2-Aryl-3H-indol-3-ones: Synthesis, electrochemical behaviour and antiplasmodial activities
摘要:
The synthesis of indolone derivatives and their antiplasmodial activity in vitro against Plasmodium falciparum at the blood stage are described. The 2-aryl-3H-indol-3-ones were synthesized via deoxygenation of indolone-N-oxides. Electrochemical behaviour, antiplasmodial activity and cytotoxicity on human tumor cell lines were compared to those of indolone-N-oxides. The antiplasmodial IC50 (concentrations at 50% inhibition) of these compounds ranged between 49 and 1327 nM. Among them, the 2(4-dimethylaminophenyl)-5-methoxy-indol-3-one, 7, had the best antiplasmodial activity in vitro (IC50 = 49 nM; FcB1 strain) and selectivity index (SI (CC50 MCF7/IC50 FcB1) = 423.4). Thus, the hits identified in this deoxygenated series correspond to their structural homologs in the N-oxide series with comparable electrochemical behaviour at the nitrogen-carbon double bond. (C) 2014 Elsevier Masson SAS. All rights reserved.
Multi-site cyclization via initial C–H activation using a rhodium(<scp>iii</scp>) catalyst: rapid assembly of frameworks containing indoles and indolines
Tandem multi-site cyclization triggered by Rh(iii)-catalyzed C–H activation has been achieved for highly efficient synthesis of spirocycle indolin-3-one (C2-cyclization), benzo[a]carbazole (C3-cyclization) and an unusual indoxyl core (N1-cyclization).
An asymmetric normal-electron-demand aza-Diels–Alder cycloaddition of 2-aryl-3H-indol-3-ones and 2,4-dienals was explored via trienaminecatalysis of a chiral secondary amine. Multifunctional tricyclic polyhydropyrido[1,2-a]indoles were efficiently constructed in good stereoselectivity (up to 92% ee, >19 : 1 dr).
通过三烯胺催化手性仲胺探索了2-芳基-3 H-吲哚-3-酮和2,4-二烯的不对称正电子需求的氮杂-Diels-Alder环加成反应。多功能三环多氢吡啶并[1,2- a ]吲哚以良好的立体选择性(高达92%ee,> 19:1 dr)被有效地构建。
Chiral phosphoric acid-catalyzed direct asymmetric mannich reaction of cyclic<i>C</i>-acylimines with simple ketones: facile access to C2-quaternary indolin-3-ones
作者:Jin-Shan Li、Yong-Jie Liu、Shen Li、Jun-An Ma
DOI:10.1039/c8cc05125a
日期:——
A chiral Brønsted acid-catalyzed directasymmetric Mannich reaction of simple ketones with cyclic C-acylimines has been established for the synthesis of C2-quaternary indolin-3-ones. In the presence of 5–10 mol% chiral phosphoric acid, a series of 2-(2-oxo-2-phenylethyl)-2-arylindolin-3-ones were obtained in good to high yield with up to 99% ee. The adducts obtained could be readily converted into
建立了手性布朗斯台德酸催化的简单酮类与环状C-酰基亚胺的直接不对称曼尼希反应,用于合成C2-季吲哚-3-酮。在5-10 mol%手性磷酸的存在下,以高达99%ee的良好或高收率获得了一系列2-(2-氧代-2-苯基乙基)-2-芳基吲哚-3-酮。通过简单的修饰,可以容易地将获得的加合物转化为二氢吲哚,三环吲哚-3-酮和四环四氢吲哚并[1,2- a ]喹啉。
The enantioselective ketimine-ene reaction is one of the most challenging stereocontrolled reaction types in organic synthesis. In this work, catalytic enantioselective ketimine-ene reactions of 2-aryl-3H-indol-3-ones with α-methylstyrenes were achieved by utilizing a B(C6 F5 )3 /chiralphosphoricacid (CPA) catalyst. These ketimine-ene reactions proceed well with low catalyst loading (B(C6 F5 )3