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。
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。
Aqua mediated synthesis of substituted 2-amino-4H-chromenes and in vitro study as antibacterial agents
作者:Mazaahir Kidwai、Shilpi Saxena、M. Khalilur Rahman Khan、Sharanjit S. Thukral
DOI:10.1016/j.bmcl.2005.06.041
日期:2005.10
A simple, clean, environmentally benign route to the synthesis of 2-amino-chromenes is described using K2CO3 as a green catalyst in water under microwave irradiation. This implies a convenient route avoiding the usage of hazardous organic solvents and organic bases. This technique requires only water in both the reaction step and workup, thus rendering the whole procedure into a truly ecofriendly green protocol. All the synthesized compounds were shown to possess antibacterial activity as tested in vitro against standard strains of Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus. (c) 2005 Elsevier Ltd. All rights reserved.
Glycine catalyzed convenient synthesis of 2-amino-4H-chromenes in aqueous medium under sonic condition
作者:Bandita Datta、M.A. Pasha
DOI:10.1016/j.ultsonch.2012.01.006
日期:2012.7
A one-pot three-component condensation of an aldehyde, malononitrile, and resorcinol has been achieved by ultrasound method. The reaction has been catalyzed by glycine in aqueous medium. This protocol afforded corresponding 2-amino-4H-chromenes in shorter reaction times, high yields and simple work-up procedures with the green aspects by avoiding toxic reagents. (C) 2012 Elsevier BM. All rights reserved.