Copper-Catalyzed Amino Lactonization and Amino Oxygenation of Alkenes Using <i>O</i>-Benzoylhydroxylamines
作者:Brett N. Hemric、Kun Shen、Qiu Wang
DOI:10.1021/jacs.6b02840
日期:2016.5.11
A copper-catalyzed amino lactonization of unsaturated carboxylic acids has been achieved as well as the analogous intermolecular three-component amino oxygenation of olefins. The transformation features mild conditions and a remarkably broad substrate scope, offering a novel and efficient approach to construct a wide range of amino lactones as well as 1,2-amino alcohol derivatives. Mechanistic studies
A Visible-Light-Mediated Oxidative CN Bond Formation/Aromatization Cascade: Photocatalytic Preparation of N-Arylindoles
作者:Soumitra Maity、Nan Zheng
DOI:10.1002/anie.201205137
日期:2012.9.17
Just add light and air: Structurally diverse N‐arylindoles can be prepared from readily prepared o‐styryl anilines through visible‐light photocatalysis. The reaction, which is conducted open to air, is mediated by [Ru(bpz)3](PF6)2 (bpz=2,2′‐bipyrazine) and involves both CNbondformation and aromatization (see scheme). Using suitably substituted substrates, a 1,2‐carbon shift can be also incorporated
只需添加光和空气:可以通过可见光光催化从容易制备的邻苯乙烯基苯胺制备结构多样的N-芳基吲哚。该反应在空气中进行,由 [Ru(bpz) 3 ](PF 6 ) 2 (bpz=2,2′-联吡嗪)介导,涉及 C N 键形成和芳构化(见方案)。使用适当取代的底物,1,2-碳转移也可以纳入该级联反应中。
Copper-Catalyzed Cascade Cyclization of Arylsulfonylhydrazones Derived from <i>ortho</i>-Alkynyl Arylketones: Regioselective Synthesis of Functionalized Cinnolines
作者:Biao Yao、Tao Miao、Wei Wei、Pinhua Li、Lei Wang
DOI:10.1021/acs.orglett.9b03134
日期:2019.12.6
A novel copper-catalyzed cascade reaction of arylsulfonylhydrazones derived from ortho-alkynyl arylketones was accomplished. This reaction provides concise access to diversified cinnolines in good yields. The mechanistic investigations have disclosed involvement of the key alkynyl amination, 1,4-aryl migration, desulfonylation, and diazo radical cyclization cascade in the transformation.
One-pot copper-catalyzed three-component reaction: a modular approach to functionalized 2-quinolones
作者:Ah Reum Kim、Hee Nam Lim
DOI:10.1039/d0ra01352h
日期:——
A copper-catalyzed three-component annulation for the synthesis of functionalized 2-quinolones was developed. Three reactions including an SN2, a Knoevenagel, and finally C–N bond formation are involved in the designed cascade reaction using 2-bromoacylarenes, 2-iodoacetamide, and nucleophiles as the three components. A new catalytic system was discovered during the study and this modular approach
开发了一种用于合成功能化 2-喹诺酮类的铜催化三组分环化。使用 2-溴代芳烃、2-碘乙酰胺和亲核试剂作为三个组分的设计级联反应涉及三个反应,包括 S N 2、Knoevenagel 和最后形成 C-N 键。研究期间发现了一种新的催化系统,这种模块化方法可以高效地获得功能化的 2-喹诺酮衍生物,与广泛的官能团兼容,可扩展且经济。所得产物的进一步衍生证明了该方法的合成效用。
Catalyst-Free Intramolecular Formal Carbon Insertion into σ-CC Bonds: A New Approach toward Phenanthrols and Naphthols
作者:Ying Xia、Peiyuan Qu、Zhenxing Liu、Rui Ge、Qing Xiao、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201209269
日期:2013.2.25
of carbonyl groups in keto aldehyde substrates has been exploited for the synthesis of phenanthrols, naphthols, and their heteroatom‐containing analogues. Key to this highly efficient and robust methodology is the catalyst‐free intramolecularformal diazo carboninsertion of N‐tosylhydrazones into keto CCbonds (see scheme).