A novel Fe(II)/diaryl prolinol catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylides with alkenes
作者:Haisheng Wu、Bo Wang、Hongqiang Liu、Lei Wang
DOI:10.1016/j.tet.2010.11.091
日期:2011.2
A novel Fe(II)/diaryl prolinol catalyzed asymmetric1,3-dipolarcycloaddition of azomethineylides with alkenes has been developed. In the presence of FeCl2 (10 mol %) and α,α-bis(3,5-bistrifluoromethylphenyl)prolinol L1 (10 mol %), [3+2] cycloaddition of azomethineylides with electronic-deficient olefins underwent smoothly in CH3CN at room temperature to generate the desired endo-adducts in moderate
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
A new chiral phosphine oxide ligand for enantioselective 1,3-dipolar cycloaddition reactions of azomethine ylides
作者:Serap Eröksüz、Özdemir Dogan、Philip P. Garner
DOI:10.1016/j.tetasy.2010.10.002
日期:2010.10
A new set of phosphorus-containing chiral ligands has been synthesized and used with silver(I) for the catalytic asymmetric 1 3-dipolar cycloaddition reaction of azomethine ylides One of these ligands (POFAM6) was found to produce an effective catalyst for the asymmetric 1 3 dipolar cycloaddition reaction of azomethine ylides with electron deficient dipolarophiles to form pyrrolidines in up to 97% yield and 89% (C) 2010 Elsevier Ltd All rights reserved
Highly Enantioselective 1,3-Dipolar Cycloaddition of Azomethine Ylides Catalyzed by Copper(I)/TF-BiphamPhos Complexes
A new and highly efficient Cu(I)/TF-BiphamPhos catalytic system exhibited excellent reactivity, enantio-/diastereoselectivity, and structural scope in asymmetric 1,3-dipolarcycloaddition of azomethineylides with 0.1-3 mol % of catalyst loading. The present methodology is the best result for asymmetric cycloaddition of azomethineylides, especially derived from amino esters other than glycinate in