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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
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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.

    目錄 謝辭 i 摘要 ii Abstract iv 式列表 ix 圖列表 xi 表列表 xiii 縮寫對照表 xiv 一、序章 1 1-1 軸掌性 1 1-2 實驗室過去使用高活性亞烷基化合物 6 1-3 芳基磺醯基吲哚在反應上的應用 8 1-4 鄰醌甲基化物之介紹 12 二、第一部分 14 2-1 前言 14 2-1-1 2-苯基吲哚生物活性 14 2-1-2 苯並呋喃生物活性 15 2-1-3 2,3-二氫苯並呋喃的合成方法 16 2-2 研究動機 17 2-3 實驗結果與討論 18 2-3-1 反應條件優化 18 2-3-2 取代基效應探討 23 2-3-3 控制實驗與反應機構探討 25 2-3-4 不對稱合成初步研究:溶劑及催化劑篩選 27 2-3-5 中心掌性轉換成軸掌性 29 2-4 結論 31 2-5 未來展望 32 2-6 光譜解析 33 2-7 實驗數據與步驟 39 2-7-1 分析儀器 39 2-7-2 實驗步驟 40 2-7-3 化合物數據 42 2-7-4 高效液相層析 (HPLC) 數據 54 2-7-5 X-ray 單晶繞射數據 55 2-8 參考資料(序章、第一部分) 58 2-9 NMR 光譜 60 2-10 Checklist 77 三、第二部分 78 3-1 前言 78 3-1-1 2-胺基4-氫-𠳭唏生物活性 78 3-1-2 2-胺基4-氫-𠳭唏合成方法 79 3-2 研究動機與實驗設計 81 3-3 實驗結果與討論 82 3-3-1 反應條件優化 82 3-3-2 合成 2-胺基-4-氫-𠳭唏衍生物的反應機構探討 90 3-4 結論 93 3-5 未來展望 94 3-6 光譜解析 96 3-7 實驗數據與步驟 101 3-7-1 分析儀器 101 3-7-2 實驗步驟 102 3-7-3 化合物數據 106 3-7-4 高效液相層析 (HPLC) 數據 111 3-7-5 X-ray 單晶繞射數據 113 3-8 參考資料(第二部分) 117 3-9 NMR 光譜 118 3-10 Checklist 124

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