Zn- and Cu-Catalyzed Coupling of Tertiary Alkyl Bromides and Oxalates to Forge Challenging C–O, C–S, and C–N Bonds
作者:Yuxin Gong、Zhaodong Zhu、Qun Qian、Weiqi Tong、Hegui Gong
DOI:10.1021/acs.orglett.0c04206
日期:2021.2.5
We describe here the facile construction of sterically hindered tertiary alkyl ethers and thioethers via the Zn(OTf)2-catalyzed coupling of alcohols/phenols with unactivated tertiary alkyl bromides and the Cu(OTf)2-catalyzed thiolation of unactivated tertiary alkyloxalates with thiols. The present protocol represents one of the most effective unactivated tertiary C(sp3)–heteroatom bond-forming conditions
Rapid access to <i>t</i>-butylalkylated olefins enabled by Ni-catalyzed intermolecular regio- and <i>trans</i>-selective cross-electrophile <i>t</i>-butylalkylation of alkynes
作者:Yi-Zhou Zhan、Huan Meng、Wei Shu
DOI:10.1039/d2sc00487a
日期:——
distinct alkyl bromides to afford olefins with two aliphatic substituents. The reductive conditions circumvent the use of organometallic reagents, enabling the cross-dialkylation process to occur at room temperature from two different alkyl bromides. This operationally simple protocol provides a straightforward and practical access to a wide range of stereodefined dialkylated olefins with broad functional
在炔烃的碳双官能化中,炔烃的立体选择性二烷基化是最具挑战性的转化,因为相关的竞争性副反应,因此仍然不发达。在此,我们报道了第一次 Ni 催化的炔烃与两种不同的烷基溴化物的区域选择性和反式选择性交叉二烷基化反应,得到具有两个脂肪族取代基的烯烃。还原条件避免了有机金属试剂的使用,使交叉二烷基化过程能够在室温下由两种不同的烷基溴进行。这种操作简单的协议提供了一种直接且实用的途径,可以从容易获得的起始材料中获得具有广泛官能团耐受性的各种立体定义的二烷基化烯烃。
Facile synthesis of α-tertiary alkyl/aryl amines via cu-catalyzed alkylation of indoles and anilines with tertiary alkyl bromides
作者:Gaoyu Duan、Qun Qian、Yunrong Chen
DOI:10.1016/j.tetlet.2023.154730
日期:2023.10
Methods of copper-catalyzed alkylation of indoles and anilines with tertiary alkyl bromides were reported. These protocols provided various N-tert-alkyl 3-substituted indoles and electron-deficient N-tert-alkyl anilines in moderate to good yields via CN coupling.
报道了铜催化吲哚和苯胺与叔烷基溴烷基化的方法。这些方案通过C N 偶联以中等至良好的产率提供了各种N-叔烷基3-取代吲哚和缺电子N-叔烷基苯胺。
Group 14 Elements Hetero‐Difunctionalizations via Nickel‐Catalyzed Electroreductive Cross‐Coupling
A nickel-catalyzed three-components reductive protocol for the group 14 elements hetero-difunctionalizations via electrochemistry is described. The cascade reaction proceeded smoothly with the diverse chlorosilanes, 1,3-enynes, primary, secondary, and tertiary alkyl bromides. Good chemo- and regioselectivities were achieved. This protocol could be extended to germanyl- and stannylalkylation of 1,3-enynes
Copper-Catalyzed Site-Selective Electrophilic Aromatic Alkylation of Monosubstituted Simple Arenes
作者:Wanting Fu、Jing Tian、Yuanli Ding、Xi Wang、Meiyan Wang、Zikun Wang
DOI:10.1021/acs.orglett.4c00475
日期:2024.4.5
A copper-catalyzed highly para-selective electrophilic aromatic alkylation of monosubstituted simple arenes has been accomplished. This method provides a practical platform for the transformation from simple commercial arenes to well-defined di- and multisubstituted aromatics with high added value. Control experiments and DFT calculations reveal that the achievement of the excellent site-selectivity