Different from any other catalytic systems containing transition metals and additives, sodium hydroxide itself was found to be a unique and effective catalyst for the solvent-free synthesis of the secondary amines via the N-alkylation of amines with alcohols. For the reaction of aniline with benzyl alcohol, 99.6 mol% conversion of aniline and 99.5% selectivity of the product were achieved under optimal
Palladium nanoparticles stabilised by cinchona-based alkaloids in glycerol: efficient catalysts for surface assisted processes
作者:A. Reina、C. Pradel、E. Martin、E. Teuma、M. Gómez
DOI:10.1039/c6ra19230k
日期:——
Cinchona-based alkaloids led to well-dispersed palladium nanoparticles in neat glycerol, leading to efficient eco-friendly catalytic phases in hydrogenations and hydrodehalogenations.
基于金鸡纳碱的化合物在纯甘油中导致钯纳米颗粒良好分散,从而在氢化和脱卤反应中形成高效环保的催化相。
Transfer Hydrogenation of Ketones and Imines with Methanol under Base-Free Conditions Catalyzed by an Anionic Metal–Ligand Bifunctional Iridium Catalyst
作者:Rongzhou Wang、Xingyou Han、Jing Xu、Peng Liu、Feng Li
DOI:10.1021/acs.joc.9b02957
日期:2020.2.21
An anionic iridium complex [Cp*Ir(2,2'-bpyO)(OH)][Na] was found to be a general and highly efficient catalyst for transfer hydrogenation of ketones and imines with methanol under base-free conditions. Readily reducible or labile substituents, such as nitro, cyano, and ester groups, were tolerated under present reaction conditions. Notably, this study exhibits the unique potential of anionic metal-ligand
N-alkylation of amines with alcohols over alumina-entrapped Ag catalysts using the “borrowing hydrogen” methodology
作者:Huihui Liu、Gaik-Khuan Chuah、Stephan Jaenicke
DOI:10.1016/j.jcat.2012.05.007
日期:2012.8
Ag/Al2O3 catalysts were found to be highly active and selective in the N-alkylation of aniline with a variety of aromatic and linear alcohols. In the presence of a base, for example, Cs2CO3 or K3PO4 as promoter, high yields of secondary amines were obtained. The highest activity was found with 2.4 wt.% Ag/Al2O3. The reaction involves the transient catalytic dehydrogenation of the alkylating alcohol
发现Ag / Al 2 O 3催化剂在苯胺与多种芳族和直链醇的N-烷基化中具有高活性和选择性。在碱例如Cs 2 CO 3或K 3 PO 4作为促进剂的存在下,可获得高产率的仲胺。发现活性最高的是2.4 wt。%的Ag / Al 2 O 3。。该反应涉及烷基化醇的瞬时催化脱氢成相应的羰基化合物,然后该羰基化合物与胺自发反应。在最后一步中,将来自醇脱氢步骤的氢转移回亚胺,得到仲胺作为最终产物。半仲中间体与仲胺,哌啶和吡咯烷一起可以进行脱氢和脱水,分别得到酰胺和胺。Ag / Al 2 O 3的异质性使其易于回收和再生,这使其在绿色和可持续合成的背景下成为有吸引力的系统。
Transfer hydrogenative reductive amination of aldehydes in aqueous sodium formate solution
作者:Mengping Zhu
DOI:10.1016/j.tetlet.2015.12.072
日期:2016.1
A practical direct reductive amination reaction of aldehydes in aqueous sodium formate solution which produces amines in good yields under mild conditions is described. The amount and strength of the acid additives were critical factors to affect the reaction selectivities. This reductive amination method has great application potential for the synthesis of amine products given the mild conditions