Asymmetric Stepwise Reductive Amination of Sulfonamides, Sulfamates, and a Phosphinamide by Nickel Catalysis
作者:Xiaohu Zhao、Haiyan Xu、Xiaolei Huang、Jianrong Steve Zhou
DOI:10.1002/anie.201809930
日期:2019.1.2
Asymmetricreductive amination of poorly nucleophilic sulfonamides was realized in the presence of nickel catalysts and titanium alkoxide. A wide range of ketones, including enolizable ketones and some biaryl ones, were converted into sulfonamides in excellent enantiomeric excess. The cyclization of sulfamates and intermolecular reductive amination of a diarylphosphinamide were also successful. Formic
Enantioselective, intermolecular benzylic C–H amination catalysed by an engineered iron-haem enzyme
作者:Christopher K. Prier、Ruijie K. Zhang、Andrew R. Buller、Sabine Brinkmann-Chen、Frances H. Arnold
DOI:10.1038/nchem.2783
日期:2017.7
highly selective, and renewable catalysts exist. Here we report the directedevolution of an iron-containing enzymatic catalyst—based on a cytochrome P450 monooxygenase—for the highly enantioselective intermolecular amination of benzylic C–H bonds. The biocatalyst is capable of up to 1,300 turnovers, exhibits excellent enantioselectivities, and provides access to valuable benzylic amines. Iron complexes
describe a catalytic asymmetric iminium ion cyclization reaction of simple 2-alkenylbenzaldimines using a BINOL-derived chiral N-triflyl phosphoramide. The corresponding 1-aminoindenes and tetracyclic 1-aminoindanes are formed in good yields and high enantioselectivities. Further, the chemical utility of the obtained enantiopure 1-aminoindene is demonstrated for the asymmetric synthesis of (S)-rasagiline
我们描述了使用 BINOL 衍生的手性N-三氟甲基磷酰胺的简单 2-烯基苯甲醛二亚胺的催化不对称亚胺离子环化反应。相应的 1-氨基茚和四环 1-氨基茚以良好的产率和高对映选择性形成。此外,所获得的对映体纯 1-氨基茚的化学效用被证明用于 ( S )-雷沙吉兰的不对称合成。
including α-amino acids, diamines, diphosphines, bis-oxazolines, and diimines, support efficient copper-catalyzedamination of benzylic hydrocarbons by anhydrous chloramine-T. Catalysts derived from homochiral ligands, particularly chiral diimines, effect aminosulfonation with low to moderate enantioselectivity.
A chiral 3.3',5,5'-tetrabromosubstituted (salen)manganese(III) complex was found to be an efficient catalyst for asymmetric Cn amination (up to 89% ee). In the reaction of cycloalkenes, allylic amination occurred in preference to aziridination, (C) 2001 Elsevier Science Ltd. All rights reserved.