Reductive amination of various ketones and aldehydes by transferhydrogenation under aqueous conditions has been developed, by using cyclometallated iridium complexes as catalysts and formate as hydrogen source. The pH value of the solution is shown to be critical for a high catalytic chemoselectivity and activity, with the best pH value being 4.8. In comparison with that in organic solvents, the reductive
Chemoselective Reductive Amination of Aldehydes and Ketones by Dibutylchlorotin Hydride-HMPA Complex
作者:Toshihiro Suwa、Erika Sugiyama、Ikuya Shibata、Akio Baba
DOI:10.1055/s-2000-6273
日期:——
Reductive amination of various aldehydes and ketones has been performed effectively by pentacoordinate chloro-substituted tin hydride complex, Bu2SnClH-HMPA. The tin reagent worked particularly well for the case using weakly basic aromatic amines as starting substrates. Stoichiometric amounts of a substrate and a reducingagent were adequate for the reaction. The Sn-Cl bond in the complex plays an
molecular diversity, which is highly sought after in a wide range of biologically active natural products and drugs. Herein, we present a new strategy for the synthesis of secondary amines via iridium-catalyzed one-pot reductive amination of carbonyl compounds with nitro compounds. This method is demonstrated for a variety of carbonyl compounds, including miscellaneous aldehydes and ketones, which are compatible
DMSO methylates a broad range of amines in the presence of formic acid, providing a novel, green and practical method for aminemethylation. The protocol also allows the one‐pot transformation of aromatic nitro compounds into dimethylated amines in the presence of a simple iron catalyst.
Construction of α-Alkylated Amines by Iridium Complex-Catalyzed One-Step Transfer Hydrogenation of C=C and C=N Bonds
作者:Renshi Luo、Yanping Xia、Lu Ouyang、Jianhua Liao、Xiao Yang
DOI:10.1055/a-1344-2126
日期:2021.5
Hydrogenation of C=C bond and reductive amination are important transformations utilized in chemistry. An environmentally friendly, efficient, and facile one-pottransferhydrogenation of C=C bond of enones and reductive amination of C=N bond of imines are reported using iridium complex as catalysts and formic acid as hydrogen source in aqueous medium. In this catalytic system, a wide range of α-alkylated
C = C键的加氢和还原胺化是化学中重要的转变。据报道,使用铱络合物作为催化剂,甲酸为氢源,在水性介质中,对烯酮的C = C键进行环境友好,高效,便捷的一锅转移加氢和亚胺的C = N键还原胺化。在该催化体系中,通过C = C键的一锅转移加氢和还原胺化,可以以优异的收率获得各种α-烷基胺。该协议的实际应用以克级转换为特征。