报道了在氧化条件下使用(二乙酰氧基碘)苯和K 2 S 2 O 8的组合,从N-吡啶基吲哚空前合成稠合的喹唑啉酮的报道。该反应是无金属的,具有广泛的底物范围,操作简单且反应时间短,并且以中等至高产率提供了11 H-吡啶并[2,1 - b ]喹唑啉-11酮衍生物。据信它是通过原位生成的2-羟基-1-(吡啶-2-基)吲哚-3-酮作为关键反应中间体进行的,该中间体经历CC键裂解产生亲电C-3位点在N-吡啶基吲哚中。吡啶氮随后的亲核攻击导致其环化。
Cp * Co III催化的1-(吡啶-2-基)-1 H-吲哚与内部炔烃的C2选择性C–H链烯基化/环化级联转化,可得到吡啶基[2',1':2,3]介绍了嘧啶基[1,6- a ]吲哚-5-鎓。此外,可以通过还原反应,有效地构建6,7-二氢-4 H-吡啶基[2',1':2,3]嘧啶基[1,6- a ]吲哚,一种新型的功能化的N稠合吲哚核杂环。NaBH 4引发吡啶并[2',1':2,3]嘧啶并[1,6 - a ]吲哚-5-鎓。
Oxazolinyl-Assisted C–H Amidation by Cobalt(III) Catalysis
作者:Ruhuai Mei、Joachim Loup、Lutz Ackermann
DOI:10.1021/acscatal.5b02661
日期:2016.2.5
Cobalt-catalyzed C–H activation by means of oxazolinyl assistance set the stage for versatile direct amidations with ample substrate scope. Thus, a high-valent cobalt(III) catalyst enabled C–H amidations with excellent levels of positional and chemo-selectivities. Mechanistic studies provided strong support for a kinetically relevant C–H functionalization.
Cp*Co(III)-Catalyzed Enantioselective Hydroarylation of Unactivated Terminal Alkenes via C–H Activation
作者:Yan-Hua Liu、Pei-Pei Xie、Lei Liu、Jun Fan、Zhuo-Zhuo Zhang、Xin Hong、Bing-Feng Shi
DOI:10.1021/jacs.1c08562
日期:2021.11.17
we reported a Cp*Co(III)-catalyzed asymmetric hydroarylation of unactivated aliphatic terminal alkenes assisted by a new type of tailor-made amino acid ligands. Critical to the chiral induction was the engaging of a novel noncovalent interaction (NCI), which has seldomly been disclosed in the C–H activation area, arising from the molecular recognition among the organocobalt(III) intermediate, the coordinated
Copper‐Catalyzed Aerobic Oxidation of N‐Pyridylindole Leading to Fused Quinazolinones
作者:Yaqing Ye、Yuanyuan Yue、Xiaohui Guo、Junli Chao、Yan Yang、Chunying Sun、Qingzhang Lv、Jianming Liu
DOI:10.1002/ejoc.202100618
日期:2021.7.15
and aerobicoxidation of N-pyridylindole. This approach can be performed by copper(II)/air system to deliver the desired quizolinone. A series of substituted N-pyridylindoles were appropriate substrate to furnish this transformation. Mechanistically, the single-electron-transfer oxidation, the capture of molecular oxygen and the extrusion of carbon monoxide were involved in the aerobicoxidation of
A versatile manganese(I) catalyst was employed in CH aminocarbonylation reactions of heteroarenes with aryl as well as with alkyl isocyanates using a removable directing group approach. Detailed experimental mechanistic studies were suggestive of an organometallic CH manganesation step, followed by a rate‐determining migratory insertion.
Enantioselective Cobalt(III)‐Catalyzed C−H Activation Enabled by Chiral Carboxylic Acid Cooperation
作者:Fabio Pesciaioli、Uttam Dhawa、João C. A. Oliveira、Rongxin Yin、Michael John、Lutz Ackermann
DOI:10.1002/anie.201808595
日期:2018.11.19
The enantioselective cobalt(III)‐catalyzed C−H alkylation was achieved through the design of a novel chiral acid. The cobalt(III)‐catalyzed enantioselective C−H activation was characterized by high position‐, regio‐ and enantio‐control under exceedingly mild reaction conditions. Thereby, the robust cooperative cobalt(III) catalysis proved tolerant of valuable electrophilic functional groups, including