Synthesis and Antiplasmodial Activity of New Indolone N-Oxide Derivatives
摘要:
A series of 66 new indolone-N-oxide derivatives was synthesized with three different methods. Compounds were evaluated for in vitro activity against CQ-sensitive (3D7), CQ-resistant (FcB1), and CQ and pyrimethamine cross-resistant (K1) strains of Plasmodium falciparum (P.f.), its well as for cytotoxic concentration (CC50) on MCF7 and KB human tumor Cell lines. Compound 26 (5-methoxy-indolone-N-oxide analogue) had the most potent antiplasmodial activity in vitro (< 3 nM on FcB1 and = 1.7 nM on 3D7) with a very satisfactory selectivity index (CC50 MCF7/IC50 FcB1: 14623; CC50 KB/IC50 3D7: 198823). In in vivo experiments, compound 1 (dioxymethylene derivatives of the indolone-N-oxide) showed the best antiplasmodial activity against Plasmodium berghei, 62% inhibition of the parasitaemia at 30 mg/kg/day.
N-Heterocyclic Carbene-Catalyzed Umpolung Formal [3+3] Cycloaddition of Enals with Isatogens: Access to Fused Indolin-3-ones with a Tetrasubstituted Carbon Stereocenter
作者:Junyu Xu、Shihe Hu、Yingyan Lu、Ying Dong、Weifang Tang、Tao Lu、Ding Du
DOI:10.1002/adsc.201401070
日期:2015.3.23
A novel synthetic method to accessfused indolin‐3‐ones with a tetrasubstitutedcarbonstereocenter has been developed via NHC‐catalyzed umpolungformal [3+3] cycloaddtion of enals with isatogens. This methodology could be also applied for the quick construction of the 6‐5‐5 tricyclic pyrrolo[1,2‐a]indole skeleton which is frequently found as a core structure of many indole alkaloids.
The enantioselectiveredoxannulation of nitroalkynes with indoles is enabled by gold/chiral phosphoric acid dualcatalysis. A range of indolin‐3‐one derivatives bearingquaternarystereocenters at the C2 position were afforded in good yields and excellent enantioselectivities (up to 96 % ee) from readily available starting materials.
Low-Valent Tungsten-Catalyzed Controllable Oxidative Dehydrogenative Coupling of Anilines
作者:Xingwei Cai、Yang Shen、Wei Li、Wentao Zhan、Fanjun Zhang、Chen Xu、Heng Song
DOI:10.1021/acs.orglett.2c04090
日期:2023.1.13
tungsten-catalyzed homogeneous system for oxidative dehydrogenative coupling of anilines to selectively produce various azoaromatics and azoxyaromatics as well as 2-substituted indolone N-oxides by simply regulating the reaction solvent with peroxide as a terminal oxidant under additive-free conditions. These findings provide an experimental framework for exploring tungsten catalysis in organic synthesis and offer
Rh(III)-catalyzed C7-alkylation of isatogens (indolin-3-one N-oxides) with malonicacid diazoesters has been developed. This strategy utilizes oxygen anion on the N-oxide group of isatogens as a directing group and successfully achieves the synthesis of a series of C7-alkylated isatogens with moderate to good yields (48–86% yields). Moreover, the N-oxides of isatogens can not only serve as the simple