Flow synthesis of secondary amines over Ag/Al<sub>2</sub>O<sub>3</sub> catalyst by one-pot reductive amination of aldehydes with nitroarenes
作者:Ekaterina A. Artiukha、Alexey L. Nuzhdin、Galina A. Bukhtiyarova、Valerii I. Bukhtiyarov
DOI:10.1039/c7ra08986d
日期:——
An alumina-supported silver catalyst was investigated in the one-pot reductiveamination of aldehydes with nitroarenes in a continuous flow reactor using molecular hydrogen as a reducing agent. A series of secondary amines containing alkyl, OH, OCH3, Cl, Br and CC groups was synthesized in good to excellent yields. The yield of the secondary amine depends on the rate of formation of an intermediate
Iron-Catalyzed Reductive Coupling of Nitroarenes with Olefins: Intermediate of Iron–Nitroso Complex
作者:Heng Song、Zhuoyi Yang、Chen-Ho Tung、Wenguang Wang
DOI:10.1021/acscatal.9b03604
日期:2020.1.3
Using a single half-sandwich iron(II) compound, Cp*Fe(1,2-Ph2PC6H4S)(NCMe) (Cp*– = C5Me5–, 1) as a catalyst, reductivecoupling of nitroarenes with olefins has been achieved by a well-defined iron(II)/(EtO)3SiH system. Through either inter- or intramolecular reductivecoupling, various branched amines and indole derivatives have been directly synthesized in one-pot. Mechanistic studies showed that
使用单一的半夹心铁(II)化合物作为催化剂,将Cp * Fe(1,2-Ph 2 PC 6 H 4 S)(NCMe)(Cp * – = C 5 Me 5 –,1)作为催化剂,进行还原偶联明确定义的铁(II)/(EtO)3 SiH体系可实现硝基芳烃与烯烃的合成。通过分子间或分子内的还原偶联,已经在一锅中直接合成了各种支链胺和吲哚衍生物。机理研究表明,催化作用是由铁(II)催化剂与硅烷活化硝基芳烃而引发的,从而生成用于C-N键偶联的铁-亚硝基芳烃中间体。
Synthesis of unsaturated secondary amines by direct reductive amination of aliphatic aldehydes with nitroarenes over Au/Al<sub>2</sub>O<sub>3</sub>catalyst in continuous flow mode
作者:A. L. Nuzhdin、E. A. Artiukha、G. A. Bukhtiyarova、S. Yu Zaytsev、P. E. Plyusnin、Yu V. Shubin、V. I. Bukhtiyarov
DOI:10.1039/c6ra20904a
日期:——
A series of unsaturated secondary amines was successfully synthesized by direct reductive amination of aliphatic aldehydes with nitroarenes over a 2.5% Au/Al2O3 catalyst in a continuous flow reactor using molecular hydrogen as a reducing agent. In most cases, the targeted secondary amines were obtained in good to excellent yields. Interestingly, the hydrogenation of CC group is practically absent in
在连续流动反应器中,使用分子氢作为还原剂,通过在2.5%Au / Al 2 O 3催化剂上用硝基芳烃直接将脂肪族醛与硝基芳烃进行还原胺化反应,成功合成了一系列不饱和仲胺。在大多数情况下,目标仲胺以良好至极好的收率获得。有趣的是,在反应条件下,起始醛和仲胺中实际上都没有C C基团的氢化。发现在对位和间位引入了供电子取代基硝基苯的-位增加了仲胺的产率,而在邻位上具有吸电子取代基或供电子的取代基的硝基苯的情况下,观察到目标产物的产率降低。
Synthesis of 3-bromosubstituted pyrroles via palladium-catalyzed intermolecular oxidative cyclization of bromoalkynes with N-allylamines
This paper describes a novel palladium-catalyzedoxidativecyclization of bromoalkynes with N-allylamines via cascade formation of C-N and C-C bonds. During this process, the bromine atom was retained to form 3-bromo-pyrroles, which can undergo the subsequent structural modifications.
From Anilines to Isatins: Oxidative Palladium-Catalyzed Double Carbonylation of CH Bonds
作者:Wu Li、Zhengli Duan、Xueye Zhang、Heng Zhang、Mengfan Wang、Ru Jiang、Hongyao Zeng、Chao Liu、Aiwen Lei
DOI:10.1002/anie.201410321
日期:2015.2.2
A novel palladium‐catalyzed CH double carbonylation introduces two adjacent carbonyl groups for the synthesis of isatins from readily available anilines. The reaction proceeds under atmospheric pressure of CO with high regioselectivity and without any additives. Density functional theory investigations indicate that the palladium‐catalyzed double carbonylation catalytic cycle is plausible.