Unexpected regiospecific formation and DNA binding of new 3-(acridin-9-yl)methyl-2-iminothiazolidin-4-ones
作者:JÁN IMRICH、DANICA SABOLOVÁ、MÁRIA VILKOVÁ、JÚLIA KUDLÁČOVÁ
DOI:10.1007/s12039-015-1023-7
日期:2016.2
3-(acridin-9-yl)methyl-2-substituted imino-1,3-thiazolidin-4-ones were regiospecifically synthesized from unstable (acridin-9-yl)methyl thioureas and methyl bromoacetate (MBA) or bromoacetyl bromide (BAB). Unexpected formation of only one thiazolidinone regioisomer with both reagents was due to a new mechanism involving a transient spiro 9,10-dihydroacridine intermediate. These results are in contrast with the reactions
由不稳定的(acridin-9-yl)甲基硫脲和溴乙酸甲酯(MBA)或溴乙酰溴(区域性)区域特异性合成新的3-(acridin-9-yl)甲基-2-取代的亚氨基-1,3-thiazolidin-4-one BAB)。两种试剂仅会意外形成一种噻唑烷酮区域异构体,这是由于涉及瞬时螺环9,10-二氢ac啶中间体的新机制所致。这些结果与丙烯醛-9-基硫脲与MBA / BAB的反应相反,后者提供了两种不同的噻唑烷酮区域异构体。紫外可见滴定,CD光谱和荧光猝灭表明,新产品插入了小牛胸腺(CT)DNA,并从CT DNA-EB复合物中置换了溴化乙锭(EB)。固有结合常数K b和斯特恩-沃尔默常数K S V 的范围分别为0.79×10 5 – 2.85×10 5 M -1和17950 – 3360 M -1。发现对电子给体的2-(4-甲氧基苯基亚氨基)噻唑烷酮具有最强的结合亲和力。从热变性研究获得了DNA嵌