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
Cp*Co<sup>III</sup>-catalyzed formal [4+2] cycloaddition of benzamides to afford quinazolinone derivatives
作者:Jingshu Yang、Xiao Hu、Zijie Liu、Xueyuan Li、Yi Dong、Gang Liu
DOI:10.1039/c9cc07173c
日期:——
A Cp*CoIII-catalyzed arene C–H bond amidation/annulation of benzamides was developed to afford quinazolinone derivatives in one-pot with high yields and broad substrate scope. This method could be applied to the synthesis of quinazolinone drugs and late-stage modification of natural products.
开发了一种由Cp * Co III催化的苯甲酰胺C / H键酰胺化/环化反应,可一锅制得喹唑啉酮衍生物,并具有高收率和广泛的底物范围。该方法可用于喹唑啉酮类药物的合成和天然产物的后期修饰。
Ruthenium(<scp>ii</scp>)-catalyzed amide directed spiroannulation with naphthoquinones: access to spiro-isoindolinone frameworks
作者:Suman Dana、Chandan Kumar Giri、Mahiuddin Baidya
DOI:10.1039/d0cc05438k
日期:——
A mild ruthenium(ii)-catalyzed spiroannulation between benzamides and naphthoquinones is developed for the succinct synthesis of biologically relevant spiro-isoindolinone scaffolds.
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。