A practical synthetic approach to chiral α-aryl substituted ethylphosphonates
作者:Natalia S Goulioukina、Tat'yana M Dolgina、Irina P Beletskaya、Jean-Christophe Henry、Damien Lavergne、Virginie Ratovelomanana-Vidal、Jean-Pierre Genet
DOI:10.1016/s0957-4166(01)00031-3
日期:2001.2
A convenientgeneral method is reported for the synthesis of α-aryl substituted ethylphosphonic acids and esters by hydrogenation of α-aryl substituted ethenylphosphonic acids and esters. Racemic α-arylethylphosphonic acids and esters were prepared in 70–88% yield under palladium-assisted transferhydrogenation conditions using ammonium formate. Asymmetric hydrogenation of α-arylethenylphosphonic acids
The first asymmetrichydrogenation of vinylphosphonic acids and esters to the corresponding arylethylphosphonic acids and esters using chiralRu(II) catalysts is reported with enantiomeric excesses up to 86%.
Enantioselective Synthesis of Chiral α-Aryl or α-Alkyl Substituted Ethylphosphonates via Rh-Catalyzed Asymmetric Hydrogenation with a <i>P</i>-Stereogenic BoPhoz-Type Ligand
An enantioselective synthesis of optically active 1-aryl or 1-alkyl substituted ethylphosphonates, based on the first Rh-catalyzed asymmetric hydrogenation of corresponding alpha,beta-unsaturated precursors with a P-stereogenic BoPhoz-type ligand under the mild condition, was developed, in which a wide range of 1-aryl or 1-alkyl substituted ethylphosphonates were achieved in up to 98% ee.
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作者:N. S. Gulyukina、T. M. Dolgina、G. N. Bondarenko、I. P. Beletskaya、N. A. Bondarenko、J. -C. Henry、D. Lavergne、V. Ratovelomanana-Vidal、J. -P. Genet
DOI:10.1023/a:1016511609369
日期:——
A convenient and inexpensive general preparation method for 1-arylethylphosphonic acids and their esters was developed involving in reduction of the corresponding 1-ethenylphosphonates by ammonium formate in the presence of palladium on carbon. A homogeneous enantioselective hydrogenation of 1-arylethenylphosphonic acids in the presence of chiral ruthenium catalysts provided optically active 1-arylethylphosphonic acids of enantiomeric purity up to 86%. The preliminary data on biological activity testing of the 1-arylethylphosphoic acids synthesized evidence that some among the compounds obtained are low-toxic substances with the properties of immunosuppressors of the central type of action.
Rh(I)-Catalyzed Enantioselective Hydrogenation of α-Substituted Ethenylphosphonic Acids
作者:Kaiwu Dong、Zheng Wang、Kuiling Ding
DOI:10.1021/ja305780z
日期:2012.8.1
A class of chiral Rh(I) catalysts containing monodentate phosphorous aciddiesters tautomerized from the corresponding secondary phosphine oxides was discovered by serendipitous hydrolysis of phosphoramidite ligands. The evolved catalysts demonstrated unprecedented enantioselectivities (98-99% ee) and high catalytic activities (as low as 0.01 mol% catalyst loading) in asymmetric hydrogenations of a