Enantioselective Ni–Al Bimetallic Catalyzed exo-Selective C–H Cyclization of Imidazoles with Alkenes
摘要:
A Ni-Al bimetallic catalyzed enantioselective C-H exo-selective cyclization of imidazoles with alkenes has been developed. A series of bi- or polycyclic imidazoles with beta-stereocenter were obtained in up to 98% yield and >99% ee. The bifunctional SPO ligand-promoted bimetallic catalysis proved to be critical to this challenging stereocontrol.
Chiral bidentate aminophosphine ligands: synthesis, coordination chemistry and asymmetric catalysis
作者:Eric J. Zijp、Jarl Ivar van der Vlugt、Duncan M. Tooke、Anthony L. Spek、Dieter Vogt
DOI:10.1039/b414668a
日期:——
determine the electronic character of the phosphine moieties. By reaction of 1 with either PdCl2(cod) or PdCl(CH3)(cod) the cis-complexes 7 and 8 were obtained. The molecular structure for complex 7, cis-[PdCl2(1)], was determined by X-ray crystallography. Reaction of PtCl2(cod) with 1 or 2 yielded the corresponding monomeric cis-isomers 9 and 10. The rhodium derivative [RhCl(CO)(1)] (11) was obtained
Enantioselective Ni–Al Bimetallic Catalyzed <i>exo</i>-Selective C–H Cyclization of Imidazoles with Alkenes
作者:Yin-Xia Wang、Shao-Long Qi、Yu-Xin Luan、Xing-Wang Han、Shan Wang、Hao Chen、Mengchun Ye
DOI:10.1021/jacs.8b02547
日期:2018.4.25
A Ni-Al bimetallic catalyzed enantioselective C-H exo-selective cyclization of imidazoles with alkenes has been developed. A series of bi- or polycyclic imidazoles with beta-stereocenter were obtained in up to 98% yield and >99% ee. The bifunctional SPO ligand-promoted bimetallic catalysis proved to be critical to this challenging stereocontrol.
Enantioselective catalytic rearrangement of cyclohexene oxide with new homochiral bis-lithium amide bases
作者:Olivier Equey、Alexandre Alexakis
DOI:10.1016/j.tetasy.2004.02.030
日期:2004.4
Cyclohexeneoxide can be rearranged with good levels of induction (up to 68% ee) with substoichiometric amounts of chiral bases derived from readily available diamines. The influence of the steric bulk of the amine substituents on the rearrangement enantioselectivity has also been studied.