homogen löslicher Katalysatoren Verfahren zur asymmetrischen kontinuierlichen Hydrierung von C=C-, C=N- oder C=O-Doppelbindungen mittels molekulargewichtsvergrößerter homogen löslicher Katalysatoren in einem Membranreaktor.
Bisherige im Stand der Technik vorgeschlagene Hydrierverfahren liefen diskontinuierlich ab. Die kontinuierliche Fahrweise hilft dagegen Prozeßkosten zu sparen.
Angegeben werden auch neue molekulargewichtsvergrößerte Liganden und Katalysatoren.
Polymer-supported chiral phosphinooxazolidine ligands for palladium-catalyzed asymmetric allylic alkylations and Diels–Alder reactions
作者:Hiroto Nakano、Kouichi Takahashi、Reiko Fujita
DOI:10.1016/j.tetasy.2005.05.017
日期:2005.6
Polymer-supported chiral phosphinooxazolidine (POZ) ligands 9a-c and cationic palladium-POZ catalysts 16a-c have been prepared. The former ligands were used in the Pd-catalyzed asymmetric allylic alkylation, while the latter catalysts were used in the Diets-Alder reaction to afford good to excellent enantioselectivities (Pd-catalyzed allylation: up to 99% ee, Diets-Alder reaction: up to 92% ee). (c) 2005 Published by Elsevier Ltd.
US6759559B2
申请人:——
公开号:US6759559B2
公开(公告)日:2004-07-06
Continuous Application of Chemzymes in a Membrane Reactor: Asymmetric Transfer Hydrogenation of Acetophenone