An imidazolium-modified chiral rhodium/diamine-functionalized periodic mesoporous organosilica for asymmetric transfer hydrogenation of α-haloketones and benzils in aqueous medium
作者:Feng Zhou、Xiaoying Hu、Ming Gao、Tanyu Cheng、Guohua Liu
DOI:10.1039/c6gc01589a
日期:——
Use of a hydrophobic, imidazolium-functionalized periodicmesoporousorganosilica for immobilizations of chiral organometalliccomplexes as a heterogeneouscatalyst is a highly desirable as this catalyst can promote greatly an aqueous...
Enantioselective Pinacol Coupling of Aryl Aldehydes Catalyzed by Chiral Salan−Mo(IV) Complexes
作者:Hongwei Yang、Hongsong Wang、Chengjian Zhu
DOI:10.1021/jo701842r
日期:2007.12.1
Reported herein is the asymmetricpinacolcoupling of aromatic aldehydes with chiral Salan−Mo(VI) dioxo complex as an effective precatalyst. Chiral diols were obtained with high diastereoselectivity and enantioselectivity up to 92/8 and 95%, respectively. The possible mechanism of the pinacolcoupling reaction with the catalytic system was investigated. The X-ray crystal structure of the precatalyst
Stereoselective Synthesis of Optically Active Hydrobenzoins via Asymmetric Hydrogenation of Benzils with Ru(OTf)(TsDPEN)(η6-cymene) as the Pre-catalyst
作者:Xiaofei Huang、Naikai Li、Zhicong Geng、Fengfeng Pan、Xingwang Wang
DOI:10.1002/cjoc.201200393
日期:2012.8.14
Opticallyactivehydrobenzoins are very important building blocks for further derivation of biologically active complexes, natural products, and pharmaceutical compounds. In this paper, A practical approach has been developed for asymmetrichydrogenation of benzils with Ru(OTf)(TsDPEN)(η6‐cymene) as a pre‐catalyst in methanol. Therefore, a series of chiral hydrobenzoins was synthesized in good yields
Enantioselective Pinacol Coupling of Aldehydes Mediated and Catalyzed by Chiral Titanium Complexes
作者:Ahlem Bensari、Jean-Luc Renaud、Olivier Riant
DOI:10.1021/ol016664a
日期:2001.11.1
Starting from easily available chiral Schiff bases, a straightforward synthesis of air-stable titanium(IV) complexes was devised. Asymmetric pinacol coupling of aromatic aldehydes mediated and catalyzed by the corresponding low valent complexes afforded the chiral diols with high yields and enantioselectivities up to 91%. [reaction: see text]
Synthesis of Chiral Self-Assembling Rhombs and Their Characterization in Solution, in the Gas Phase, and at the Liquid−Solid Interface
作者:Kyung Seok Jeong、Sun Young Kim、Ueon-Sang Shin、Michael Kogej、Nguyen T. M. Hai、Peter Broekmann、Nakcheol Jeong、Barbara Kirchner、Markus Reiher、Christoph A. Schalley
DOI:10.1021/ja053781i
日期:2005.12.1
Chiral, enantiopure metallo-supramolecular rhombs self-assemble in solution through coordination of bis-pyridyl-substituted ligands with (en)M(NO3)2 (en = ethylenediamine, M = Pd(II), Pt(II)). Characterization by NMR and CD spectroscopy in solution and by ESI-FT-ICR mass spectrometry in the gas phase suggests that an equilibrium exists in water/methanol of a major 2:2 complex and a minor 3:3 complex