在此,我们报道了第一个 Fe II催化的胺类有氧仿生氧化反应。这种氧化反应涉及几个电子转移步骤,受到呼吸链中生物氧化的启发。从胺到分子氧的电子转移由两个耦合催化氧化还原系统辅助,这降低了能垒并提高了氧化反应的选择性。铁氢转移络合物被用作底物选择性脱氢催化剂,同时双功能对苯二酚/钴希夫碱络合物作为混合电子转移介体。各种伯胺和仲胺在空气中被氧化成其相应的醛亚胺或酮亚胺,收率良好至优异。
Iron-Catalyzed Nitrene Transfer Reaction of 4-Hydroxystilbenes with Aryl Azides: Synthesis of Imines via C═C Bond Cleavage
作者:Yi Peng、Yan-Hui Fan、Si-Yuan Li、Bin Li、Jing Xue、Qing-Hai Deng
DOI:10.1021/acs.orglett.9b03160
日期:2019.10.18
C═C bond breaking to access the C═N bond remains an underdeveloped area. A new protocol for C═C bond cleavage of alkenes under nonoxidative conditions to produce imines via an iron-catalyzed nitrene transfer reaction of 4-hydroxystilbenes with aryl azides is reported. The success of various sequential one-pot reactions reveals that the good compatibility of this method makes it very attractive for
Ruthenium-Catalyzed Reductive Amination without an External Hydrogen Source
作者:Pavel N. Kolesnikov、Niyaz Z. Yagafarov、Dmitry L. Usanov、Victor I. Maleev、Denis Chusov
DOI:10.1021/ol503595m
日期:2015.1.16
A ruthenium-catalyzed reductiveaminationwithout an externalhydrogensource has been developed using carbon monoxide as the reductant and ruthenium(III) chloride (0.008–2 mol %) as the catalyst. The method was applied to the synthesis of antianxiety agent ladasten.
Reactions of iminotropone derivatives with naphtho[b]cyclopropene under the presence of a catalytic amount of AgBF 4 afforded cyclic amine derivatives via [2 π + 2 σ] type cycloaddition reactions. On the other hand, a reaction using a tropone hydrazone derivative without a catalysis formed a substituted hydrazone via a σ -bond rupture of the cyclopropene ring.
Switchable imine and amine synthesis catalyzed by a tripodal ligand-supported well-defined cobaltcomplex is presented herein. A large variety of primary alcohols and amines were selectively converted to imines or amines in good to excellent yields. It is discovered that the base plays a crucial role on the selectivity. A catalytic amount of base leads to the imine formation, while an excess loading
Expedient Synthesis of <i>N</i>
-Methyl- and <i>N</i>
-Alkylamines by Reductive Amination using Reusable Cobalt Oxide Nanoparticles
作者:Thirusangumurugan Senthamarai、Kathiravan Murugesan、Kishore Natte、Narayana V. Kalevaru、Helfried Neumann、Paul C. J. Kamer、Rajenahally V. Jagadeesh
DOI:10.1002/cctc.201701617
日期:2018.3.21
the synthesis and functionalization of amines by using earth‐abundant metal‐based catalysts is of scientific interest. In this regard, herein we report an expedient reductive amination process for the selective synthesis of N‐methylated and N‐alkylated amines by using nitrogen‐doped, graphene‐activated nanoscale Co3O4‐based catalysts. Starting from inexpensive and easily accessible nitroarenes or amines
N-甲基和N-烷基胺代表重要的精细化学品和散装化学品,已广泛用于学术研究和工业生产中。值得注意的是,这些结构基序存在于大量生命科学分子中,并在调节其活动中起着至关重要的作用。因此,通过使用富含地球的金属基催化剂开发一种方便,经济高效的胺合成和官能化方法的研究具有科学意义。在这方面,我们在此报告了一种便捷的还原胺化工艺,该工艺通过使用氮掺杂的石墨烯活化的纳米级Co 3 O 4选择性合成N-甲基化和N-烷基化的胺。基于催化剂。从廉价且易于获得的硝基芳烃或胺和甲醛水溶液或存在甲酸的甲酸开始,这种经济高效的还原胺化方案可合成各种N-甲基和N-烷基胺,氨基酸衍生物和现有药物分子。