在本文中,提出了在有氧或无氧条件下通过Rh(III)催化的2-炔基苯胺的逐步二聚反应,空前选择性地合成吲哚[3,2- c ]喹啉或3-(2-氨基苯基)喹啉衍生物。值得注意的是,发现六氟异丙醇是这些反应成功的关键溶剂和促进剂。另外,如此获得的产物的实用性通过它们容易地转化成药学上和光物理上重要的萘啶衍生物而得以展示。
Cu(<scp>i</scp>) catalysis for selective condensation/bicycloaromatization of two different arylalkynes: direct and general construction of functionalized C–N axial biaryl compounds
enantioselectivity verifies its potential for the simplest asymmetric synthesis of atropoisomeric biaryls. Western blotting demonstrated that the newly developed compounds are promising targets in biology and pharmaceuticals. This unique reaction can construct structurally diverse C–N axial biarylcompounds that have never been reported by other methods, and might be extended to various applications in materials
Palladium-catalyzed <i>C</i>-glycosylation and annulation of <i>o</i>-alkynylanilines with 1-iodoglycals: convenient access to 3-indolyl-<i>C</i>-glycosides
作者:Jianchao Liu、Xiao Xiao、Puren Han、Huiwen Zhou、Qi-Shuang Yin、Jian-Song Sun
DOI:10.1039/d0ob01812k
日期:——
2-glycosides through a palladium-catalyzed annulation/C-glycosylation sequence of o-alkynylanilines with 1-iodoglycals has been developed. This methodology has a wide scope of substrates and gives access to 3-indolyl-C-Δ1,2-glycosides in high yields. Furthermore, the product obtained here exhibits a high utility for further transformations.
Visible-Light-Mediated [2+2+1] Carbocyclization Reactions of 1,7-Enynes with Bromofluoroacetate to Form Fused Monofluorinated Cyclopenta[<i>c</i>]quinolin-4-ones
作者:Yi Qu、Wentao Xu、Jingjing Zhang、Yuxiu Liu、Yongqiang Li、Hongjian Song、Qingmin Wang
DOI:10.1021/acs.joc.0c00087
日期:2020.4.17
Herein, we describe a new protocol for photoinduced radical [2+2+1] carbocyclization reactions of 1,7-enynes with bromofluoroacetate. These reactions, which proceed via a cascade involving fluoroalkylation, 6-exo-dig and 5-endo-trig cyclizations, H-transfer step, and oxidative dehydrogenation, provide an efficient and general route to a variety of fused monofluorinated cyclopenta[c]quinolin-4-one derivatives
addition-cyclization reactions of various 2-alkynylbenzenamines with CS2 lead to the formation of 2-mercapto-4-benzylidene-4H-benzo[d][1,3]thiazines under mild conditions. The reactions showed moderate to excellent yields and were highly regiospecific, and only the six-membered ring was generated via 6-exo-dig S-cyclization. The reaction can be transferred to highly functionalized 4-benzylidene-4H-benzo[d][1
在温和条件下,各种2-炔基苯甲胺与CS 2的串联加成环化反应导致形成2-巯基-4-亚苄基-4 H-苯并[ d ] [1,3]噻嗪。反应显示出中等至优异的产率,并且具有高度区域特异性,并且仅通过6- exo -dig S-环化生成六元环。该反应可通过CuI催化的交叉偶联和还原偶联反应转移至高度官能化的4-亚苄基-4 H-苯并[ d ] [1,3]噻嗪。