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
Reusable Co-nanoparticles for general and selective <i>N</i>-alkylation of amines and ammonia with alcohols
作者:Zhuang Ma、Bei Zhou、Xinmin Li、Ravishankar G. Kadam、Manoj B. Gawande、Martin Petr、Radek Zbořil、Matthias Beller、Rajenahally V. Jagadeesh
DOI:10.1039/d1sc05913k
日期:——
A general cobalt-catalyzed N-alkylation of amines with alcohols by borrowing hydrogen methodology to prepare different kinds of amines is reported. The optimal catalyst for this transformation is prepared by pyrolysis of a specific templated material, which is generated in situ by mixing cobalt salts, nitrogen ligands and colloidal silica, and subsequent removal of silica. Applying this novel Co-nanoparticle-based
efficient copper-catalyzed selectivetransferhydrogenation of nitriles to primary amine-boranes and secondary amines with an oxazaborolidine–BH3 complex is reported. The selectivity control was achieved under mild conditions by switching the solvent and the copper catalysts. More than 30 primary amine-boranes and 40 secondary amines were synthesized via this strategy in high selectivity and yields of up to
Aluminum Metal–Organic Framework-Ligated Single-Site Nickel(II)-Hydride for Heterogeneous Chemoselective Catalysis
作者:Neha Antil、Ajay Kumar、Naved Akhtar、Rajashree Newar、Wahida Begum、Ashutosh Dwivedi、Kuntal Manna
DOI:10.1021/acscatal.0c04379
日期:2021.4.2
and heterogeneous earth-abundant metal catalysts is essential for environmentally friendly chemical synthesis. We report a highly efficient, chemoselective, and reusable single-site nickel(II) hydride catalyst based on robust and porous aluminum metal–organic frameworks (MOFs) (DUT-5) for hydrogenation of nitro and nitrile compounds to the corresponding amines and hydrogenolysis of arylethers under
化学选择性的和非均质的富含地球的金属催化剂的开发对于环境友好的化学合成至关重要。我们报告了一种高效,化学选择性和可重复使用的单中心氢化镍(II)氢化物催化剂,该催化剂基于坚固且多孔的铝金属有机骨架(MOFs)(DUT-5),用于将硝基和腈化合物加氢成相应的胺并进行氢解温和条件下制备芳基醚。镍-氢化物催化剂的制备是通过的氢氧化铝次级结构单元的金属化的Al具有(μ的式DUT-5的(事业部)2 -OH)(BPDC)(BPDC = 4,4'-联苯双酯)与NIBR 2然后与NaEt 3反应BH。DUT-5-NiH具有广泛的底物范围,在1 bar H 2下氢化芳族和脂肪族硝基和腈化合物时,具有出色的官能团耐受性至少可以回收再利用10次。通过改变腈氢化的反应条件,还选择性地提供了对称或不对称的仲胺。实验和计算研究表明,在营业额限制步骤中,镍与镍的可逆腈配位是可逆的,然后将1,2-的配位腈插入氢化镍中。此
A General One-Step Synthesis of Multidentate (Pyridylalkyl)amines from Mono-, Bis-, Tris- and Tetrakis(bromomethyl)benzenes: Potential Ligands for Supramolecular Assembly
ligands is of ongoing interest. In this report, the one-step syntheses of a series of (pyridylalkyl)amine derivatives is described. The reported compounds contain both pyridine rings and sp 3 -hybridized nitrogen as potential donor sites. The general synthetic method involves- a room temperature reaction of mono-, bis-, tris-, or tetrakis-(bromomethyl)benzenes with an excess of (pyridylmethyl)amine in