研究生: |
王建泓 Wang, Chien-Hong |
---|---|
論文名稱: |
透過(1)一價銅催化布Buchwald–Hartwig反應及
(2)親電子性芳香環取代反應合成苯併咪唑化合物 Synthesis of benzimidazoles via (1) Copper(I)-catalyzed Buchwald–Hartwig reaction and (2) Electrophilic aromatic substitution reaction |
指導教授: |
簡敦誠
Chien, Tun-Cheng |
學位類別: |
碩士 Master |
系所名稱: |
化學系 Department of Chemistry |
論文出版年: | 2015 |
畢業學年度: | 103 |
語文別: | 中文 |
論文頁數: | 41 |
中文關鍵詞: | 氰胺 、Buchwald–Hartwig胺化 、Tiemann重排 、羥基胍 、親電子性芳香取代反應 |
英文關鍵詞: | cyanamide, Buchwald–Hartwig amination, Tiemann rearrangement, N-hydroxyguanidine, electrophilic aromatic substitution |
論文種類: | 學術論文 |
相關次數: | 點閱:84 下載:0 |
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2-Aminobenzimidazole是重要含氮雜環結構,廣泛存在許多具有生物活性的分子中,本論文主旨為合成2-aminobenzimidazole的相關衍生物。
第一部份中,我們開發從o-bromobenzonitrile以簡單快速的方式合成2-(N-alkylamino)benzimidazoles,反應由o-bromobenzonitrile透過Tiemann重排反應形成o-bromophenylcyanamide,再與一級和二級烷基胺在一價碘化銅與1,10-phenanthroline催化下,進行Buchwald–Hartwig 碳-氮鍵生成反應,即可製備一系列的2-(N-alkylamino)benzimidazole衍生物。
第二部份中,我們開發從benzonitrile以簡易的方式合成1-alkyl-2-(tosylamino)benzimidazoles,反應由benzonitrile透過Tiemann重排反應生成phenylcyanamides,接著進行烷基化和羥胺的加成即可生成N-aryl-N-alkyl-N’-hydroxyguanidine,最後加入TsCl活化氮上羥基脫去並進行分子內親電子性芳香取代反應,可製備一系列1-alkyl-2-tosylaminobenzimidazole衍生物。
2-Aminobenzimidazole derivatives are important nitrogen-containing heterocycles which often were embedded in many biologically active molecules. This thesis focuses on the synthesis of 1-aminobenzimidazole derivatives from benzonitriles.
In the first part, a direct approach for the synthesis of 2-(N-alkylamino)benzimidazoles from o-bromobenzonitriles was developed. The reaction of o-bromophenylcyanamides, obtained from o-bromobenzonitriles via Tiemann rearrangement, with various primary and secondary alkylamines employing of copper(I) iodide and 1,10-phenanthroline in 1,4-dioxane via Buchwald–Hartwig amination reaction protocol afforded a series of 2-(N-alkylamino)benzimidazoles.
In the second part, a metal-free approach for the synthesis of 1-alklyl-2-(tosylamino)benzimidazoles from benzonitriles was developed. A series of N-aryl-N-alkyl-N’-hydroxyguanidins were obtained from N-alkylation followed by hydroxylamine addition of phenylcyanamides, synthesized from benzonitriles via Tiemann rearrangement. p-toluenesulfonyl chloride-promoted intramolecular electrophilic aromatic substitution reaction of N-aryl-N-alkyl-N’-hydroxyguanidins afforded a series of 1-alkyl-2-(tosylamino)benzimidazoles.
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