Regioselectivity and Tautomerism of Novel Five-Membered Ring Nitrogen Heterocycles Formed via Cyclocondensation of Acylthiosemicarbazides
作者:Jana Tomaščiková、Ján Imrich、Ivan Danihel、Stanislav Böhm、Pavol Kristian、Jana Pisarčíková、Marián Sabol、Karel Klika
DOI:10.3390/molecules13030501
日期:——
A series of 1-acyl-4-phenyl/(acridin-9-yl)thiosemicarbazides 3, including fournew compounds, were prepared in order to study substituent effects on cyclizationreactions with oxalyl chloride (producing imidazolidine-4,5-diones 4), dimethylacetylenedicarboxylate (to give thiazolidin-4-ones 7 and 8) and autocondensation underalkaline conditions (to yield 1,2,4-triazoles 9). A positional isomer, 10 of compound 3f wasalso prepared. Altogether, twenty new compounds characterized and identified by IR, UV,1H, 13C and 2D NMR and quantum chemical calculations are described. The tautomerismof the products and regioselectivity of the reactions were evaluated. Compounds 3f−h,3h·2HCl, 7b,d and 10 were screened for cytotoxic activity against the L1210 leukemia cellline and all compounds, except for 3f, exhibited promising inhibitions of cell growth.
制备了一系列 1-酰基-4-苯基/(吖啶-9-基)硫代氨基脲 3,包括四种新化合物,以研究取代基对与草酰氯(生成咪唑烷-4,5-二酮 4)、二甲基乙酰二甲酸酯(生成噻唑烷-4-酮 7 和 8)和碱性条件下自缩合(生成 1,2,4-三唑 9)的环化反应的影响。此外,还制备出了化合物 3f 的位置异构体 10。通过红外光谱、紫外光谱、1H、13C 和 2D NMR 以及量子化学计算,共描述和鉴定了 20 种新化合物。对产物的同分异构和反应的区域选择性进行了评估。化合物 3f-h、3h-2HCl、7b、d 和 10 对 L1210 白血病细胞进行了细胞毒活性筛选,除 3f 外,所有化合物都表现出良好的细胞生长抑制作用。