Redox-Neutral [4 + 2] Annulation of <i>N</i>-Methoxybenzamides with Alkynes Enabled by an Osmium(II)/HOAc Catalytic System
作者:Jian Yang、Liexin Wu、Huiying Xu、Hui Gao、Zhi Zhou、Wei Yi
DOI:10.1021/acs.orglett.9b03827
日期:2019.12.20
C-H activation strategy, an efficient osmium(II)-catalyzed redox-neutral [4 + 2] annulation of N-methoxybenzamides with alkynes has been accomplished. Computational and experimental studies revealed that such transformation leading to the synthesis of the isoquinolone core might follow an Os(II)-Os(IV)-Os(II) catalytic pathway, in which an unusual HOAc-assisted oxidative addition of osmium(II) into
Ruthenium-Catalyzed Isoquinolone Synthesis through CH Activation Using an Oxidizing Directing Group
作者:Bin Li、Huiliang Feng、Shansheng Xu、Baiquan Wang
DOI:10.1002/chem.201102445
日期:2011.11.4
The oxidant directs: A mild, practical, efficient, and regioselective Ru‐catalyzed isoquinolone synthesis with a broad substrate scope was reported (see scheme). In this redox neutral process, the aromatic CH bond functionalization can be performed at room temperature without using any external oxidant. The mechanism of the reaction was probed, and it was found that CH activation is the turnover‐limiting
The cyclization of substituted N‐methoxy benzamides with alkynes in the presence of an easily affordable cobalt complex and NaOAc provides isoquinolone derivatives in good to excellent yields. The cyclization reaction is compatible with a range of functional group‐substituted benzamides, as well as ester‐ and alcohol‐substituted alkynes. The cobalt complex [CoIIICp*(OR)2] (R=Me or Ac) serves as an
在容易负担得起的钴络合物和NaOAc的存在下,用炔烃将取代的N-甲氧基苯甲酰胺环化,可以提供高至优异收率的异喹诺酮衍生物。环化反应与各种官能团取代的苯甲酰胺以及酯和醇取代的炔烃兼容。钴配合物[Co III Cp *(OR)2 ](R = Me或Ac)可作为有效的环化反应催化剂。后来,在POCl 3或PBr 3的存在下,异喹诺酮衍生物以极高的收率转化为1-氯和1-溴取代的异喹啉衍生物。
Palladium-Catalyzed Oxidative Cyclocarbonylation of Isoquinolones with CO via C−H/N−H Bond Cleavage: Easy Access to Isoindolo[2,1-<i>b</i>
]isoquinoline-5,7-dione Derivatives
作者:Shenghai Guo、Fang Wang、Lincong Sun、Xinying Zhang、Xuesen Fan
DOI:10.1002/adsc.201800347
日期:2018.7.4
An efficient and practical synthesis of isoindolo[2,1‐b]isoquinoline‐5,7‐diones through Pd‐catalyzed C−H activation/carbonylative annulation of isoquinolones with CO (1 atm) is presented. Deuterium‐labeling experiments revealed that the aryl C(sp2)−H bondactivation might be the rate‐determining step. More interestingly, the title compounds could also be prepared directly from the cascade reaction
提出了一种通过Pd催化的CH活化/异喹啉酮与CO(1 atm)羰基环化反应有效合成异吲哚并[2,1 – b ]异喹啉-5,7-二酮的方法。氘标记实验表明,芳基C(sp 2)-H键的活化可能是决定速率的步骤。更有趣的是,标题化合物也可以直接由N-甲氧基苯甲酰胺和内部炔烃(作为异喹诺酮的前体)在一氧化碳的大气压下,通过Rh / Pd中继催化,以用户友好的方式级联反应制备。。
Diversity-Oriented Synthesis through Rh-Catalyzed Selective Transformations of a Novel Multirole Directing Group
作者:Bo Su、Jiang-bo Wei、Wen-lian Wu、Zhang-jie Shi
DOI:10.1002/cctc.201500410
日期:2015.9.14
functionalization, directing‐group strategy was developed for the improvement of chemical reactivity and selectivity. Recently, to avoid the inherent limitations of traditional mono‐role directinggroups, a dual‐role oxidizing‐directing‐group strategy was developed, in which the directinggroup acts both as directinggroup and oxidant. Herein, we report a multiroledirectinggroup, which possesses multiple