Herein, we disclose a recyclable, hybrid manganese catalyst for site-selective azine C−H activation by weak amide assistance. The novel, reusablecatalyst enabled C3–H arylation and C3–H alkylation with ample scope, and was characterized by detailed transmission electron microscopy analysis.
Manganaelectro-Catalyzed Azine C–H Arylations and C–H Alkylations by Assistance of Weakly Coordinating Amides
作者:Leonardo Massignan、Cuiju Zhu、Xiaoyan Hou、João C. A. Oliveira、Aude Salamé、Lutz Ackermann
DOI:10.1021/acscatal.1c02516
日期:2021.9.17
Oxidative C–H functionalization has faced considerable limitations by the need for stoichiometric amounts of chemical oxidants. In sharp contrast, we herein present the merger of electrosynthesis with non-toxic manganese catalysis for oxidative C–H arylations and C–H alkylations with electricity as the terminal oxidant. Mechanistic experimental studies as well as cyclic voltammetry and scanning electron
Traceless Directing Group Assisted Cobalt-Catalyzed C−H Carbonylation of Benzylamines
作者:Fei Ling、Chongren Ai、Yaping Lv、Weihui Zhong
DOI:10.1002/adsc.201700780
日期:2017.11.10
The first example of cobalt‐catalyzed C(sp2)−H carbonylation of benzylamines using a traceless directing group is reported, which was successfully applied to the synthesis of N−unprotected iso‐indolinones through direct C−H/N−H bonds activation. This protocol tolerates a variety of functional groups and provides a facile and efficient method for the formal synthesis of (+)‐garenoxacin.
报道了使用无痕导向基团的钴催化苄胺的C(sp 2)-H羰基羰基化的第一个实例,该实例已成功地用于通过直接CH / H / NH键活化而合成N-未保护的异吲哚啉酮。该方案可耐受多种官能团,并为(+)-加仑沙星的正式合成提供了一种简便而有效的方法。
Iron-Catalyzed Directed C(sp<sup>2</sup>)–H and C(sp<sup>3</sup>)–H Functionalization with Trimethylaluminum
作者:Rui Shang、Laurean Ilies、Eiichi Nakamura
DOI:10.1021/jacs.5b04818
日期:2015.6.24
Conversion of a C(sp(2))-H or C(sp(3))-H bond to the corresponding C-Me bond can be achieved by using AlMe3 or its air-stable diamine complex in the presence of catalytic amounts of an inorganic iron(III) salt and a diphosphine along with 2,3-dichlorobutane as a stoichiometric oxidant. The reaction is applicable to a variety of amide substrates bearing a picolinoyl or 8-aminoquinolyl directing group
Manganese(II/III/I)-Catalyzed C–H Arylations in Continuous Flow
作者:Cuiju Zhu、João C. A. Oliveira、Zhigao Shen、Huawen Huang、Lutz Ackermann
DOI:10.1021/acscatal.8b00166
日期:2018.5.4
Versatile manganese-catalyzed C–H arylations on synthetically meaningful pyridines were accomplished with sustainable MnCl2 as the catalyst. The oxidative C–H functionalizations proved viable with a user-friendly and safe continuous flow setup by weak amide-assisted C–H cleavage via a facile C–H activation regime.