Optically Active 1,1′-Spirobiindane-7,7′-diol (SPINOL)-Based Phosphoric Acids as Highly Enantioselective Catalysts for Asymmetric Organocatalysis
作者:Chun-Hui Xing、Yuan-Xi Liao、Jaclynn Ng、Qiao-Sheng Hu
DOI:10.1021/jo200302x
日期:2011.5.20
of optically active 1,1′-spirobiindane-7,7′-diol (SPINOL)-based phosphoricacids are described. These SPINOL-based phosphoricacids were prepared from (R)-SPINOL in three steps and exhibited excellent enantioselectivities for the reactions of indoles with aldimines and β,γ-unsaturated-α-ketoesters. Our study provides a family of promising chiral phosphoricacids to the asymmetric organocatalysis toolbox
Access to Chiral Bisphenol Ligands (BPOL) through Desymmetrizing Asymmetric Ortho-Selective Halogenation
作者:Xiaodong Xiong、Tianyu Zheng、Xinyan Wang、Ying-Lung Steve Tse、Ying-Yeung Yeung
DOI:10.1016/j.chempr.2020.01.009
日期:2020.4
Privileged chiral catalyst scaffolds are highly useful in chemical synthesis such as drug preparation. Substituted phenol ligands are among the most frequently used scaffolds. However, the preparation of chiral phenol ligands commonly involves tedious synthetic procedures. Herein, we describe a facile strategy to prepare potent chiral bisphenols (BPOLs) through the desymmetrizing asymmetric ortho-halogenation