基于苯并咪唑結構單元的小分子化合物的合成及陰離子跨膜轉(zhuǎn)運活性
[Abstract]:The cell is the basic unit to maintain the normal life activity of the body. It is exchanged with the outside world by the channel protein embedded in the cell membrane. Once the channel protein on the cell membrane is abnormal in structure or function, it will lead to a series of diseases, collectively known as "ion channel disease." Therefore, if a class of compounds can be found to replace dysfunctional channel proteins and recover their ion transmembrane transport function, they can be developed as therapeutic drugs. The reported anionic transporters are mainly divided into two categories: natural products with anion transmembrane transport and synthetic small molecular anion transporters. In recent years, a variety of organic small molecules with strong anionic transmembrane transport activity have been synthesized by using cholic acid, formamide, polyamide, calixarene and (thiourea). Because of its small molecular weight, easy synthesis, good biocompatibility and the ability to combine with anions through hydrogen bonds, benzimidazole has become a concerned structural module for the construction of artificial small molecular anionic transporters. However, the ion transmembrane transport activity of benzimidazole compounds reported at present is relatively low. In order to improve the ion transmembrane transport activity of benzimidazole compounds, two kinds of compounds were designed and synthesized. The first series of compounds are 1: 3- bis (2-benzimidazolyl) benzene 1 and its methylates 2, para-isomer 3, o-isomer 4 and monobenzimidazole derivative 5. Compounds 1 and 3-5 were obtained by condensation of o-phenylenediamine with substituted phthalic acid and benzoic acid respectively, while compound 2 was obtained by methylation of compound 1. On the basis of compound 1, the second series of compounds were obtained by introducing different electrical substituents such as methyl and nitro groups. This kind of compound is obtained by condensation of 4 different groups of o-phenylenediamine with isophthalic acid or isophthalic acid. The structure of compound 1-11 was characterized by ESI-MS,HR-ESI-MS,1H NMR and 13C NMR. The anion transmembrane transport activity of compound 1-11 was studied by fluorescence spectrophotometry using lecithin (EYPC) liposome as a model. The results showed that both compound 1 and compound 6-11 had good anion transmembrane transport activity, and the mechanism of transport was reverse transport of Cl-/NO3- with a small amount of Cl-/H in the same direction. However, compound 2-5 had little anion transmembrane transport activity. In addition, compounds 1 and 6-11 both play a transmembrane transport role in the form of carriers. For the second series of compounds, the ion transport activity of 6-10 was significantly higher than that of methyl substituted compounds. In particular, the activity of nitro-substituted compound 10 is 789 times that of compound 1. The preliminary study of structure-activity relationship shows that N-H structure of benzimidazole unit is the core structure of compound 1 for ion transmembrane transport, and only when two benzimidazole units are located in the intermediate position of the benzene ring, the best anion transmembrane transport activity can be obtained. The introduction of electron-absorbing groups into benzimidazole unit can significantly improve the ion transmembrane transport activity of the compounds. These preliminary structure-activity relationships are expected to provide a reference for the rational design of the efficient anion transporters based on 1 ~ 3- bis (2-benzimidazolyl) benzene in the future.
【學位授予單位】:南方醫(yī)科大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:R914
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