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 transfer hydrogenation 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。