Phosphine-Free Well-Defined Mn(I) Complex-Catalyzed Synthesis of Amine, Imine, and 2,3-Dihydro-1<i>H</i>-perimidine via Hydrogen Autotransfer or Acceptorless Dehydrogenative Coupling of Amine and Alcohol
report the synthesis of amines/imines directly from alcohol and amines via hydrogen autotransfer or acceptorless dehydrogenation catalyzed by well-defined phosphine-free Mn complexes. Both imines and amines can be obtained from the same set of alcohols and amines using the same catalyst, only by tuning the reaction conditions. The amount and nature of the base are found to be a highly important aspect for
Iron-Catalyzed Oxidative Amination of Benzylic C(sp<sup>3</sup>)–H Bonds with Anilines
作者:Yan-Ling Song、Bei Li、Zhen-Biao Xie、Dan Wang、Hong-Mei Sun
DOI:10.1021/acs.joc.1c02311
日期:2021.12.17
Iron-catalyzed oxidative amination of benzylic C(sp3)–H bonds with anilines bearing electron-withdrawing groups (EWGs) or electron-donating groups (EDGs) is realized based on simple variations of N-substituents on imidazolium cations in novel ionic Fe(III) complexes. The structural modification of the imidazolium cation resulted in regulation of the redox potential and the catalytic performance of
基于新型离子 Fe 中咪唑鎓阳离子上 N 取代基的简单变化,实现了苄基 C(sp 3 )-H 键与带有吸电子基团 (EWG) 或供电子基团 (EDG) 的苯胺的铁催化氧化胺化(三)配合物。咪唑鎓阳离子的结构改性导致氧化还原电位和铁金属中心催化性能的调节。使用DTBP作为氧化剂,[HI t Bu][FeBr 4 ]对带有EWG的苯胺表现出最高的催化活性,而[HIPym][FeBr 4 ]对EDG取代的苯胺更有效。这项工作为苄胺提供了替代途径,同时具有广泛的底物范围和铁催化的优点。
Disclosed is a method for preparing a benzyl amine compound, i.e., synthesizing a benzyl amine compound by means of an oxidation reaction between a methylbenzene/ethylbenzene compound and arylamine by using an ionic iron (III) complex containing 1,3-di-tert-butylimidazolium cation and having a molecular formula of [(RNCHCHNR)CH][FeBr
4
] (R being tert-butyl) and di-t-butyl peroxide as an oxidant. The present invention is not only applicable to a methylbenzene compound containing a benzylic primary carbon-hydrogen bond but also applicable to an ethylbenzene compound containing a benzylic secondary carbon-hydrogen bond, and therefore is widely applicable. This is the first case where the preparation of a benzyl amine compound by means of an oxidation reaction between a methylbenzene/ethylbenzene compound and arylamine is implemented by an iron catalyst.