Colloid and nanodimensional catalysts in organic synthesis: VIII. Hydrogenation of C=N bond with hydrogen in the presence of colloid nickel
摘要:
Hydrogenation of azomethines with hydrogen at atmospheric pressure using nickel nanoparticles as catalyst was carried out. Reaction may be used for the preparation of secondary amines under mild conditions on an available catalyst. Continuation of studies will lead to development of a convenient method for the reductive amination of carbonyl compounds.
High-Throughput Screening of Reductive Amination Reactions Using Desorption Electrospray Ionization Mass Spectrometry
作者:David L. Logsdon、Yangjie Li、Tiago Jose Paschoal Sobreira、Christina R. Ferreira、David H. Thompson、R. Graham Cooks
DOI:10.1021/acs.oprd.0c00230
日期:2020.9.18
screening system that is capable of screening thousands of organicreactions in a single day. This system combines a liquid handling robot with desorption electrospray ionization (DESI) mass spectrometry (MS) for a rapid reaction mixture preparation, accelerated synthesis, and automated MS analysis. A total of 3840 unique reductive amination reactions were screened to demonstrate the throughputs that are
Half-Sandwich Ru(II) Complexes with N,O-Chelate Ligands: Diverse Catalytic Activity for Amine Synthesis in Water
作者:Xue-Jing Yun、Chun Ling、Wei Deng、Zhen-Jiang Liu、Zi-Jian Yao
DOI:10.1021/acs.organomet.0c00554
日期:2020.11.9
Several types of β-ketoamino based N,O-coordinate half-sandwich ruthenium complexes have been synthesized in moderate to good yields. The stable ruthenium complexes displayed good and diverse catalytic efficiency in reductiveamination between aldehydes and amines in aqueous solution. The method gave a facile route for one-pot synthesis of diverse complicated amines with a low catalyst loading by using
已经以中等至良好的产率合成了几种类型的基于β-酮氨基的N,O-配位半三明治钌络合物。稳定的钌络合物在水溶液中的醛和胺之间的还原胺化反应中表现出良好的催化效率。该方法通过使用廉价且毒性较小的HCOOH或干净的H 2作为氢源,为一锅法合成具有低催化剂负载量的多种复杂胺提供了一条简便的途径。催化剂Ru1表现出190 h –1的最高催化活性苯甲醛与苯胺的还原胺化反应中的TOF值。在标准催化体系下,相应的胺产物以优异的产率提供。有效和多样化的催化活性,广泛的物质范围,温和的条件以及对环境无害的溶剂使该系统潜在地可用于工业生产。使用NMR,元素分析和IR技术对钌配合物进行表征,以确认其结构。
Hydrogen-Borrowing Amination of Secondary Alcohols Promoted by a (Cyclopentadienone)iron Complex
作者:Xishan Bai、Francesco Aiolfi、Mattia Cettolin、Umberto Piarulli、Alberto Dal Corso、Luca Pignataro、Cesare Gennari
DOI:10.1055/s-0039-1690101
日期:2019.9
(HB) amination has been expanded to secondaryalcohols, which had previously been reported to react only in the presence of large amounts of co-catalysts. A range of cyclic and acyclic secondaryalcohols were reacted with aromatic and aliphatic amines giving fair to excellent yields of the substitution products. The catalyst was also able to promote the cyclization of diols bearing a secondary alcohol
selective methods, but the re- action conditions are somewhat harsh, as strong reducing reagents must be used. Nowadays, the formation of C-N bonds via cross- coupling reactions is an essential methodology for the preparation of nitrogen-containing compounds. Recently, different transition-metal-promoted reactions have been developed for the synthesis of secondary amines: catalytic systems for N-alkylation
介绍了一种简单的铜促进的苯胺 N-单烷基化,它利用烷基硼酸作为烷基化伙伴。该反应在回流的二恶烷中进行,它允许在一个步骤中对许多结构和电子不同的苯胺进行官能化。进行了广泛的研究以证明这种新方法在制备苯乙基苯胺方面的实用性。芳香胺是生物活性化合物,广泛存在于制药和农业化学工业中。1 因此,开发新的合成方法仍然是一个活跃的研究领域。特别吸引人的是广泛使用的初级苯胺转化为相应的次级苯胺。直接烷基化通常通过在碱存在下与烷基卤或类似试剂反应来完成。这似乎是一个简单的转化,但在许多情况下,由于过度烷基化,伯苯胺的有效 N-单烷基化是不可能的,这会提供叔苯胺或季铵盐作为副产物。其他制备单烷基化苯胺的方法基于使用允许引入单个烷基的临时保护基团(例如氨基甲酸酯、苄基),然后去除保护基团(引入两个额外的步骤)过程)。然而,由于它们的毒性,必须避免使用许多烷化剂,尤其是在 API 和活性化合物合成的最后一步。羰基
Rapid Microwave-Assisted Reductive Amination of Ketones with Anilines
Using microwave technology, a new protocol has been developed that improves the reaction rate and overall efficiency of the directreductive amination of ketones with anilines. When using sodium triacetoxyborohydride as the reducing agent, high product yields and increased reaction rates are achieved for a variety of electronically different anilines. Furthermore, we have found that this protocol can