A series of new N-hydroxyguanidines were synthesized and tested for electron acceptor activity on bovine milk xanthine oxidase using xanthine as reducing substrate. Manual inspection of the structure-activity data revealed that molecules containing nitro groups ("set A") show a different structure-activity relationship pattern compared to non-nitro compounds ("set B"). Accordingly separate QSAR models were built and validated for the two sets. Substantial differences were found in properties governing acceptor activity for the models, the only common property being sterical access to the imino nitrogen atom of the hydroxyguanidinimines. For set A molecules the presence of a nitro substituent at a certain distance range from the hydroxuguanidino group was most important. In addition, the presence of a nitro group in the ortho position interacting with NH(2) of the hydroxyguanidino group, and the mutual geometry of the phenyl ring, hydroxyguanidine, and imine groups was important for this set. By contrast, for set B molecules the acceptor activity was most influenced by the geometry of methoxy groups and the size and geometry of meta and para substituents of the phenyl ring.

译文

以黄嘌呤为还原底物,合成了一系列新的N-羟基胍,并测试了牛乳黄嘌呤氧化酶的电子受体活性。手动检查结构活性数据显示,与非硝基化合物 (“B组”) 相比,含有硝基的分子 (“A组”) 显示出不同的结构活性关系模式。因此,为这两组建立并验证了单独的QSAR模型。在控制模型受体活性的性质上发现了实质性差异,唯一的共同性质是对羟基胍亚胺的亚氨基氮原子的空间进入。对于set A分子,最重要的是与氢xuguanidino基团在一定距离范围内存在硝基取代基。此外,在与羟基胍基的NH(2) 相互作用的邻位中存在硝基基团,以及苯环,羟基胍和亚胺基团的相互几何形状对于该组很重要。相比之下,对于set B分子,受体活性受甲氧基的几何形状以及苯环的间位和对位取代基的大小和几何形状的影响最大。

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