Enantioselective Synthesis of 3,3-Disubstituted Oxindoles through Pd-Catalyzed Cyanoamidation
摘要:
The first enantioselective cyanoamidation of olefins provides quick access to a variety of 3,3-disubstituted oxindoles. The combination of Pd(dba)(2), an optically active phosphoramidite, and N,N-dimethylpropylene urea (DMPU) in decalin were found to be the best conditions.
Asymmetric Hydrogenation of Ketones Using a Ruthenium(II) Catalyst Containing BINOL-Derived Monodonor Phosphorus-Donor Ligands
作者:Yingjian Xu、Nat W. Alcock、Guy J. Clarkson、Gordon Docherty、Gary Woodward、Martin Wills
DOI:10.1021/ol0481840
日期:2004.10.1
[structure: see text] A series of ruthenium(II) complexes containing BINOL-based monodonor phosphorus ligands have been prepared and applied to the asymmetric catalysis of the hydrogenation of aryl/alkyl ketones. The best ligands for this application are those which contain an aromatic groups with either a methoxide or bromide on the ortho position. Using these ligands, alcohols with ee's of up to
Rhodium-catalyzed enantioselective hydrogenation using chiral monophosphonite ligands
作者:Manfred T Reetz、Thorsten Sell
DOI:10.1016/s0040-4039(00)01099-6
日期:2000.8
Surprisingly high enantioselectivities in the Rh-catalyzed hydrogenation of itaconic acid dimethyl ester and methyl-2-acetamido acrylate are observed upon using chiral monophosphonite ligands derived from binaphthol (ee up to 94%). Although appropriate chelating diphosphonites are more effective, the easy modular synthesis of the chiral monophosphonites may allow for the optimization of a given asymmetric
Chiral phosphonite, phosphite and phosphoramidite η6-arene-ruthenium(ii) complexes: application to the kinetic resolution of allylic alcohols
作者:Mariano A. Fernández-Zúmel、Beatriz Lastra-Barreira、Marcus Scheele、Josefina Díez、Pascale Crochet、José Gimeno
DOI:10.1039/c0dt00140f
日期:——
[RuCl2(η6-arene)(R)-PR(binaphthoxy)}] (arene = benzene (1), p-cymene (2), mesitylene (3); R = Ph (a), OPh (b), piperidyl (c)) are described. Derivatives 1–3 have been employed to promote the kinetic resolution of allylic alcohols through a redox-isomerization process. As a general trend, the best selectivities are attained with the more sterically hindered catalysts i.e. those containing p-cymene or mesitylene ligands
Chiral Phosphorus-Based 1,3-Dipoles: A Modular Approach to Enantioselective 1,3-Dipolar Cycloaddition and Polycyclic 2-Pyrroline Synthesis
作者:Marie S. T. Morin、Bruce A. Arndtsen
DOI:10.1021/ol4035512
日期:2014.2.21
design of a new class of chiral 1,3-dipoles for enantioselective cycloaddition reactions is reported. These phosphorus-based dipoles are easily formed (from imines, acid chlorides, and chiral phosphites), rigidly chiral, and undergo intramolecular alkene cycloaddition with high enantioselectivity. Overall, this provides a straightforward and modular approach to synthesize chiral 2-pyrrolines and pyrrolidines