Indium-Bipyridine Catalyzed, Enantioselective Aminolysis of <i>meso</i>-Epoxides
作者:Christoph Schneider、Enzo Mai
DOI:10.1055/s-2007-984902
日期:——
The scandium-bipyridine-catalyzedenantioselective addition of anilines and O-alkyl hydroxylamines to meso-epoxides has been optimized and extended to a broad range of epoxides and amines. Whereas aromatic meso-epoxides generally furnished the corresponding 1,2-amino alcohols in excellent enantioselectivities, aliphatic meso-epoxides only gave rise to moderate enantioselectivities in the aminolysis
The scandium-bipyridine-catalyzedenantioselective addition of anilines and O-alkyl hydroxylamines to meso-epoxides has been optimized and extended to a broad range of epoxides and amines. Whereas aromatic meso-epoxides generally furnished the corresponding 1,2-amino alcohols in excellent enantioselectivities, aliphatic meso-epoxides only gave rise to moderate enantioselectivities in the aminolysis
Chemoenzymatic synthesis of chiral 2,2′-bipyridine ligands and their N-oxide derivatives: applications in the asymmetric aminolysis of epoxides and asymmetric allylation of aldehydes
作者:D. R. Boyd、N. D. Sharma、L. Sbircea、D. Murphy、J. F. Malone、S. L. James、C. C. R. Allen、J. T. G. Hamilton
DOI:10.1039/b919894f
日期:——
A series of enantiopure 2,2′-bipyridines have been synthesised from the corresponding cis-dihydrodiol metabolites of 2-chloroquinolines. Several of the resulting hydroxylated 2,2′-bipyridines were found to be useful chiral ligands for the asymmetric aminolysis of meso-epoxides leading to the formation of enantioenriched aminoalcohols (→84% ee). N-oxide and N,N′-dioxide derivatives of these 2,2′-bipyridines
Catalytic Asymmetric Ring Opening of <i>meso</i>-Epoxides with Aromatic Amines in Water
作者:Stéphane Azoulay、Kei Manabe、Shū Kobayashi
DOI:10.1021/ol051546z
日期:2005.10.1
[reaction: see text] An operationally simple and environmentally benign protocol for the catalytic asymmetricringopening of meso-epoxides with aromaticamines has been developed. The reactions proceeded smoothly in the presence of 1 mol % of Sc(OSO3C12H25)3 and 1.2 mol % of a chiral bipyridine ligand in water to afford beta-amino alcohols in high yields with excellent enantioselectivities.
[反应:见正文]已经开发出一种操作简单且对环境无害的方案,用于用芳香胺催化中环氧化物的催化不对称开环。反应在水中存在1mol%的Sc(OSO 3 C 12 H 25)3和1.2mol%的手性联吡啶配体的情况下顺利进行,以高收率提供具有优异对映选择性的β-氨基醇。
Asymmetric ring-opening reaction of <i>meso</i>-epoxides with aromatic amines using homochiral metal–organic frameworks as recyclable heterogeneous catalysts
An efficient asymmetricring-opening (ARO) reaction of meso-epoxides with aromatic amines catalysed by a series of homochiral metal–organic frameworks (MOFs) was carried out. Excellent results (up to 95% ee) for the ARO of cyclohexene oxide with several aromatic amines were achieved with a homochiral MOF derived from the ligand (R)-2,2′-dihydroxyl-1,1′-binaphthalene-5,5′-dicarboxylic acid. Furthermore
在一系列纯手性金属有机骨架 (MOF) 催化下,内消旋环氧化物与芳香胺进行了有效的不对称开环 (ARO) 反应。使用衍生自配体 ( R )-2,2'-dihydroxyl-1,1'-binaphthalene-5,5的纯手性 MOF 实现了环氧环己烯与几种芳香胺的 ARO 的优异结果(高达 95% ee)'-二羧酸。此外,基于 ( R )-2,2'-dihydroxy-1,1'-binaphthyl-4,4'-di(4-benzoic acid) 和 ( R )-2,2'-diethoxy-1 的纯手性 MOF, 1'-binaphthyl-4,4'-di(5-isophthalic acid) 催化的顺式ARO 反应β-氨基醇与 1-萘胺的高产率(高达 95%)和出色的对映选择性(高达 97%)。MOF 催化剂在保持其性能的情况下是可回收和可回收的。