| 研究生: |
趙子瑄 Chao, Tzu-Hsuan |
|---|---|
| 論文名稱: | |
| 指導教授: |
鄭沐政
Cheng, Mu-Jeng |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學系 Department of Chemistry |
| 論文出版年: | 2020 |
| 畢業學年度: | 108 |
| 語文別: | 中文 |
| 論文頁數: | 56 |
| 中文關鍵詞: | 石墨烯 、環氧化 、喹啉鹽類 、蒽醌 、反應位向選擇性 |
| 外文關鍵詞: | Graphenes, Epoixdation, Quinolinium salts, Anthranils, Regioselectivity |
| 相關次數: | 點閱:73 下載:0 |
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環氧化物的製備在工業上有重要的應用1,因環氧化物可作為許多不同有機物的中間產物或是起始物2,歸因於其具有活性的三元環中心,其可以進行開環反應。環氧化物中,產量最多且最為重要的為環氧乙烷,因可以拿來進行開環反應得到乙二醇3,乙二醇為常用的抗凍劑,在工業上的用途十分廣泛。目前環氧化物的合成主要有三種方式,分別為氧氣搭配銀催化劑、過氧酸4, 5、鹵醇等三種反應試劑去進行反應,然而這些製程上仍會面臨到一些問題:需要一定的溫度進行反應、較貴的催化劑、需要額外添加氧化劑6。因此在本篇論文中將探討使用電化學反應搭配析氧反應產生Metal-oxo結構來將烯類氧化變成環氧化物,所使用的催化劑為四氮錯合金屬之石墨烯(簡稱gMN4,M=Fe or Ir)7,因先前的研究已知gFeN4以及gIrN4可以透過析氧反應8產生具有反應性的oxo並進行C-H鍵活化反應9,在本研究將使用此兩種催化劑,利用VASP10-12進行模擬,計算此兩種催化劑的Metal-oxo在四種烯類上進行催化的活化能以及反應自由能,選用的烯類為乙烯、反-2-丁烯、苯乙烯、環己烯,各代表不同環境的烯類。
由計算結果得知,反-2-丁烯以及苯乙烯利用gIrN4進行催化可以得到其活化能在USHE =1 V的情況下低於0.75eV,表示對於此兩個烯類來說有良好的反應性。而乙烯及環己烯的活化能則位於1~0.75 eV之間,顯示其活化能較高,反應性較不理想。除了反應性之外,本篇論文也探討了選擇性,反-2-丁烯與其競爭反應hydroxylation13,1,2-hydride shift14以及deprotonation比較都可以得到較低的活化能,同樣在苯乙烯的狀況下,環氧化反應的活化能也低於其他的競爭反應,因此可以確定使用gFeN4及gIrN4催化反-2-丁烯及苯乙烯進行環氧化反應可以有良好的反應性及選擇性。
喹啉鹽類可以做為藥物化學上使用的前驅物15,目前合成喹啉鹽類的方式主要是透過N上的孤對電子攻擊進行親核性加成16,但此法只能獲得N-alkyl的產物,因此本篇論文將探討在喹啉鹽類的另外一個合成途徑,使用苯胺、醛類、炔類進行合成17, 18。其中的關鍵4+2環加成是否為逐步或是一步反應,並且分析其反應位向,將活化能區分為扭曲能及作用能。本研究利用gaussian0919進行計算,最後得知其反應路徑中的關鍵步驟為一步反應,其中沒有中間產物的存在,且反應位向由扭曲能決定,當進入過渡態時不會偏折到炔類接上苯環的那一邊時,扭曲能較低,因此反應位向會傾向於苯環取代基在對位的產物。總結來說,本反應為一步 4+2環加成,且產物的取代基位置受到炔類取代基苯環的影響,使得產物只有其中一種。
氮-氧鍵基團存在在許多不同的藥物上,因此合成此類的環狀化合物對於藥物化學的合成十分重要,在先前合成類似的化合物的路徑中,通常是進行4+3環加成,在先前的研究曾經利用三角環20的結構搭配蒽醌進行反應,完成此環加成反應,然而不具有特定的exo立體位向選擇性,而立體位向對於藥物的合成上十分重要,因往往只有特定的光學活性中心才可以具有預期藥物所有的功能。在本篇研究中,使用了蒽醌及炔基搭配金的催化劑進行具有立體位項選擇性的4+3環加成,其中造成產物只有exo為主的原因來自於金的催化劑在過渡態的立體位向,因其基團進行攻擊的方式不一樣,總共會有四個非光學異構物存在,其中只有本次得到產物的反應路徑具有明顯較低的活化能,證明金的催化劑在本反應的高度立體位向選擇性而扮演重要的角色。
Preparations of epoxide are important industrial processes since epoxides can be used as starting material or intermediates for many reactions. However, the oxidizing agents used in the processes lead to capital cost. In the chapter 1, we discuss the epoxidation reaction using water as oxygen source with carbon-based materials: metal-N4-functionalized graphene(noted as gMN4, Metal = Fe, Ir) as catalysts. We examine four kinds of alkenes: Ethene, Trans-2-butene, Styrene and Cyclohexene. The results show that the epoxidation of Trans-2-butene and styrene will have barriers lower than 0.75 eV, which shows good reactivity. For selectivity, we discuss hydroxylation, 1,2-hydride shift and deprotonation. The three reaction will have higher activation energy than any steps in epoxidation. Using gFeN4 and gIrN4 can catalyze the epoxidation of both alkenes.
Quinolinium salts are precursors for many drugs. The main synthesis method is nucleophilic attack through lone pair electrons of nitrogen which leads to N-alkyl product. In chapter two, we discuss a new synthesis method using aniline-aldehyde-alkyne and Lewis acid and compute the reaction using Gaussian09. The key step is 4+2 cyclization which is a concerted reaction.
Nitroxy group exists in many drugs. In previous synthesis route, 4+3 annulation using three-membered ring and anthranils lead to no enantioselectivity product. In the chapter three, we discuss a new route using Anthranils, alkyne group and gold catalyst with Jaguar software. The product is highly enantioselective(exo). The computational result shows that the exo product route has lowest activation energy among all the possible products.
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校內:2025-07-01公開