Stereoselective Iridium-N,P-Catalyzed Double Hydrogenation of Conjugated Enones to Saturated Alcohols
作者:Bram B. C. Peters、Jia Zheng、Suppachai Krajangsri、Pher G. Andersson
DOI:10.1021/jacs.2c02422
日期:2022.5.18
multitude of catalytic systems have been developed for this purpose. However, due to the different nature of the π-system, the hydrogenation of olefins and ketones is normally catalyzed by different metal complexes. Herein, a study on the effect of additives on the Ir-N,P-catalyzed hydrogenation of enones is described. The combination of benzamide and the development of a reactive catalyst unlocked a
A novel family of PNP ligands (W-Phos) was designed and applied in the copper-catalyzed asymmetric addition of linear Grignard reagents to ketones, allowing ready access to versatile chiral tertiary alcohols in high yields and with excellent enantioselectivities.
Asymmetric and Chemoselective Iridium Catalyzed Hydrogenation of Conjugated Unsaturated Oxime Ethers
作者:Shaohu Zhao、Bram B. C. Peters、Haili Zhang、Ruize Xue、Yixin Yang、Liuying Wu、Tianrui Huang、Lei He、Pher G. Andersson、Taigang Zhou
DOI:10.1002/chem.202401333
日期:2024.7.11
The selective hydrogenation of α,β-unsaturated oxime ethers is described. The hydrogenation reaction proceeded smoothly at (20–50 bar) room temperature. The generated chiral oxime ethers showed good isolated yields and excellent enantioselectivity (84 %–99 % yield, >97 % ee). The hydrogenation products could be further hydrolysed to chiral ketones.
Extractive biocatalysis in the asymmetric reduction of α-alkyl, β-aryl enones by Baker’s yeast
作者:Rafaela M. Silva、Laura T. Okano、J. Augusto R. Rodrigues、Giuliano C. Clososki
DOI:10.1016/j.tetasy.2017.05.009
日期:2017.7
We prepared various chiral alpha-alkyl, beta-aryl ketones with good to excellent enantiomeric excess through the Baker's yeast asymmetric double-bond reduction of the corresponding alpha,beta-unsaturated substrates adsorbed onto the resin Amberlite XAD-7. This methodology was compatible with substrates bearing both electron-donating and withdrawing groups attached to the aromatic ring. Elongation of the alpha-alkyl substituent of the starting material strongly affected the reactivity and enantioselectivity of the reaction. (C) 2017 Elsevier Ltd. All rights reserved.