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
Titanium-mediated cross-coupling reactions of imines with ketones or aldehydes: an efficient route for the synthesis of 1,2-amino alcohols
作者:Guoqin Fan、Yuanhong Liu
DOI:10.1016/j.tetlet.2012.07.020
日期:2012.9
The cross-coupling reactions of imines with ketones using Ti(OiPr)4/c-C5H9MgCl reagent lead to 1,2-amino alcohols after hydrolysis. The coupling reactions with aldehydes could also afford 1,2-amino alcohols, however, in some cases, aziridines were obtained as major products in a stereoselective manner.
使用Ti(O i Pr)4 / c -C 5 H 9 MgCl试剂使亚胺与酮的交叉偶联反应在水解后生成1,2-氨基醇。与醛的偶联反应也可以得到1,2-氨基醇,但是,在某些情况下,以立体选择的方式获得了氮丙啶作为主要产物。
Synthesis of enantiopure β-amino alcohols via AKR/ARO of epoxides using recyclable macrocyclic Cr(III) salen complexes
作者:Rukhsana Ilays Kureshy、K. Jeya Prathap、Manish Kumar、Prasanta Kumar Bera、Noor-ul Hasan Khan、Sayed Hasan Razi Abdi、Hari Chandra Bajaj
DOI:10.1016/j.tet.2011.08.077
日期:2011.10
A series of chiral macrocyclic Cr(III) salen complexes 1–8 were synthesized and characterized. These complexes were found to be highly active, regio-, diastereo-, and enantioselective catalysts in aminolytic kinetic resolution (AKR) of racemic trans-epoxides as well as asymmetricringopening (ARO) of prochiral meso-epoxides with various anilines as nucleophiles at room temperature in 18–24 h. Excellent
The catalytic asymmetric ring opening of meso-epoxides with aromatic amines was achieved using a new proline-basedN,N′-dioxide-indiumtris(triflate) complex in high yields (up to 99%) with excellent enantioselectivities (up to 99% ee) under mild conditions. The coordination ability of N,N′-dioxide 1c was investigated by X-ray and NMR analysis. A plausible seven-coordinate transition state model was
Zirconium dodecyl sulfate [Zr(DS) 4 ] is an efficientcatalyst for the aminolysis of epoxides in water at pH 5.0. Epoxides and anilines were used and the corresponding β-amino alcohols were isolated in generally high regioselectivity and excellent yields.