Nano CuO–Ag‐catalyzed synthesis of some novel pyrano[2,3‐d] pyrimidine derivatives and evaluation of their bioactivity
作者:Sreelakshmi Poola、Mahammad S. Shaik、Murali Sudileti、Subbarao Yakkate、Vedasree Nalluri、Apparao Chippada、Suresh R. Cirandur
DOI:10.1002/jccs.201900256
日期:2020.5
coli, againstGram‐positivebacteria such as Bacillus subtilis and Staphylococcus aureus, and antifungal activityagainst Candida albicans and Candida glabrata was also evaluated. The compoundsshowed higher bacterial activity than the standard used. Compounds 5b, 5d, 5g, 5h, and 5i exhibited higher free radical scavenging activity than the standard butylated hydroxy toluene (BHT). Compounds 5b, 5d
开发了一种简单,高效且绿色的方法,在纳米CuO-Ag作为催化剂的情况下,通过Knoevenagel和Michael加成合成吡喃并[2,3-d]嘧啶衍生物。合成的目标化合物5a–l的结构已通过光谱和元素分析得到了确认,并通过2,2-二苯基-1-picrylhydrazyl(DPPH),H 2 O 2和NO方法筛选了其抗氧化活性。它们对革兰氏阴性菌铜绿假单胞菌和大肠杆菌,枯草芽孢杆菌和金黄色葡萄球菌等革兰氏阳性菌具有抗菌活性,对白色念珠菌具有抗真菌活性。并且还评价了光滑念珠菌。该化合物显示出比所用标准更高的细菌活性。化合物5b,5d,5g,5h和5i表现出比标准丁基化羟基甲苯(BHT)更高的自由基清除活性。与标准四环素相比,化合物5b,5d和5h对革兰氏阳性细菌具有更高的活性,化合物5b,5d,5h和5i对革兰氏阴性细菌具有更高的活性。化合物5b,5j,并且5l对球形假丝酵母和白色念珠菌的抗真菌活性比标准灰黄霉素更高。
An expeditious synthesis of novel pyranopyridine derivatives involving chromenes under controlled microwave irradiation
作者:Dushyant Singh Raghuvanshi、Krishna Nand Singh
DOI:10.3998/ark.5550190.0011.a25
日期:——
An efficient synthesis of novel pyrano[2,3-b]pyridine derivatives has been achieved by the cyclocondensation of 2-amino-3-cyano-4H-chromenes and cyclohexanone in the presence of aluminium chloride undercontrolledmicrowaveirradiation. The experimental conditions have been thoroughly optimized and established, allowing significant rate enhancements and excellent yields. The starting 4H-chromenes were
The preparation of pharmaceutically active 2-amino-4H-chromene derivatives has been achieved using a nano powder of natural clinoptilolite (CP) zeolite. A wide range of these worthy structures having diverse substituents on the 4H-chromene ring were efficiently synthesized via the reaction of an aromatic aldehyde and variety of enolizable C–H activated acidic compounds. Nano sized natural clinoptilolite
A facile and efficient synthesis of 2-amino-3-cyano-4H-chromenes and tetrahydrobenzo[b]pyrans using 2,2,2-trifluoroethanol as a metal-free and reusable medium
A highly efficient one-potthree-component regioselective synthesis of 2-amino-3-cyano-4H-chromene and tetrahydrobenzo[b]pyran derivatives has been developed by annulation of aldehydes, malononitrile, and resorcinol or dimedone under reflux conditions in 2,2,2-trifluoroethanol without the use of a catalyst or any other additive.
通过在回流条件下2醛,丙二腈和间苯二酚或二甲酮的环化反应,已经开发出了一种高效的一锅三组分区域选择性合成2-氨基-3-氰基-4 H-色烯和四氢苯并[ b ]吡喃衍生物的方法。 ,2,2-三氟乙醇,不使用催化剂或任何其他添加剂。
Nano polypropylenimine dendrimer (DAB-PPI-G<sub>1</sub>): as a novel nano basic-polymer catalyst for one-pot synthesis of 2-amino-2-chromene derivatives
作者:Behrooz Maleki、Safoora Sheikh
DOI:10.1039/c5ra04458h
日期:——
For the first time, a novel nano basic-polymer catalyst for the green synthesis of new 2-amino-2-chromene derivatives, avoiding the use of any metal or acid catalysts, is proposed.