General and Mild Nickel-Catalyzed Cyanation of Aryl/Heteroaryl Chlorides with Zn(CN)<sub>2</sub>: Key Roles of DMAP
作者:Xingjie Zhang、Aiyou Xia、Haoyi Chen、Yuanhong Liu
DOI:10.1021/acs.orglett.7b00732
日期:2017.4.21
A new and general nickel-catalyzed cyanation of hetero(aryl) chlorides using less toxic Zn(CN)2 as the cyanidesource has been developed. The reaction relies on the use of inexpensive NiCl2·6H2O/dppf/Zn as the catalytic system and DMAP as the additive, allowing the cyanation to occur under mild reaction conditions (50–80 °C) with wide functional group tolerance. DMAP was found to be crucial for successful
已经开发了一种新的且一般的镍催化的杂(芳基)氯化物氰化方法,该方法使用毒性较小的Zn(CN)2作为氰化物源。该反应依赖于使用廉价的NiCl 2 ·6H 2 O / dppf / Zn作为催化体系,并使用DMAP作为添加剂,从而使氰化反应在温和的反应条件下(50–80°C)发生,且具有宽泛的官能团耐受性。发现DMAP对于成功转化至关重要,并且基于机理研究,该反应可能通过Ni(0)/ Ni(II)催化进行。该方法也成功地扩展到了芳基溴化物和芳基碘化物。
Cobalt‐Catalyzed C8‐Dienylation of Quinoline‐
<i>N</i>
‐Oxides
作者:Rahul K. Shukla、Akshay M. Nair、Salman Khan、Chandra M. R. Volla
DOI:10.1002/anie.202003216
日期:2020.9.21
An efficient Cp*CoIII‐catalyzed C8‐dienylation of quinoline‐N‐oxides was achieved by employing allenes bearing leaving groups at the α‐position as the dienylating agents. The reaction proceeds by CoIII‐catalyzed C−H activation of quinoline‐N‐oxides and regioselective migratory insertion of the allene followed by a β‐oxy elimination, leading to overall dienylation. Site‐selective C−H activation was
喹啉N-氧化物的有效Cp * Co III催化C8-二烯基化反应是通过使用在α-位带有离去基团的烯作为二烯化剂来实现的。该反应通过Co III催化喹啉N氧化物的CH H活化和丙二烯的区域选择性迁移插入,然后被β氧基消除而进行,从而导致整体二烯化。在温和的反应条件下,以优异的选择性实现了位点选择性的CH活化,并且发现30 mol%的NaF添加剂对于有效的二烯基化至关重要。该方法具有高立体选择性,温和的反应条件和良好的官能团耐受性。喹啉N的C8烯基化在没有离开基团作为偶联配偶体的丙二烯的情况下实现了氧化。此外,进行了克级制备和初步的机理实验,以深入了解反应机理。
Rh(III)-catalyzed C8 arylation of quinoline N-oxides with arylboronic acids
作者:Yuanqiong Huang、Xueli Lv、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1016/j.cclet.2019.11.028
日期:2020.6
Abstract Herein, we report the first RhIII-catalyzed regioselective C8 arylation of quinoline N-oxides with commercially available arylboronic acids as coupling partners. This procedure is simple, and the reaction shows perfect regioselectivity, a broad substrate scope, and isolated yields of up to 92%. We demonstrate the utility of the reaction by using it for late-stage functionalization of a fungicide
Cp*Co(III)-Catalyzed Selective C8-Olefination and Oxyarylation of Quinoline <i>N</i>-Oxides with Terminal Alkynes
作者:Diksha Parmar、Ankit Kumar Dhiman、Rohit Kumar、Akhilesh K. Sharma、Upendra Sharma
DOI:10.1021/acs.joc.2c00752
日期:2022.7.15
oxyarylation of quinoline N-oxides with terminal alkynes. The selectivity for C8-olefination and oxyarylation is sterically and electronically controlled. In the case of quinoline N-oxides (unsubstituted at the C2 position), only the olefination product was obtained irrespective of the nature of the alkynes. In contrast, oxyarylation was observed exclusively when 2-substituted quinoline N-oxides were reacted with