DNA Binding Compounds. VII. Synthesis, Characterization and DNA Binding Capacity of 1,2-Dicarba-closo-dodecaborane Bibenzimidazoles Related to the DNA Minor Groove Binder Hoechst 33258
摘要:
以已知的 DNA 小沟粘合剂 Hoechst 33258 为基础,制备了一系列联苯并咪唑衍生物。
粘合剂 Hoechst 33258 的基础上制备了一系列联苯并咪唑衍生物,其中包括一个
1,2-dicarba-closo-dodecaborane 笼,可用于
硼中子俘获疗法(BNCT)。选择硼烷衍生物 (5){(7)
的选择是为了减少之前制备的硼烷衍生物(5){(7)对小沟 DNA 结合的立体抑制作用。
的立体抑制作用。这些双硼烷衍生物的合成和
DNA 结合的初步研究。
在此介绍。
Tumour-targetted boranes. Part 2. Coupling of closo-carboranes to substituted 2-nitroimidazoles via 1,3-dipolar cycloaddition
摘要:
Carboranes targetted to specific tumour tissues are important for boron neutron capture therapy of cancer. Direct syntheses of carboranes linked to 2-nitroimidazole were unsuccessful. A mild procedure for 1,3-dipolar cycloaddition of 4-(carboranylmethoxy)benzonitrile N-oxide 32 with a nitroimidazolyl-alkene 27 and with nitroimidazolyl-alkynes 3 and 30 has been developed. using a series of model reactions, yielding a dihydroisoxazole 28 and the isoxazoles 29 and31. respectively. The nitrile oxide 32 is unusually stable. Dithioacetals are shown to be suitable protecting groups for aromatic aldehydes under the vigorous reductive and Lewis acidic-basic conditions,of carborane formation. 6-Methoxy-4H-[1]benzopyrano[4,3-c]isoxazole 16 been synthesised by intramolecular 1,3-dipolar cycloaddition. The structure of-the isoxazole derivative 29 has been confirmed by an X-ray crystal structure analysis.