作者:Pierre-Alain R. Breuil、Frederic W. Patureau、Joost N. H. Reek
DOI:10.1002/anie.200806177
日期:2009.3.9
catalysts! A single hydrogen bond between ligands coordinated to a rhodium center is critical for the formation of pure supramolecular catalysts for asymmetric hydrogenationreactions. The ester group of the amidite ligand (see scheme) also forms a hydrogen bond with the coordinated substrate. Use of the heterocomplex afforded the highest enantioselectivity reported to date for the hydrogenation of several
Synthesis and application in asymmetric C–C bond formation of solution phase ligand libraries of monodentate phosphoramidites
作者:Ate Duursma、Laurent Lefort、Jeroen A. F. Boogers、André H. M. de Vries、Johannes G. de Vries、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1039/b404996a
日期:——
A library of 96 unique monodentate phosphoramidite ligands has been synthesized in solution and used in the asymmetric conjugate addition of potassium vinyltrifluoroborate to enones resulting in up to 88% ee.
Highly Enantioselective Conjugate Additions of Potassium Organotrifluoroborates to Enones by Use of Monodentate Phosphoramidite Ligands
作者:Ate Duursma、Jean-Guy Boiteau、Laurent Lefort、Jeroen A. F. Boogers、André H. M. de Vries、Johannes G. de Vries、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/jo0487810
日期:2004.11.1
rhodium-catalyzed asymmetric conjugate addition of potassium organotrifluoroborates to various enones in the absence of water is described. A systematic search for effective catalysts has been performed by use of high-throughput screening methods. Initially, we have screened reaction conditions, catalyst precursors, and focused ligand libraries. In the next stage we have used the monodentate ligand combination
Catalytic Asymmetric Alkynylation and Arylation of Aldehydes by an H
<sub>8</sub>
‐Binaphthyl‐Based Amino Alcohol Ligand
作者:Jiwu Ruan、Gui Lu、Lijing Xu、Yue‐Ming Li、Albert S. C. Chan
DOI:10.1002/adsc.200700215
日期:2008.1.4
prepared in situ) to aldehydes, yielding the corresponding optically active propargylic alcohols and diarylmethanols in high yields and good to excellent enantioselectivities. For the asymmetricarylation reaction, one catalyst (1Ra,2S,3R)-2 can afford both enantiomers of many pharmaceutically interesting diarylmethanols by a proper combination of various arylzinc reagents and aldehydes.
合成了一种新型的手性H 8 -1,1'-联萘基氨基醇配体(1 R a,2 S,3 R)-2,并用于有机锌的直接亲核加成(炔基锌和芳基锌原位制备)生成醛类,以高收率和良好至优异的对映选择性产生相应的旋光炔丙醇和二芳基甲醇。对于不对称芳基化反应,一种催化剂(1 R a,2 S,3 R)-2 通过适当地组合各种芳基锌试剂和醛,可以提供许多药学上感兴趣的二芳基甲醇的两种对映异构体。
Instant Ligand Libraries. Parallel Synthesis of Monodentate Phosphoramidites and in Situ Screening in Asymmetric Hydrogenation
作者:Laurent Lefort、Jeroen A. F. Boogers、André H. M. de Vries、Johannes G. de Vries
DOI:10.1021/ol049510e
日期:2004.5.1
identified as excellent ligands for various metal-catalyzed enantioselective transformations. Taking advantage of their easy preparation and modular nature, we designed a fully automated protocol for the parallel preparation of a library of 32 phosphoramidites and its screening in asymmetric hydrogenation of amino acid precursors. This initial study led to the discovery of a new ligand for the preparation