Design and synthesis of novel natural clinoptilolite-MnFe2O4 nanocomposites and their catalytic application in the facile and efficient synthesis of chalcone derivatives through Claisen-Schmidt reaction
the aldol-type Claisen–Schmidt reaction for the synthesis of chalcones. A strong catalytic synergy was observed between nano-MnFe2O4 particles and natural clinoptilolite in the structure of these nanocomposites. The products with a broad range of substituents on the reactants were efficiently obtained under room-temperature conditions within relatively short reaction times with good to excellent yields
通过使用各种量的锰铁氧体(MnFe 2 O 4)纳米粒子修饰天然斜发沸石的表面,制备了一系列三种新型纳米复合材料。通过XRD,FT-IR,EDX,VSM和TEM分析,可以充分表征这些锰铁氧体改性的纳米复合材料(MFO-NC)。在斜发沸石(MFO–NC-3)中含有40 wt%锰铁氧体的这些新型纳米复合材料之一在醛醇型Claisen–Schmidt反应中显示了强大的催化行为,可合成查耳酮。在纳米MnFe 2 O 4之间观察到强烈的催化协同作用这些纳米复合材料的结构中存在颗粒和天然斜发沸石。在一种制备的MFO-NC纳米复合材料的存在下,在室温条件下,在较短的反应时间内即可有效地获得在反应物上具有广泛取代基的产物,并具有良好或优异的收率。这种纳米复合材料在查耳酮的合成中也显示出很强的稳定性和可重复使用性。
Synthesis and Antimicrobial Activity of Azolyl Pyrimidines
A new class of azolyl pyrimidines linked by diamino sulfone moiety was prepared and studied their antimicrobialactivity. Chloro‐substituted and nitro‐substituted thiazolyl pyrimidines (9c and 9e) showed excellent antibacterial activity against Bacillus subtilis, while imidazolyl pyrimidines (10c and 10e) exhibited promising antifungal activity against Aspergillus niger.
Transition-Metal-Free<i>N</i>-Arylation of Pyrazoles with Diaryliodonium Salts
作者:Zsombor Gonda、Zoltán Novák
DOI:10.1002/chem.201502995
日期:2015.11.16
developed for the N‐arylation of pyrazoles using diaryliodoniumsalts. The transformation does not require any transition‐metal catalyst and provides the desired N‐arylpyrazoles rapidly under mild reaction condition in the presence of aqueous ammonia solution as a mild base without the use of inert atmosphere. The chemoselectivity of unsymmetric diaryliodoniumsalts was also explored with large number
Synthesis of Benzazolyl Pyrimidines Under Ultrasonication and Their Antimicrobial Activity
作者:Narendra Babu Kayathi、Donthamsetty V. Sowmya、Padmaja Adivireddy、Padmavathi Venkatapuram
DOI:10.1002/jhet.3134
日期:2018.4
(1) The benzoxazolyl/benzothiazolyl/benzimidazolyl pyrimidines were prepared under ultrasonication in the presence of pyridine/dimethylaminopyridine and triethylamine. (2) Better yields were recorded in 4‐(N,N‐dimethylamino)pyridine and Et3N. (3) The presence of electron withdrawing chloro, bromo, and nitro substituents enhanced antimicrobial activity (13c, 13e, 14e: minimum inhibitory concentration = 6
A library of benzazolyl pyrimidinyl carbamothioates were prepared by the reaction of benzazolyl carbonothioates with pyrimidinyl-2-amine in the presence of an ionic liquid- 1-butyl-3-methylimidazolium hydroxide ([bmim]OH) under ultrasonication at a frequency of 35 kHz and tested for antimicrobial activity. Chloro- and nitro-substituted benzothiazolyl/benzimidazolyl pyrimidinyl carbamothioates displayed prominent antibacterial activity against Bacillus subtilis, while nitro-substituted benzothiazolyl/benzimidazolyl pyrimidinyl carbamothioates showed excellent antifungal activity against Aspergilus niger.