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
Asymmetric Friedel–Crafts addition of indoles to N-sulfonyl aldimines catalyzed by Cu(<scp>ii</scp>) chiral amino alcohol based Schiff base complexes
作者:Prathibha Kumari、Prasanta Kumar Bera、Noor-ul H. Khan、Rukhsana I. Kureshy、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1039/c3cy00629h
日期:——
Recyclable copper(II) chiral amino alcohol based Schiff base complexes smoothly catalysed the Friedel–Crafts alkylation of indole with aryl aldimine in good yields (98%) and with enantioselectivities up to 97%. The effects of ligand structure, solvent, metal source and temperature on the reaction were also studied. The catalytic system worked very well several times retaining its performance. To understand
Highly Enantioselective Friedel−Crafts Reaction of Indoles with Imines by a Chiral Phosphoric Acid
作者:Qiang Kang、Zhuo-An Zhao、Shu-Li You
DOI:10.1021/ja067417a
日期:2007.2.1
Highly enantioselective Friedel−Craftsreactions of indoles with imines catalyzed by a chiralphosphoricacid are developed, affording the 3-indolyl methanamine derivatives with up to >99% ee for a wide range of substrates.
开发了由手性磷酸催化的吲哚与亚胺的高度对映选择性 Friedel-Crafts 反应,为各种底物提供高达 >99% ee 的 3-吲哚基甲胺衍生物。
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