Coumarinyl pyrazole derivatives of INH: promising antimycobacterial agents
摘要:
The purpose of this study was to evaluate the antimycobacterial activity of various pyrazole derivatives derived from the isoniazid pharmacophore along with coumarin scaffold. The synthesized title compounds (4a-4k) were investigated for their in vitro antimycobacterial activity against Mycobacterium tuberculosis H(37)Rv using Resazurin MIC assay. The synthesized compounds exhibited MIC ranging from 0.625 to 2.50 mu g/ml. Among the series tested, compound 3-[3-(4-fluorophenyl)-1-isonicotinoyl-1H-pyrazol-5-yl]-2H-chromen-2-one 4i was found to be the most active with MIC of 0.625 mu g/ml.
A facile and diverse synthesis of coumarin substituted spirooxindole and dispiro oxindole-pyrrolizidine/pyrrolothiazole/pyrrolidine derivatives via 1, 3-dipolar cycloaddition
A diverse series of coumarin substituted spirooxindole and dispirooxindole-pyrrolizidine/pyrrolothiazole/pyrrolidinederivatives have been obtained via azomethineylide specific three-component 1,3-dipolarcycloadditionreaction. This protocol features include operational simplicity, mild reaction conditions, high yields and a broad substrate scope.
Synthesis and Antibacterial Activity of a New Series of 3&hyphen;&lsqb;3&hyphen;&lpar;Substituted Phenyl&rpar;&hyphen;1&hyphen;Isonicotinoyl&hyphen;1<i>H</i>&hyphen;Pyrazol&hyphen;5&hyphen;yl&rsqb;&hyphen;2<i>H</i>&hyphen;Chromen&hyphen;2&hyphen;one Derivatives
A novel series of 3‐[3‐(substituted phenyl)‐1‐isonicotinoyl‐1H‐pyrazol‐5‐yl]‐2H‐chromen‐2‐one derivatives 4a–k have been synthesized by the reaction of 3‐[2,3‐dibromo‐3‐(substituted phenyl) propanoyl]‐2H‐chromen‐2‐one 3a–k and isonicotinic acid hydrazide in the presence of triethylamine in absolute ethanol, characterized by spectral data and screened for their in‐vitro antibacterialactivity against
An efficient and chemoselective synthesis of biologically valuable chromeno[3,4-c]pyrrole 2-oxides containing one chiral stereocenter is described. In this method, by using a sequential nucleophilic addition reaction involving coumarins (α,β-unsaturated coumarins or 3-acetylcoumarins), activated acetylenic compounds, triphenylphosphine as a catalyst, and hydroxylammonium chloride (HAC) as an NO source
描述了一种含有一个手性立体中心的、具有生物价值的色并[3,4- c ]吡咯2-氧化物的有效化学选择性合成方法。该方法以香豆素(α,β-不饱和香豆素或3-乙酰香豆素)、活化炔属化合物、三苯基膦为催化剂、氯化羟铵(HAC)为NO源,通过连续亲核加成反应,合成取代色烯[3]。 ,4- c]吡咯2-氧化物的制备具有优异的效率。易得的起始原料、不含金属催化剂、绿色温和的条件、化学选择性、易于纯化(产物可以通过简单的过滤和乙醇洗涤来纯化)以及合成上有用的产率是这一前所未有的转变的一些突出优点。