the amine nitrogen atom were prepared and evaluated in the asymmetrictransfer hydrogenation of ketones. Bidentate and tridentate ligands demonstrated a mutual exclusivity directly related to their function as catalysts. A broad series of ketones were reduced with these new catalysts, permitting the ready identification of an optimal catalyst for each substrate and revealing the subtle effects that changes
Stereogenic <i>cis</i>-2-substituted-<i>N</i>-acetyl-3-hydroxy-indolines <i>via</i> ruthenium(<scp>ii</scp>)-catalyzed dynamic kinetic resolution-asymmetric transfer hydrogenation
作者:Zhonghua Luo、Guodong Sun、Zihong Zhou、Guozhu Liu、Baolei Luan、Yicao Lin、Lei Zhang、Zhongqing Wang
DOI:10.1039/c8cc07336h
日期:——
Ruthenium(II)-catalyzed dynamic kinetic resolution-asymmetric transferhydrogenation of racemic 2-substituted-N-acetyl-3-oxoindolines to cis-2-substituted-N-acetyl-3-hydroxyindolines is reported. Using the homochiral Ru[TfDPEN](p-cymene)} catalyst with S/C = 400 in a HCO2H/Et3N mixture, up to >99.9% ee and >99 : 1 dr are obtained with high yields (79–98%). This method provides the first example of
据报道钌(II)催化的外消旋2-取代的-N-乙酰基-3-氧代吲哚啉的动态动力学拆分-不对称转移氢化为顺式-2-取代的-N-乙酰基-3-羟基二氢吲哚。在HCO 2 H / Et 3 N混合物中使用S / C = 400的同手性Ru [TfDPEN](p -cymene)}催化剂,可以高收率获得高达> 99.9%ee和> 99:1 dr的高收率( 79–98%)。此方法提供了通过不对称转移氢化(ATH)制备对映体纯的二氢吲哚的第一个实例。
Highly Enantioselective Synthesis of <i>syn</i>-β-Hydroxy α-Dibenzylamino Esters via DKR Asymmetric Transfer Hydrogenation and Gram-Scale Preparation of Droxidopa
of enantiomerically pure syn aryl β-hydroxy α-dibenzylamino esters is reported. The outcome was achieved via dynamic kinetic resolution and asymmetrictransferhydrogenation of aryl α-dibenzylamino β-keto esters. The desired products were obtained in high yields (up to 98%) with excellent diastereoselectivity (>20:1 dr) and enantioselectivity (up to >99% ee). Furthermore, this method was applied for
Correction to “Polyfunctional Imidazolium Aryloxide Betaine/Lewis Acid Catalysts as Tools for the Asymmetric Synthesis of Disfavored Diastereomers”
作者:Felix Willig、Johannes Lang、Andreas C. Hans、Mark R. Ringenberg、Daniel Pfeffer、Wolfgang Frey、René Peters
DOI:10.1021/jacs.9b10389
日期:2019.10.23
the ACS Publications website at DOI: 10.1021/jacs.9b10389. Experimental details, spectral data, 1H and 13C NMR spectra of all new compounds, and HPLC traces, including Figures S1–S28 and Tables S1–S8 (corrected) (PDF) Experimental details, spectral data, 1H and 13C NMR spectra of all new compounds, and HPLC traces, including Figures S1–S28 and Tables S1–S8 (corrected) (PDF) This article references 1 other