AgOAc catalyzed asymmetric [3+2] cycloaddition of azomethine ylides with chiral ferrocene derived P,S ligands
作者:Wei Zeng、Yong-Gui Zhou
DOI:10.1016/j.tetlet.2007.04.101
日期:2007.6
Ferrocene derived P,S-heterodonor ligands were effectively used in AgOAc catalyzed asymmetriccycloaddition of azomethineylides. The roles of planar chirality and electronic properties of the phosphorous substituents have been examined, and up to 93% ee was obtained.
Hydrogen-Bonding Directed Reversal of Enantioselectivity
作者:Wei Zeng、Guo-Ying Chen、Yong-Gui Zhou、Yu-Xue Li
DOI:10.1021/ja067346f
日期:2007.1.1
successful stereochemical reversal was achieved in AgOAc catalyzed [3+2] cycloaddition by the formation of hydrogen bonding between ligand and reactant. This strategy provides an efficient and convenient route to prepare both enantiomers of a chiral compound. DFT studies proposed a reasonable mechanism of the reversal of the enantioselectivity; hydrogen bonding changed the transition state. The strategy
Synthesis of new chiral ferrocenyl P,N-ligands with a benzoxazole ring and their application in Ag-catalyzed asymmetric [3+2] cycloaddition
作者:Sheng Yan、Cheng Zhang、Ya-Hui Wang、Zhong Cao、Zhuo Zheng、Xiang-Ping Hu
DOI:10.1016/j.tetlet.2013.05.003
日期:2013.7
New chiral ferrocenyl P,N-ligands with a benzoxazole ring as the N-donor group have been synthesized from 2-aminophenol through a three-step transformation and successfully employed in the Ag-catalyzed asymmetric [3+2] cycloaddition of azomethine ylides with electron-deficient alkenes. High diastereoselectivities, excellent enantioselectivities, and good yields have been achieved for a variety of substrates, demonstrating the potential of these new P,N-ligands in asymmetric catalysis. (C) 2013 Elsevier Ltd. All rights reserved.