Preparation, antibacterial evaluation and preliminary structure–activity relationship (SAR) study of benzothiazol- and benzoxazol-2-amine derivatives
摘要:
In this study, a novel benzothiazol- and benzooxazol-2-amine scaffold with antibacterial activity was designed and synthesized. Preliminary structure-activity relationship analysis displayed that compound 8t with a 5,6-difluorosubstituted benzothiazole was found to be a potent inhibitor of Gram-positive pathogens, and exhibited some potential against drug-resistant bacteria and without cytotoxicity in therapeutic concentrations. In addition, molecular docking studies indicated that Staphylococcus aureus methionyl-tRNA synthetase might be the possible target of these compounds. Taken together, the present study provides an effective entry to the synthesis of a good lead for subsequent optimization and a new small molecule candidate drug for antibacterial therapeutics. (C) 2012 Elsevier Ltd. All rights reserved.
Design and synthesis of 5-alkoxy-[1,2,4]triazolo[4,3-a]quinoline derivatives with anticonvulsant activity
作者:Li-Jun Guo、Cheng-Xi Wei、Jing-Hao Jia、Li-Ming Zhao、Zhe-Shan Quan
DOI:10.1016/j.ejmech.2008.07.010
日期:2009.3
5-alkoxy-[1,2,4]triazolo[4,3-a]quinoline derivatives were synthesized using 4-hydroxyquinolin-2(1H)-one as the starting material. Their anticonvulsantactivities were evaluated by the maximal electroshock test (MES) and their neurotoxicities were measured by the rotarod test. The results of these tests demonstrated that 5-hexyloxy-[1,2,4]triazolo[4,3-a]quinoline (3f) was the most potent anticonvulsant, with
以4-羟基喹啉-2(1 H)-one为起始原料,合成了一系列5-烷氧基-[1,2,4]三唑并[4,3- a ]喹啉衍生物。通过最大电击试验(MES)评估其抗惊厥活性,并通过旋转脚踏试验(Rotarod test)测量其神经毒性。这些测试的结果表明,5-己氧基-[1,2,4]三唑并[4,3- a ]喹啉(3f)是最有效的抗惊厥药,中位有效剂量(ED 50)为19.0 mg / kg,MES测试中的保护指数(PI = TD 50 / ED 50)值为5.8。化合物5-苄氧基-[1,2,4]三唑并[4,3- a ]喹啉(3j),在22.8 mg / kg的剂量下控制MES试验诱发的癫痫发作时,其活性比化合物3f弱,但神经毒性较低,PI值为12.0,比市售的卡马西平更安全。为了解释抗惊厥活性的可能机理,在戊烯四唑试验,异烟肼试验,硫代氨基脲试验,3-巯基丙酸试验和苯丙氨酸试验中测试了化合物3j。
Histamine H.sub.2 -antagonist oxazole and thiazole derivatives and
申请人:Smith Kline & French Laboratories Limited
公开号:US04681883A1
公开(公告)日:1987-07-21
This invention relates to aminoalkylphenoxyalkyl substituted heterocycles. These compounds antagonize the action of histamine on histamine H.sub.2 -receptors in the brain. A compound of the invention is 2-[3-[3-(piperidinomethyl)phenoxy]propylamino]benzthiazole.
Regioselective preparation and NMR spectroscopy study of 2-chloro-4-ethoxy-quinoline for the synthesis of 2-((3-aminopropyl)amino)quinolin-4(1<i>H</i>
)-one
作者:Pedro Henrique Vasconcelos Vontobel、Rodrigo dos Santos Fuscaldo、Francisco Paulo dos Santos、Jessie Sobieski da Costa
DOI:10.1002/mrc.4980
日期:2020.4
distinction between the C2 and C4 ethoxylation products was achieved using 1 H-15 N HMBC. Compound 3 is an intermediate used for the synthesis of 2-((3-aminopropyl)amino)quinolin-4(1H)-one (5), which displays peculiar behavior during 1 H NMR analysis, such as the broadening of the H8 singlet and unexpected deuteration at the C8-position. Effort has been dedicated to understand these findings.
Heterocyclic compounds which are inhibitors of histamine activity, in particular, inhibitors of H-2 histamine receptors. A specific compound of this invention is 2-[2-(4-methyl-5-imidazolylmethylthio)ethylamino]-4-pyrimidone.