Synthesis and biophysical evaluation of arylhydrazono-1H-2-indolinones as β-amyloid aggregation inhibitors
摘要:
A series of isatin-3-arylhydrazones were synthesized and evaluated in vitro as inhibitors of A beta(1-40) aggregation using a thioflavin T fluorescence method. An exploration of the effects on A beta(1-40) aggregation of a number of diverse substituents at phenylhydrazone group and 5,6- positions of the indolinone nucleus led us to single out some new anti-aggregating compounds with IC50 values in the low micromolar range. The most active compounds carry methoxy- or hydroxy- substituents in the indolinone 5,6-positions and lipophilic groups such as iPr and Cl at 4'- and 3'-position, respectively, of the phenylhydrazone moiety. Two derivatives are noteworthy, namely 18 (IC50 = 0.4 mu M) and 42 (IC50 = 1.1 mu M). The in vitro effects of the highly active, water soluble, compound 42 on the temporal evolution of A beta(1-40) fibrils formation were further investigated by circular dichroism spectroscopy, transmission electron microscopy and dynamic light scattering studies, which clearly showed that this compound delayed and lowered the amyloid fibril formation. (C) 2010 Elsevier Masson SAS. All rights reserved.
ABSTRACT A simple, environmentally benign protocol for synthesis of hydrazones from carbonyl compounds and hydrazides has been developed in the presence of meglumine in aqueous-ethanol media at room temperature. The salient features of the present protocol are mild reaction conditions, short reaction time, high yields, operational simplicity, metal-free, applicability toward large-scale synthesis, and biodegradable
Indium(<scp>iii</scp>)-catalyzed efficient synthesis of 3-arylhydrazonoindolin-2-ones and their fluorescent metal sensing studies
作者:Shreedhar Devkota、Sonaimuthu Mohandoss、Yong Rok Lee
DOI:10.1039/d1nj05715d
日期:——
In(iii)-catalyzed strategy for the preparation of 3-arylhydrazonoindolin-2-ones from 3-diazoindoles is developed and used for Fe3+ and Hg2+ ion sensing.
An efficient C–N cross-coupling approach for the synthesis of hydrazones was developed through C(sp2)–H and C(sp3)–H functionalization of indole and methylarene under visible light irradiation using photocatalyst eosin Y, ethanol:water as a green solvent and atmospheric air as an oxidant. With the aid of eosin Y, the C–H bonds of indole and methylarenes were activated followed by coupling with arylhydrazines
method for accessing indole-based N-carboxamide derivatives by palladium-catalyzed isocyanideinsertion into the N−H bond of 3-(phenylhydrazono)oxindole is developed. Further, control experiments and Conceptual DFT calculation suggest that the 3-phenylhydrazone group plays a crucial role in remotely activating the N−H bond of oxindole derivatives. In addition, it has been observed that the reaction‘s outcome