Protective effect of novel substituted nicotine hydrazide analogues against hypoxic brain injury in neonatal rats via inhibition of caspase
摘要:
In hypoxic-ischemic injury of the brain of neonates, the level of caspase-3 was found to be aberrantly activated. Its overexpression leads to the alteration of cytoskeleton protein fodrin and loss of DNA repair enzyme which ultimately results in neurological impairment and disability. Concerning this, the present study was intended to develop novel nicotine hydrazide analogues as caspase inhibitors via efficient synthetic route. These compounds were subsequently tested for inhibitory activity against caspase-3 and -7 where they exhibit highly potent activity against caspase-3 revealing compound 5k as most potent inhibitor (IC50 = 19.4 +/- 2.5 mu M). In Western blot analysis, 5k considerably inhibits the overexpression of caspase-3. The aryl nicotinate of compound 5k, as indicated by molecular docking was found to engage His121 and critical enzyme thiols, i.e., Cys163 of caspase-3 for its potent activity. Moreover, histopathological examination of brain tissues and hippocampus neurons showed that compound 5k considerably improves the brain injury and exert neuroprotective effects in hypoxic-ischemic (HI). In brain homogenate, 5k significantly improves the activity of MDA, SOD, GSH-Px, CAT and T-AOC to exert its beneficial effect against oxidative stress induced by HI injury. (C) 2016 Elsevier Ltd. All rights reserved.
Microwave-assisted regioselective one-pot synthesis of trisubstituted pyridine scaffolds using K<sub>5</sub>CoW<sub>12</sub>O<sub>40</sub>.3H<sub>2</sub>O under solvent free conditions
作者:Srinivas Kantevari、Mahankhali Venu Chary、Srinivasu V. N. Vuppalapati、N. Lingaiah
DOI:10.1002/jhet.5570450424
日期:2008.7
A highly efficient, microwave-assisted, regioselectivesynthesis of 2,3-disubstituted-6-arylpyridines and new series of 7,7-dimethyl-2-aryl-5,6,7,8-tetrahydroquinoline-5-ones from enaminones in the presence of K5CoW12O40.3H2O (1.0 mol %) as heterogeneous catalyst undersolventfreeconditions is reported.
高效的微波辅助区域选择性合成的2,3-二取代的6-芳基吡啶和新的7,7-二甲基2-芳基5,6,7,8-四氢喹啉5-酮从氨基酮中合成。据报道在无溶剂条件下存在K 5 CoW 12 O 40 .3H 2 O(1.0 mol%)作为非均相催化剂。
Domino synthesis of functionalized pyridine carboxylates under gallium catalysis: Unravelling the reaction pathway and the role of the nitrogen source counter anion
作者:Dinesh Kumar、Himanshu Sharma、Nirjhar Saha、Asit K. Chakraborti
DOI:10.1002/asia.202200304
日期:2022.8
domino Michael-cyclodehydration-aromatization multicomponent reaction for the synthesis of functionalized pyridines from enaminones, 1,3-diketones, and NH4OAc undersolvent-freecondition is reported. The method is simple, high-yielding, and operates under mild conditions with a wide substrate scope. The use of different ammonium salts as a nitrogen source was investigated and the decisive role of the acetate
报道了在无溶剂条件下由烯胺酮、1,3-二酮和 NH 4 OAc 合成官能化吡啶的 GaI 3催化多米诺迈克尔环脱水芳构化多组分反应。该方法简单、收率高、操作条件温和、底物范围广。研究了使用不同的铵盐作为氮源,并确定了醋酸盐抗衡阴离子的决定性作用。
A highly efficient regioselective one-pot synthesis of 2,3,6-trisubstituted pyridines and 2,7,7-trisubstituted tetrahydroquinolin-5-ones using K5CoW12O40·3H2O as a heterogeneous recyclable catalyst
A systematic investigation into the regioselective one-pot, three-component condensation of enaminones la-g, beta-dicarbonyl compounds 2a-c, and ammonium acetate in the presence of a catalytic amount of K5CoW12O40 center dot 3H(2)O (0.01 equiv or 1.0 mol %) under solvent free conditions, as well as in refluxing isopropanol, has been reported. The reaction was highly efficient to produce 2,3,6-trisubstituted pyridines 3a-g, 4a-g, and novel 2,7,7-trisubstituted-5,6,7,8-tetrahydroquinoline-5-ones 5a-g in excellent yields. The present procedure offers advantages of short reaction time, simple work-up, and the catalyst exhibited remarkable reusable activity. (c) 2007 Elsevier Ltd. All rights reserved.
A facile synthesis of 2,3-disubstituted-6-arylpyridines from enaminones using montmorillonite K10 as solid acid support
A facile synthesis of 2.3-disubstituted-6-arylpyridines from enaminones using montmorillonite K10 as solid acid support is reported herein. (C) 2004 Published bv Elsevier Ltd.
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