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
Facile synthesis of controllable graphene-co-shelled reusable Ni/NiO nanoparticles and their application in the synthesis of amines under mild conditions
作者:Jianguo Liu、Yuting Zhu、Chenguang Wang、Thishana Singh、Nan Wang、Qiying Liu、Zhibing Cui、Longlong Ma
DOI:10.1039/d0gc02421j
日期:——
catalysts are stable and reusable and were successfully used for the synthesis of primary, secondary, tertiary, and N-methylamines (more than 62 examples). The reaction couples easily accessible carbonyl compounds (aldehydes and ketones) with ammonia, amines, and H2 under very mild industrially viable and scalable conditions (80 °C and 1 MPa H2 pressure, 4 h), offering cost-effective access to numerous functionalized
Reductive amination of various ketones and aldehydes by transferhydrogenation under aqueous conditions has been developed, by using cyclometallated iridium complexes as catalysts and formate as hydrogen source. The pH value of the solution is shown to be critical for a high catalytic chemoselectivity and activity, with the best pH value being 4.8. In comparison with that in organic solvents, the reductive
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.
Alkyl formates as reagents for reductive amination of carbonyl compounds
作者:Oleg I. Afanasyev、Ilia Cherkashchenko、Anton Kuznetsov、Fedor Kliuev、Sergey Semenov、Olga Chusova、Gleb Denisov、Denis Chusov
DOI:10.1016/j.mencom.2020.01.037
日期:2020.1
Alkyl formates in the presence of basic additives can serve as a reagent in the direct reductive amination of carbonylcompounds. The developed procedure can be applied to various aldehydes and ketones with electron donating and electron withdrawing groups.