Lewis or Brønsted acid-catalysed reaction of propargylic alcohol-tethered alkylidenecyclopropanes with indoles and pyrroles for the preparation of polycyclic compounds tethered with indole or pyrrole motif
作者:Hao-Zhao Wei、Liu-Zhu Yu、Min Shi
DOI:10.1039/c9ob02211b
日期:——
derivatives via the Lewis or Brønsted acid catalysed cascade nucleophilic addition, electronic cyclization, ring-opening rearrangement of propargylic alcohol-tethered alkylidenecyclopropanes with indole and pyrrole derivatives. The reaction exhibited a broad substrate scope and good functional group tolerance under metal-free conditions, affording the desired products in moderate to good yields.
我们开发了一种简便的合成方法,该方法可通过路易斯或布朗斯台德酸催化的级联亲核加成,电子环化,带有炔丙基和吡咯衍生物的炔丙醇系链亚烷基环丙烷的开环重排来访问环戊五烯[ b ]萘衍生物。该反应在无金属的条件下表现出宽泛的底物范围和良好的官能团耐受性,以中等至良好的产率提供了所需的产物。
Rapid construction of cyclopenta[<i>b</i>]naphthalene frameworks from propargylic alcohol tethered methylenecyclopropanes
作者:Hao-Zhao Wei、Quan-Zhe Li、Yin Wei、Min Shi
DOI:10.1039/d0ob01732a
日期:——
We have developed a new synthetic methodology for the rapidconstruction of cyclopenta[b]naphthalene frameworks from the reaction of propargylic alcohol tethered methylenecyclopropanes with mesyl chloride in the presence of triethylamine through cascade cyclization. The reaction can be performed under mild conditions without the use of transition metals, affording the target products in moderate to
我们已经开发了一种新的合成方法,可以通过在三乙胺存在下通过级联环化反应,将炔丙醇系链的亚甲基环丙烷与甲磺酰氯反应,快速构建环戊[ b ]萘骨架。该反应可以在温和的条件下进行而无需使用过渡金属,以中等至良好的收率提供目标产物,并且该环化反应过程可以按比例放大至克级合成。
Chinazoline und 1,4-Benzodiazepine. VII. Mitteilung. Trifluormethyl-substituierte Verbindungen
作者:G. Saucy、L. H. Sternbach
DOI:10.1002/hlca.19620450657
日期:——
Several new o-amino-trifluoromethyl-benzophenones have been synthesized. Their conversion into 1,4-benzodiazepine derivatives is described.
A novel, one-pot, three-step synthetic method to prepare 2-aminobenzophenones from 2-alkynyl arylazides has been disclosed. This reaction is catalyzed by palladium to form 3-hydroxy-3-phenylindolin-2-ones, which is followed by hydrolysis of amide bonds and copper-catalyzed decarboxylation to generate 2-aminobenzophenones. The desired products are afforded in moderate to good yields under mild reaction
enantioselective borylative cyclization cascade utilizing cyclicimides has been developed. We employ a highly enantioselective borylcupration process that includes a 1,2-addition to a cyclicimide. The products contain a valuable hemiaminal and boronate handle for further elaborations within a congested framework. This work demonstrates the utility of cyclicimides as simple precursors to unlock access to sought-after