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
Asymmetric Friedel−Crafts Reaction of Indoles with Imines by an Organic Catalyst
作者:Yong-Qiang Wang、Jun Song、Ran Hong、Hongming Li、Li Deng
DOI:10.1021/ja062700v
日期:2006.6.1
In this communication, we report an asymmetric Friedel-Craftsreaction of indoles with imines catalyzed by a bifunctional cinchona alkaloid catalyst. This is the first efficient organocatalytic asymmetric Friedel-Craftsreaction of indoles with imines. This reaction is operationally simple and, unprecedentedly, affords high enantioselectivity for a wide range of indoles and both aryl and alkyl imines
This manuscript reports on a suitable method for the synthesis of paracyclophane type, ferrocene‐bridged chiral phosphoric acids, which bear silyl‐substituents on their paracyclophane frameworks. These acids have been obtained easily in enantiomerically pure form, by taking advantage of (S)‐(1‐phenyl‐2‐cyanoethyl)phosphorodiamidite as a phosphorylating agent. They have been used then as catalysts for
Enantioselective Continuous-Flow Production of 3-Indolylmethanamines Mediated by an Immobilized Phosphoric Acid Catalyst
作者:Laura Osorio-Planes、Carles Rodríguez-Escrich、Miquel A. Pericàs
DOI:10.1002/chem.201303860
日期:2014.2.17
polystyrene‐supported 1,1’‐bi‐2‐naphthol derived phosphoricacid has been synthesized and applied in the enantioselective Friedel–Crafts reaction of indoles and sulfonylimines. The immobilizedcatalyst was highly active and selective, and gave rise to a broad range of 3‐indolylmethanamines (19 examples) in high yields and excellent enantioselectivities (up to 98 % enantiomeric excess) after short reaction
Catalytic asymmetric cleavage of sp<sup>3</sup>C–N bonds for access to highly enantioenriched N-benzylic sulfonamides
作者:Xue-Song Wu、Shi-Kai Tian
DOI:10.1039/c1cc16630a
日期:——
In the presence of 10 mol% of a chiral phosphoric acid, a variety of racemic N-benzylic sulfonamides having N-(3-indolyl)methyl groups smoothly undergo kinetic resolution with benzyl thiol at 0 °C or at room temperature and the remaining sulfonamides are recovered in moderate to excellent yields and with excellent ee.