Herein, we demonstrated an efficient protocol for reductivealkylation of azides/nitro compounds via a borrowing hydrogen (BH) method. By following this protocol, selective mono- and dialkylated amines were obtained under mild and solvent-free conditions. A series of control experiments and deuterium-labeling experiments were performed to understand this catalytic process. Mechanistic studies suggested
First example of direct reductive amination of aldehydes with primary and secondary amines catalyzed by water-soluble transition metal catalysts
作者:André Robichaud、Abdelaziz Nait Ajjou
DOI:10.1016/j.tetlet.2006.03.153
日期:2006.5
selective direct reductive amination of aldehydes with primary and secondaryamines in water using gaseous hydrogen and water-soluble catalysts is developed. The catalytic system formed in situ from Pd(PhCN)2Cl2 and 2,2′-biquinoline-4,4′-dicarboxylic acid dipotassium salt (BQC), allows full conversion of aldehydes and the formation of desired alkylated amines with excellent yields and selectivities
Selective Synthesis of Secondary and Tertiary Amines by Reductive
<i>N‐</i>
Alkylation of Nitriles and
<i>N‐</i>
Alkylation of Amines and Ammonium Formate Catalyzed by Ruthenium Complex
作者:Iryna D. Alshakova、Georgii I. Nikonov
DOI:10.1002/cctc.201900561
日期:2019.11.7
syntheses of secondary and tertiary amines via reductive N‐alkylation of nitriles and N‐alkylation of primary amines is proposed. Isomeric complexes 8 catalyze transfer hydrogenation and N‐alkylation of nitriles in ethanol to give secondaryamines. Unsymmetrical secondaryamines can be produced by N‐alkylation of primary amines with alcohols via the borrowing hydrogen methodology. Aliphatic amines were obtained
Fluorescent flipper probes have been introduced recently to image membrane tension in live cells, and strategies to target these probes to specific membranes are emerging. In this context, early endosome (EE) targeting without the use of protein engineering is especially appealing because it translates into a fascinating transport problem. Weakly basic probes, commonly used to track the inside of acidic
最近引入了荧光鳍状探针来对活细胞中的膜张力进行成像,并且正在出现将这些探针靶向特定膜的策略。在这种情况下,不使用蛋白质工程的早期内体 (EE) 靶向特别有吸引力,因为它转化为一个迷人的运输问题。通常用于追踪酸性晚期内体和溶酶体内部的弱碱性探针在 EE 中的保留很差,因为它们在弱酸性 EE 中被充分中和,从而能够扩散出去。在这里,我们公开了一种使用具有更高 p K a的取代苄胺靶向 EE 的合理策略值作为鳍状探针的头组。由此产生的 EE 鳍状肢经过验证,具有保留的机械敏感性,可用于生物学,特别是阐明内吞作用的机制。
One-pot, chemoselective synthesis of secondary amines from aryl nitriles using a PdPt–Fe<sub>3</sub>O<sub>4</sub> nanoparticle catalyst
作者:Jin Hee Cho、Sangmoon Byun、Ahra Cho、B. Moon Kim
DOI:10.1039/d0cy00630k
日期:——
unsymmetrical secondary amines under mild conditions. However, aryl nitriles containing an electron-donating substituent were rather resistant to the reductive amination, and when hexafluoroisopropanol (HFIP) was used as a co-solvent, the reaction selectivity and yield for unsymmetrical secondary amines increased dramatically. Using the catalyst system, one-pot, gram-scale synthesis of indole was possible
我们已经开发了一种新的催化方法,用于通过PdPt-Fe 3 O 4纳米颗粒(NP)催化剂通过芳基腈与硝基烷烃的还原胺化反应,实现不对称仲胺的一锅级联反应。与单金属Pd–Fe 3 O 4或Pt–Fe 3 O 4相比,双金属催化剂的使用提高了反应性和选择性。NP催化剂。使用这种双金属催化体系,我们成功地在温和条件下合成了各种不对称仲胺。然而,含有给电子取代基的芳基腈相当耐还原胺化,当使用六氟异丙醇(HFIP)作为助溶剂时,不对称仲胺的反应选择性和收率大大提高。使用催化剂体系,可以由2-硝基苯基乙腈一锅克级地合成吲哚。由于Fe 3 O 4载体的磁性,双金属催化剂可以容易地使用外部磁体至少循环四次。