Microwave Assisted Synthesis of Some Pyridine Derivatives Containing Mercaptotriazole and Thiazolidinone as a New Class of Antimicrobial Agents
摘要:
A fast and facile procedure for the synthesis of pyridomereaptotriazole 4a-e and pyridothiazolidinone 5a-e is being reported starting from diliydropyridine 1a-e. Subsequent oxidation with nitrating mixture (HNO3/H2SO4) produced the anticipated 2,6-dimethylpyridine derivatives 2a-e, which were subsequently condensed with thiosemicarbazide in ethanol to produce the key intermediate 2,2'-[4(4-substituted phenyl)- 2,6-dimethylpyridine-3,5-diyl]dicarbonyldihydrazine carbothioamides 3a-e. In the final step pyridomercaptotriazole derivatives 4a-e were synthesized by treating 3a-e in alkaline media. In parallel pyridothiazolidinone derivatives 5a-e were obtained by the reaction of 3a-e with ClCH2COOH/CH3COONa. All the reactions were carried out on microwave irradiation in good yield with short time. The structures of all the compounds have been confirmed on the basis of their analytical, IR, H-1 NMR, and Mass spectral data (Tables I and II). The potent antimicrobial effects of the synthesized compounds were also investigated.
Multicomponent Domino Cyclization-Oxidative
Aromatization on a Bifunctional Pd/C/K-10
Catalyst: An Environmentally Benign Approach toward the
Synthesis of Pyridines
作者:Béla Török、Omar De Paolis、Jonathan Baffoe、Shainaz Landge
DOI:10.1055/s-0028-1083177
日期:——
A one-pot synthesis of substituted pyridines via a domino cyclization-oxidative aromatization (dehydrogenation) approach is described. The process is based on the use of a new bifunctional noble metal-solid acid catalyst, Pd/C/K-10 montmorillonite and microwave irradiation. The cyclization readily takes place on the strong solid acid while palladium dehydrogenates the dihydropyridine intermediates to the desired products.
An Efficient Transition-Metal-Chloride/Sodium-Nitrite/TEMPO Catalytic System for Aerobic Oxidative Aromatisation of Hantzsch 1,4-Dihydropyridines
作者:Bin-Hui Lou、Shu-Bin Chen、Jian Wang、Ying Chen、Jing-Hua Li
DOI:10.3184/174751913x13701832537930
日期:2013.7
A facile and efficient transition-metal-chloride/sodium-nitrite/TEMPO catalytic system for aerobic oxidative aromati-sation of Hantzsch 1,4-dihydropyridines in high yields under mild conditions is described.
New Strategy for the Oxidation of Hantzsch 1,4‐Dihydropyridines and Dihydropyrido[2,3‐d]pyrimidines Catalyzed by DMSO under Aerobic Conditions
作者:Anil Saini、Sanjay Kumar、Jagir S. Sandhu
DOI:10.1080/00397910701410442
日期:2007.7
novel metal‐salt‐oxidant‐free, efficient, and economical method for the oxidation of Hantzsch 1,4‐dihydropyridines that uses aerial oxygen and solvent‐grade dimethylsulfoxide is described. Also, the synthesis of pyrido[2,3‐d]pyrimidines is achieved from in situ oxidation of dihydropyrido[2,3‐d]pyrimidines that arise from the reaction of 6‐aminouracils and cyano olefins in dimethylsulfoxide.
Superparamagnetic core‐shell metal–organic framework Fe
<sub>3</sub>
O
<sub>4</sub>
@Ni‐MOF as efficient catalyst for oxidation of 1,4‐dihydropyridines using hydrogen peroxide
Fe3O4@Ni-MOF revealed high efficiency for oxidation of various 1,4-dihydropyridines using hydrogenperoxide. The Box–Behnken design matrix and the response surface method were applied to investigate the optimization of the reaction conditions. The conditions for optimal reaction yield and time were: amount of catalyst ≈17 mmol, temperature ≈78°C and amount of hydrogenperoxide ≈ 1 ml. A variety of 3,5-diacyl
描述了一种在超顺磁性核-壳金属-有机骨架 Fe 3 O 4 @Ni存在下使用 H 2 O 2氧化某些 3,5-二酰基或 3,5-二酯 1,4-二氢吡啶的简便有效的方法-MOF。Fe 3 O 4 @Ni-MOF 是通过 Step-by-Step 方法获得的,其中磁性 Fe 3 O 4使用巯基乙酸连接剂用 Ni-MOF 涂覆磁性纳米颗粒。使用热重分析、FT-IR 光谱、粉末 X 射线衍射、场发射扫描电子显微镜和能量色散 X 射线分析对合成的催化剂进行了表征。新型超顺磁性核壳金属有机骨架 Fe 3 O 4@Ni-MOF 显示使用过氧化氢氧化各种 1,4-二氢吡啶的效率很高。应用 Box-Behnken 设计矩阵和响应面法来研究反应条件的优化。最佳反应收率和时间的条件是:催化剂量≈17 mmol,温度≈78°C,过氧化氢量≈1 ml。使用 H 2 O 2和 Fe 3 O 4已将各种具有不同取代官能团的
Oxidative aromatization of Hantzsch 1,4-dihydropyridines by cupric bromide under mild heterogeneous condition
作者:Forid Saikh、Rimpa De、Somnath Ghosh
DOI:10.1016/j.tetlet.2014.09.025
日期:2014.11
A mild heterogeneous oxidizing agent, cupricbromide has been utilized for the oxidative aromatization of Hantzsch 1,4-dihydropyridines to the corresponding pyridine derivatives in excellent yields with the isolation of products by simple work-up procedure.