Enantioselective Hydrogenation of β-Keto Esters using Chiral Diphosphine-Ruthenium Complexes: Optimization for Academic and Industrial Purposes and Synthetic Applications
作者:V. Ratovelomanana-Vidal、C. Girard、R. Touati、J. P. Tranchier、B. Ben Hassine、J. P. Genêt
DOI:10.1002/adsc.200390021
日期:2003.1
Enantioselectivehydrogenationusingchiralcomplexes between atropisomeric diphosphines and ruthenium is a powerful tool for producing chiral compounds. Using a simple and straightforward in situ catalyst preparation, the conditions were optimizedusing molecular hydrogen for both academic and industrialpurposes. This led to the best conditions and the lowest catalytic ratio required for the pressure
Lewis Base Activation of Lewis Acids: Catalytic, Enantioselective Addition of Silyl Ketene Acetals to Aldehydes
作者:Scott E. Denmark、Gregory L. Beutner、Thomas Wynn、Martin D. Eastgate
DOI:10.1021/ja047339w
日期:2005.3.1
The concept of Lewisbase activation of Lewisacids has been reduced to practice for catalysis of the aldolreaction of silyl ketene acetals and silyl dienol ethers with aldehydes. The weakly acidic species, silicon tetrachloride (SiCl4), can be activated by binding of a strongly Lewis basic chiral phosphoramide, leading to in situ formation of a chiral Lewisacid. This species has proven to be a competent
decarboxylative aldol reaction between malonic acid half-oxyesters and various carbonyls with carboxylate assistance was developed, affording structurally diverse β-hydroxy esters with good yields and enantioselectivities under mild conditions. Importantly, the broad substrate scope of this methodology enabled rapid accesses to several natural products and their analogues as exemplified by phenylpropanoid, phaitanthrin
Ir-catalyzed asymmetric hydrogenation of β-keto esters with chiral ferrocenyl P,N,N-ligands
作者:Xiu-Shuai Chen、Chuan-Jin Hou、Chao Qin、Hongzhu Liu、Yan-Jun Liu、De-Zhi Huang、Xiang-Ping Hu
DOI:10.1039/c7ra00472a
日期:——
The Ir-catalyzed asymmetrichydrogenation of β-keto esters with chiralferrocenylP,N,N-ligands has been developed. Under the optimized conditions, a wide range of β-keto esters were hydrogenated to afford the corresponding β-hydroxy esters in good to excellent enantioselectivities (up to 95% ee).
Iridium-catalyzed asymmetric hydrogenation of <font>β</font>-keto esters with f-amphox ligands
作者:Chao Qin、Xiu-Shuai Chen、Chuan-Jin Hou、Hongzhu Liu、Yan-Jun Liu、De-Zhi Huang、Xiang-Ping Hu
DOI:10.1080/00397911.2017.1414267
日期:2018.3.19
ABSTRACT The iridium-catalyzed asymmetric hydrogenation of β-keto esters with chiral tridentate P,N,N-ligands (f-amphox) has been developed. Under the optimized conditions, a wide range of β-keto esters can be hydrogenated smoothly, affording the corresponding β-hydroxy esters in good to excellent enantioselectivities (up to 95% ee). GRAPHICAL ABSTRACT