Rh(<scp>iii</scp>)-catalyzed synthesis of tetracyclic isoquinolinium salts <i>via</i> C–H activation and [4+2] annulation of 1-phenyl-3,4-dihydroisoquinolines and alkynes in ethanol
作者:Xinxin Dang、Yu He、Yingtian Liu、Xuehong Chen、Jun-Long Li、Xian-Li Zhou、Hezhong Jiang、Jiahong Li
DOI:10.1039/c8ra05443f
日期:——
An efficient and convenient method to construct tetracyclic isoquinolinium salts via [Cp*RhCl2]2 catalyzed C–H activation and [4 + 2] annulationreactions in ethanol is described. This reaction is very fast and highly efficient in the green solvent ethanol. The reaction works with a broad substrate scope affording the products in good to excellent yields in a short time. Moreover, a ratio of S/C up
The preparation of eleven novel 6,7-dimethoxy-1-[(ortho, and para-R)-phenyl]-3,4-dihydroisoquinolines with possible pharmacological activity is described. The structure of all products was corroborated by ir, 1H-nmr, 13C-nmr, and ms.
Strategies and Synthetic Methods Directed Toward the Preparation of Libraries of Substituted Isoquinolines
作者:Emelia Awuah、Alfredo Capretta
DOI:10.1021/jo100980p
日期:2010.8.20
Strategies for the production of substituted isoquinoline libraries were developed and explored. Routes involving microwave-assisted variants of the Bischler−Napieralski or Pictet−Spengler reaction allowed for cyclization of substituted β-arylethylamine derivatives. The dihydroisoquinolines and tetrahydroisoquinolines thus generated could then be oxidized to their corresponding isoquinoline analogues
The reaction between 1-aryl-3,4-dihydroisoquinolines and monocyclic anhydrides was studied for the first time. The method is the first one-step route to previously unknown angularly-aryl substituted racemic [1,4]thiazino[3,4-a]isoquinoline derivatives with trans configuration. It was found that electron-withdrawing substituents in the p-position of the aryl group in the starting 3,4-dihydroisoquinoline
首次研究了1-芳基-3,4-二氢异喹啉与单环酸酐的反应。该方法是获得以前未知的具有反式构型的角芳基取代外消旋 [1,4] 噻嗪并 [3,4-a] 异喹啉衍生物的第一个单步路线。研究发现,起始 3,4-二氢异喹啉中芳基对位的吸电子取代基导致更高的产率和更短的反应时间,这与之前对高邻苯二甲酸酐和类似无环 N 反应的观察结果相反-芳基甲胺。
Barker, John M.; Huddleston, Patrick R.; Clephane, Janette, Journal of the Chemical Society. Perkin transactions I, 1985, p. 275 - 282
作者:Barker, John M.、Huddleston, Patrick R.、Clephane, Janette、Wood, Michael L.、Holmes, David