| 研究生: |
陳威廷 Chen, Wei-Ting |
|---|---|
| 論文名稱: |
生物藥理行為與化學取代基效應之理論研究 Theoretical Studies of Some Biomedical Behaviors and Chemical Substitution Effects |
| 指導教授: |
王小萍
Wang, Shao-Pin 陳淑慧 Chen, Shu-Hui |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2013 |
| 畢業學年度: | 101 |
| 語文別: | 英文 |
| 論文頁數: | 107 |
| 中文關鍵詞: | 源始計算 、抗白內障 、吡諾克辛 、薑黃素 、去甲基化薑黃素 、軌域作用 、狄耳士-阿德爾反應 、放光材料 、三(8-羥基喹啉)鋁 、雙硫鍵 |
| 外文關鍵詞: | ab initio calculation, anti-cataractogenesis, pirenoxine, curcumin, demethylated-curcumin, orbital interaction, Diels-Alder reaction, luminescent material, Alq3, disulfide bond |
| 相關次數: | 點閱:112 下載:1 |
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Pirenoxine (PRX) 在抓取引發白內障的亞硒酸 (selenite) 陰離子,其生物藥理效應主要被描述為Na+ 誘導出兩陰離子間的 π-π 作用力。兩陰離子間的氫鍵作用也促使其加成物的形成。此外氫鍵也穩定了亞硒酸與curcumin (CCM) 所形成的加成物。由IR光譜其 νOH 波帶吸收強度的增強,可以證明氫鍵作用的存在。1H- 與77Se-NMR光譜則可利用CCM與亞硒酸陰離子間的酸鹼作用平衡來解釋。經由IR與NMR實驗,可證實demethylated-curcumin (DCCM) 抓取亞硒酸的能力。而這種CCM衍生物其抓取的能力,氫鍵作用扮演了主導的地位。在加成物中,CCM或其衍生物的質子轉移到亞硒酸上,其現象也可以被用來解釋IR光譜。利用量子力學研究所獲得CCM與DCCM結合位置的相關資訊,可以用來解釋實驗所觀察到的結合能力。
將取代基高能量的 π* 軌域引入乙烯系統之中,其下拉乙烯的LUMO能量之效應,使乙烯衍生物在動力學上有利於Diels-Alder (DA) 反應。而這結論解釋了文獻所觀察到的現象:由於路易士酸的協助,丙烯醛 (acrolein) 能夠以更低的能量障礙去進行DA反應。羥基或甲氧基將會推高 π-類型的邊界軌域,這個從研究中所得到結論,在天然鍵性軌域(NBO)方法中再次被應證。所以將OMe引入到乙烯之中,導致電子轉移的逆轉 (從diene到dienophile),如同芳基 (aryl)-芳基DA環化加成中觀察到OMe增強了 π-stacking,這些現象因此而可以被理解。二硫代苯 (dithiobis-benzene;DIBH) 的衍生物作為抗HIV配體,是因為其主要由 σ*SS 鍵結軌域所構成的LUMO (一個擁有約-1.5 eV非常低能量的反鍵結軌域),在苯基片段其LUMO的混入下,更加地壓低LUMO的軌域能量。由OH所修飾的DIBH,是一個比甲基所修飾的DIBH還要更好的配體,其出乎意料的結果,可以由S原子與OH之間接近10 kcal/mol電子不定域化穩定能量的強力氫鍵加以解釋。一個雙硫片段低能量的 σ*SS,再加上每個硫上高電子不定域性的孤對電子,是對於“氧化還原敏感性”的雙硫鍵 (disulfide bond) 之成因一種很有可能的解釋。
The biomedical effect of pirenoxine (PRX) shown by binding the cataractogenic selenite anion is mainly ascribed to Na+-induced π-π interaction between the two anions. The H-bonding between the two anions also contributes to the formation of adduct of the two anions. H-bonding is also responsible for stabilizing the adduct of selenite and curcumin (CCM). The H-bonding can be evidenced by the enhancement of the IR intensity of νOH band. The 1H- and 77Se-NMR spectra can be explained by the equilibrium of acid-base interaction between the curcumin and the selenite anion. Through IR and NMR experiments, the selenite-binding capability of the demethylated-curcumin (DCCM) can be confirmed. The H-bonding plays the dominating role in accounting for the binding capability of this curcumin derivative. Proton transfer from the CCM or its derivative to selenite in the adduct can be used to explain the IR spectra. The favoring binding site(s) for both CCM and DCCM obtained by quantum mechanic studies can explain the relative binding capabilities observed experimentally.
The pressing-down effect, exerted by the substituents' high-lying π* orbital(s) introduced to ethylene, on the ethylene's LUMO-level enables ethylene-derivatives kinetically favored for polar Diels-Alder (DA) reactions. This conclusion explains the observations: assisted by Lewis-acids, acroleins can proceed DA reactions with even lower lower energy barriers. Hydroxyl or methoxyl group would push-up π-type frontier orbitals, a conclusion derived from studies augmented with natural bond orbital (NBO) method. Introducing OMe to ethylene leading to inverse charge transfer (from diene to the dienophile), as well as the observation that OMe enhances the π-stacking observed for aryl-aryl DA cycloadditions, can thus be understood. The derivatives of dithiobisbenzene (DIBH) employed as anti-HIV ligands because their LUMOs, composed mainly of σ*SS BO (a sigma anti-bonding with very low energy in the neighborhood of -1.5 eV), are further lowered by the phenyl's fragmental LUMOs. The OH-modified DIBH, found unexpectedly a better ligand than the methyl-modified DIBH, is explained by the strong H-bonding formed between S-atom and OH as indicated by the near 10 kcal/mol of delocalization energy. The low-lying σ*SS of the di-sulfur framework, in combination of the high electron-delocalization lone-pair on each sulfur, is a promising explanation for the “redox-sensitivity” associated with a disulfide bond.
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