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
Nickel-Catalyzed Asymmetric Transfer Hydrogenation and α-Selective Deuteration of <i>N</i>-Sulfonyl Imines with Alcohols: Access to α-Deuterated Chiral Amines
A nickel-catalyzed enantioselective transferhydrogenation and deuteration of N-sulfonyl imines was developed. Excellent α-selectivity and high deuterium content were achieved by using inexpensive 2-propanol-d8 as a deuterium source. As a highlight, no deuteration of β-C–H and the remote C–H of N-sulfonyl amines occurred, which is hard to achieve using other imines or by hydrogen isotope exchange with