Exploiting the Distal Reactivity of Indolyl Methylenemalononitriles: An Asymmetric Organocatalyzed [4+2] Cycloaddition with Enals Enables the Assembly of Elusive Dihydrocarbazoles
generation of indolyl ortho‐quinodimethanes from 2‐methylindole‐based methylenemalononitriles by amine‐mediated remote C(sp3)−H deprotonation was developed. These intermediates were efficiently trapped by diverse enals to provide a rapid entry to 2,9‐dihydro‐1H‐carbazole‐3‐carboxyaldehyde structures through a formal asymmetric [4+2] eliminative cycloaddition governed by a α,α‐diphenylprolinol trimethylsilyl
Synthesis of Some Novel 3-Substituted Indole Derivatives Using Polyamine Functionalized Heterogeneous Catalyst
作者:Rupali L. Magar、Prashant B. Thorat、Jagdish L. Waware、Rameshwar R. More、Usha A. Solanke、Bhagwan R. Patil、Rajendra P. Pawar
DOI:10.1002/jhet.2265
日期:2015.11
have described the use of polyamine solid supported GN3 as catalyst in organic transformations using 1H‐indole‐3‐carbaldehyde. To the best of our knowledge, reports for the synthesis of chromen substituted at 3C position of indole are extremely rare in the literature. The polyamine functionalized immobilized silica (GN3) was found to be an excellent catalyst for synthesis of novel 2‐amino‐4‐(1H‐indol‐3‐yl)‐5‐oxo‐4
在目前的工作中,我们已经描述了使用多胺固体负载的GN3作为催化剂使用1 H-吲哚-3-甲醛进行有机转化。据我们所知,在文献中极少见有吲哚的3C位取代的铬烯合成报告。发现多胺官能化的固定化二氧化硅(GN3)是合成新型2-氨基-4-((1 H-吲哚-3-基)-5-氧代-4,5-二氢吡喃[3,2- c ]色烯-3-腈衍生物和Knoevenagel缩合。催化剂GN3能够为多种产品提供出色的产量。此外,该催化剂可重复使用并重复使用几次,而不会损失其催化活性。
A Short, Novel, and Practical Synthesis of 3-Alkenylated Indoles
Abstract Direct metal-free alkenylation of 2-methylindole via acid-mediated Michael addition–elimination reaction with ethoxymethylenemalononitrile or ethyl ethoxymethylenecyanoacetate affords 3-indolyl-2-cyanoacrylonitrile and ethyl 3-indolyl-2-cyanoacrylate. Behavior of 1H-indole is predictably different. GRAPHICAL ABSTRACT
Unconventional Knoevenagel-type indoles: Synthesis and cell-based studies for the identification of pro-apoptotic agents
作者:Andrea Spallarossa、Chiara Caneva、Matteo Caviglia、Silvana Alfei、Stefania Butini、Giuseppe Campiani、Sandra Gemma、Margherita Brindisi、Daniela M. Zisterer、Sandra A. Bright、Clive D. Williams、Emmanuele Crespan、Giovanni Maga、Giuseppina Sanna、Ilenia Delogu、Gabriella Collu、Roberta Loddo
DOI:10.1016/j.ejmech.2015.08.009
日期:2015.9
A new series of indole-based analogues were recently identified as potential anticancer agents. The Knoevenagel-type indoles herein presented were prepared via a one-pot condensation of iminium salts with active methylene reagents and were isolated as single geometric isomers. Biological evaluation in different cell-based assays revealed an antiproliferative activity for some analogues already in the nanomolar range against leukaemia, breast. and renal cancer cell lines. To explain these effects, the most promising analogues of the series were engaged in further cell-based studies. Compounds 5e, I, p and 6a, b highlighted a pro-apoptotic potential being able to induce apoptosis in HL60, K562 and MCF-7 cell lines in a dose and time-dependent manner. The ability of these compounds to arrest cell cycle at the G2/M phase inspired the immunofluorescence studies which allowed us to identify tubulin as a potential target for compounds 5l and 6b. (C) 2015 Elsevier Masson SAS. All rights reserved.