Visible-Light-Induced Intermolecular Dearomative Cyclization of 2-Bromo-1,3-dicarbonyl Compounds and Alkynes: Synthesis of Spiro[4.5]deca-1,6,9-trien-8-ones
conditions. A 5.0 mmol scale dearomatization reaction proceeded smoothly with 95% yield even when the catalyst loading was reduced to 0.1 mol %, suggesting that this method was suitable for large-scale synthesis.
SYNTHESIS OF HETEROCYCLES ON THE BASIS OF ARYLATION PRODUCTS OF UNSATURATED COMPOUNDS. 11.<sup>1</sup>5-R-BENZYL-2- IMINOSELENAZOLIDIN-4-ONES FROM ETHYL 3-ARYL-2-BROMOPROPANOATES
作者:Mykola D. Obushak、Vasyl S. Matiychuk、Volodymyr M. Tsyalkovsky、Roman M. Voloshchuk
DOI:10.1080/10426500490257096
日期:2004.1
3-aryl-2-bromopropanoates 2a–p were prepared by reaction of ethyl acrylate with arenediazonium bromides 1a–p in the presence of CuBr (Meerwein arylation). These compounds react with selenourea to form 5-R-benzyl-2-iminoselenazolidin-4-ones 4a–p. Compounds 4a–p hydrolyze into the corresponding selenazolidin-2,4-diones.
study, an efficient synthesis and the antimicrobialactivityevaluation of some 4-oxo-thiazolidin-2-ylidene derivatives are presented. The structures of the target substances were confirmed by using 1H and 13C nuclear magnetic resonance spectroscopy, mass spectrometry, infrared spectroscopy, and elemental analysis. The synthesized compounds were evaluated for antimicrobialactivity against five bacterial
在这项研究中,提出了一些 4-oxo-thiazolidin-2-ylidene 衍生物的有效合成和抗菌活性评估。目标物质的结构通过1 H 和13 C 核磁共振光谱、质谱、红外光谱和元素分析确定。评价合成的化合物对五种细菌菌株(大肠杆菌、肺炎克雷伯菌、鲍曼不动杆菌、铜绿假单胞菌和金黄色葡萄球菌)和两种真菌菌株(白色念珠菌和新型隐球菌)的抗菌活性)。结果表明,该系列化合物具有抗菌和抗真菌活性。
Synthesis of Heterocycles from Arylation Products of Unsaturated Compounds: XIII. 5-R1-Benzyl-2-(R2-2-pyridylimino)thiazolidin-4-ones
作者:V. S. Matiichuk、N. D. Obushak、V. M. Tsyalkovskii
DOI:10.1007/s11178-005-0292-x
日期:2005.7
Meerwein reactions of arenediazonium bromides with methyl and ethyl acrylates gave 3-aryl-2-bromopropionic acid esters which were subjected to cyclocondensation with N-(2-pyridyl)- and N-(6-methyl-2-pyridyl) thioureas to obtain 5-R1-benzyl-2-(R2-2-pyridylimino)thiazolidin-4-ones. The latter were shown to exist in solution as E isomers of the imino form.
A visible-light-induced radical cascade cyclization of ortho-diisocyanoarenes for the synthesis of diethyl benzo[a]phenazine-6,6(5H)-dicarboxylates has been developed. This process provides an efficient and convenient protocol for the construction of benzo[a]phenazine skeleton that widely present in biologically active molecules and pharmaceuticals. The reaction takes place under mild conditions and
已开发出用于合成苯并[ a ]吩嗪-6,6(5 H )-二羧酸二乙酯的邻二异氰芳烃的可见光诱导自由基级联环化。该过程为构建广泛存在于生物活性分子和药物中的苯并[ a ]吩嗪骨架提供了一种高效便捷的方案。该反应在温和的条件下进行,以中等至极好的收率获得产物。