The third generation of isoxazole polycyclic aromatic hydrocarbons, acting as DNA-intercalator agents and possessing the binding constants in the range 104–105 M−1, in order to easily diffuse targeting remotely implanted tumors, has been synthesized in good yields according to the 1,3-dipolar cycloaddition methodology. The structure of the obtained cycloadducts has been determined by NOE experiments
为了易于扩散靶向远距离植入的肿瘤,已合成了第三代异恶唑多环芳烃,它们起着DNA嵌入剂的作用,其结合常数在10 4 –10 5 M -1范围内, 1,3-偶极环加成方法。所获得的环加合物的结构已通过NOE实验确定,并得到了PM3水平的计算研究的支持。已测试所有获得的化合物的体外细胞毒性活性,其中最强的化合物为(3 RS,5 SR)-2-苄基-N,N-二甲基-3-(吡喃-1-基)异恶唑烷-5 -羧酰胺(7天)显示对人肺癌(A-549)细胞的IC 50为4μM。此外,化合物7D显示出对与小牛胸腺DNA,聚d(AT)的插层结合常数2和聚d(GC)2 1.7×10 5 中号-1,1.6×10 5 中号-1和0.3×10分别为5 M -1。生物学和对接研究表明,在体外,这些化合物通过插入碱基对之间而复杂,从其小沟中接近DNA,优先选择AT核碱基对。