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ID:21903429
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时间:2018-10-25
《嘧啶苯磺酰脲衍生物对小麦纹枯病菌体外抑菌活性的qsar研究与分子设计》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、嘧啶苯磺酰脲衍生物对小麦纹枯病菌体外抑菌活性的QSAR研宄与分子设计DOI:10.7612/j.issn.l0002537.2017.02.009摘要目的:建立嘧啶苯磺酰脲衍生物(PSU)对小麦纹枯病菌杀菌活性(Tc)和电性距离矢量(Ev)的定量构效关系(QSAR)模型,探讨影响Tc的结构因素.方法:基于拓扑方法计算了15种嘧啶苯磺酰脲衍生物的电性距离矢量.通过最佳变量子集回归建立这些化合物的Tc与Ev的多个QSAR模型.结果:其中最佳三元数学模型的判定系数(R2)及逐一剔除法的交叉验证相关系数(R2cv)分别为0.851和0.738.经统计指标诊断,所建模型具有
2、良好的稳健性及预测能力.结论:根据进入此模型的E62,E59和E27可知,影响嘧啶苯磺酰脲衍生物对小麦纹枯病菌杀菌活性的主要因素是分子的二维结构特征一NH-,S,-OH,-CHg(g=0,1)和C等结构碎片.由结构修饰提出3种化合物的抑菌活性(T%)均超出96.5%,有待以后生物实验予以证实.关键词嘧啶苯磺酰脲衍生物;小麦纹枯病菌活性;电性距离矢量:定量构效关系;分子设计中图分类号S482.2+7;06051文献标识码A文章编号10002537(2017)02005605QSARStudyontheAntifungalActivityofPyrimidinPhen
3、ylSulfonylureaDerivativestoRhizoctoniaCerealisandTheirMolecularDesignFENGDi,ZHAOPei,ZHAOZhiqiang,RONGJinchuang,WUPing,LUJun,FENGChangjun*(SchoolofChemistryandChemicalEngineering,XuzhouInstituteofTechnology,Xuzhou221111,China)AbstractObjective:Tostudythequantitativestructureactivityrel
4、ationship(QSAR)betweentheantifungalactivity(Tc)andtheelectronegativitydistancevector(Ev)of15pyrimidinphenylsulfonylureaderivatives(PSU),andanalyzethedominantinfluencestructuralfactorsofantioxidantactivities.Method:Theelectronegativitydistancevector(Ev)ofPSUwerecalculatedbythetopologic
5、almethod.TheQSARmodelswereestablishedbyusingleapsandboundsregressionanalysisfortheantifungalactivity(Tc)ofabovecompoundsinvitroagainstRhizoctoniacerealisalongwiththeEv.Results:Thetraditionalcorrelationcoefficient(R2)andthecrossvalidationcorrelationcoefficient(R2cv)ofleaveoneout(LOO)ar
6、e0.851and0.738,respectively.TheQSARmodelhasbothfavorableestimationstabilityandgoodpredictioncapabilitybystatisticalindextests.Conclusion:FromE62,E59,E27inthemodel,itshowsthatthemainfactortoaffecttheantifungalactivityofpyrimidinphenylsulfonylureaderivativesisatwodimensionalstructuralch
7、aracteristicsofthemolecular一NH—,S,-OH,—CHg(g=0,1)andCstructurefragments.Accordingtotheresultsobtainedfromthestructuralmodifications,theinhibitionactivity(T%)ofthreemodifiedmoleculesisover96.5%,anditisexpectedtobeconfirmedbyusingbiologicexperiments.Keywordspyrimidinphenylsulfonylureade
8、rivat
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