Quinonoid compounds via reactions of lawsone and 2-aminonaphthoquinone with α-bromonitroalkenes and nitroallylic acetates: Structural diversity by C-ring modification and cytotoxic evaluation against cancer cells
作者:Thekke V. Baiju、Renata G. Almeida、Sudheesh T. Sivanandan、Carlos A. de Simone、Lucas M. Brito、Bruno C. Cavalcanti、Claudia Pessoa、Irishi N.N. Namboothiri、Eufrânio N. da Silva Júnior
DOI:10.1016/j.ejmech.2018.03.079
日期:2018.5
Morita-Baylis-Hillmanacetates and α-bromonitroalkenes have been employed in cascade reactions with lawsone and 2-aminonaphthoquinone for the one-pot synthesis of heterocycle fused quinonoid compounds. The reactions reported here utilized the 1,3-binucleophilic potential of hydroxy- and aminonaphthoquinones and the 1,2/1,3-bielectrophilic potential of bromonitroalkenes and Morita-Baylis-Hillman acetates
Strategies towards potent trypanocidal drugs: Application of Rh-catalyzed [2 + 2 + 2] cycloadditions, sulfonyl phthalide annulation and nitroalkene reactions for the synthesis of substituted quinones and their evaluation against Trypanosoma cruzi
作者:James M. Wood、Nishikant S. Satam、Renata G. Almeida、Vinicius S. Cristani、Dênis P. de Lima、Luiza Dantas-Pereira、Kelly Salomão、Rubem F.S. Menna-Barreto、Irishi N.N. Namboothiri、John F. Bower、Eufrânio N. da Silva Júnior
DOI:10.1016/j.bmc.2020.115565
日期:2020.8
Rhodium-catalyzed [2 + 2 + 2] cycloadditions, sulfonyl phthalideannulations and nitroalkene reactions have been employed for the synthesis of 56 quinone-based compounds. These were evaluated against Trypanosoma cruzi, the parasite that causes Chagas disease. The reactions described here are part of a program that aims to utilize modern, versatile and efficient synthetic methods for the one or two
acid/base-free domino process is developed for the regioselective synthesis of 1,2,4-trisubstituted pyrroles. The process involves 1,3-dipolar cycloaddition of unsymmetrical azomethine ylide resulting from the thermal C–C bond cleavage of unactivated aziridines with β-bromo-β-nitrostyrene, followed by a cascade of elimination and aromatization reaction sequence to preferentially furnish 1,2,4-trisubstituted
Efficient Synthesis of 3-Phenylnaphtho[2,3-b]furan-4,9-diones in Water and Their Fluorimetric Study in Solutions
作者:Renzun Zhang、Dongcheng Xu、Jianwu Xie
DOI:10.1002/cjoc.201200499
日期:2012.8
A simple and efficient protocol has been developed for the synthesis of 3‐phenylnaphtho[2,3‐b]furan‐4,9‐diones by domino reaction of α‐bromonitroalkenes to 2‐hydroxynaphthalene‐1,4‐dione. With the optimal reaction conditions [NaOAc (120 mol%), water, 70°C, 7 h], the scope of the domino reaction was explored and the green approach provided the desired products in moderate to good yields at elevated
通过α-溴硝基烯烃与2-羟基萘-1,4-二酮的多米诺反应,已开发出一种简单有效的方法来合成3-苯基萘[2,3- b ]呋喃-4,9-二酮。在最佳反应条件下[NaOAc(120 mol%),水,70°C,7 h],探索了多米诺骨牌反应的范围,绿色方法提供了所需的产物,在升高的温度和温度下,在中等温度到良好的收率下,介导的条件。还提供了对该反应的机械合理化。通过紫外可见光谱和荧光光谱检查了化合物的吸收特性。所有化合物在溶液中均发出荧光,发出蓝光(432–433 nm),绿光(512–536 nm)或黄光(591 nm)。