研究生: |
薛智允 Hsueh, Chih-Yun |
---|---|
論文名稱: |
(一) 中心掌性轉換成軸掌性策略:不對稱合成 3-苯並呋喃基吲哚阻轉異構物
(二) 羥基芳基磺醯基吲哚生成插烯亞胺中間體與丙二腈經不對稱麥可加成/環加成/互變異構化反應合成2-胺基-4-氫-𠳭唏衍生物 I Asymmetric Synthesis of 3-Benzofuran-2-yl-indoles Atropisomers through Conversion from Central to Axial Chirality II Asymmetric Synthesis of 2-Amino-4H-chromenes via Michael Addition/Cyclization/Tautomerization Reaction of Malononitrile and Vinylogous Imine Intermediates Generated from Hydroxy Arylsulfonyl Indoles |
指導教授: |
林文偉
Lin, Wenwei |
口試委員: |
張永俊
Jang, Yeong-Jiunn 劉維民 Liu, Wei-Min 姚清發 Yao, Ching-Fa 林文偉 Lin, Wenwei |
口試日期: | 2023/06/29 |
學位類別: |
碩士 Master |
系所名稱: |
化學系 Department of Chemistry |
論文出版年: | 2023 |
畢業學年度: | 111 |
語文別: | 中文 |
論文頁數: | 124 |
中文關鍵詞: | 羥基芳基磺醯基吲哚 、α-溴苯乙酮 、插烯亞胺中間體 、3-(2,3-二氫呋喃基)吲哚 、(4+1) 合環反應 、丙二腈 、2-胺基-4-氫-𠳭唏衍生物 、有機催化 |
英文關鍵詞: | hydroxy arylsulfonyl indole, vinylogus imine, 3-(benzodihydrofuran-2-yl) indole, (4+1) cycloaddition, malononitrile, 2-amino-4H-chromene derivatives, Michael addition, organocatalyst |
研究方法: | 實驗設計法 、 準實驗設計法 、 主題分析 |
DOI URL: | http://doi.org/10.6345/NTNU202300817 |
論文種類: | 學術論文 |
相關次數: | 點閱:76 下載:0 |
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第一部分:
利用羥基芳基磺醯基吲哚及 α-溴苯乙酮在鹼性條件下會形成插烯亞胺中間體,隨後再進行麥可加成反應、 (4+1) 合環反應得到 3-(2,3-二氫呋喃基)-吲哚,再經由氧化合成出 3-(苯並呋喃基)-吲哚。對於氧化成 3-(苯並呋喃基)-吲哚已做了一些實驗,不過目前尚無法合成出 3-(苯並呋喃基)-吲哚。
由於 α-溴苯乙酮作為起始物會產生少許副產物,使得產率不佳。因此將其更換成同是作為一個碳源的合成子起始物,N-苯甲醯甲基吡啶鹽類,解決了使用 α-溴苯乙酮而發生副反應的問題。此外也透過控制實驗的比較,提出了可能的反應機構。
此部分仍用一樣的起始物羥基芳基磺醯基吲哚,僅更換不同的親核試劑,丙二腈。在鹼性條件下,羥基芳基磺醯基吲哚會先形成插烯亞胺中間體再與丙二腈進行麥可加成/環加成/互變異構化不對稱反應合成 2-胺基-4氫-𠳭唏衍生物。
因為起始物羥基芳基磺醯基吲哚反應性較差,我們相信將吲哚進行甲基保護,可使反應性大幅改善。目前反應條件優化到產率高達 67% 及鏡像超越性高達 74%。
除此之外,也將羥基芳基磺醯基吲哚更換成胺基芳基磺醯基吲哚,期望其產物可以透過後續氧化得到軸掌性化合物。
也為了拓展此種合成策略的應用,我們更換以芳基磺醯基保護不同骨架的起始物。像是 4-羥基芳基磺醯基香豆素及 2-羥基芳基磺醯基萘醌,都有對其進行一些初期研究。
Under basic conditions, the hydroxy arylsulfonyl indoles first form vinylogous imine intermediates and then undergo Michael addition and (4+1) cycloaddition reaction to provide 3-(benzofuran-2-yl)-indoles. However, the use of α-bromoacetophenones resulted in poor yields due to the formation of byproducts. Therefore, N-benzoylmethylpyridinium salts are used as starting materials instead to avoid the side reactions. Additionally, we investigate the reaction mechanism of hydroxy arylsulfonyl indoles and α-bromoacetophenone and identified a possible mechanism through control experiments.
This section also uses the same starting materials, hydroxy arylsulfonyl indoles, and only changes the different nucleophilic reagent, malononitrile. Under basic conditions, the hydroxy arylsulfonyl indoles first form an vinylogous imine intermediates. Then the vinylogous imine intermediates react with malononitrile via asymmetric Michael addition/cyclization/tautomerization to provide 2-amino-4H-chromene derivatives.
Because the reactivity of the starting materials, hydroxy aryl sulfonyl indoles, are poor, we believe that the protecting group of indoles can significantly improve its reactivity. Currently, the reaction conditions can be optimized to achieve a yield of products up to 67% with up to 74% ee.
In addition, hydroxy arylsulfonyl indoles are replaced with amino arylsulfonyl indoles so that its products are expected to be possibly oxidized to obtain axial chirality compounds.
To expand the application of this synthetic strategy, different frameworks of arylsulfonyl-protected starting materials are also proposed in our preliminary study, such as 4-hydroxy arylsulfonyl coumarins and 2-hydroxy arylsulfonyl naphthoquinones.
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