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研究生: 卜尼亞
Sabyasachi Bhunia
論文名稱: Discovery of New Carbocyclizations Involving Activation of C–C Multiple Bonds by Electrophilic Noble Metals
指導教授: 劉瑞雄
Liu, Rai-Shung
口試委員:
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: 2010
畢業學年度: 98
語文別: 英文
論文頁數: 533
中文關鍵詞: 催化
外文關鍵詞: gold, platinum, catalyst
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  • 本論文共分成四個章節,主要是探討利用過渡金屬金和鉑催化不同的有機小分子
    化合物。利用此類親炔類的過渡金屬催化,將非環類的基質經由特殊的化學選擇
    性合成出環碳化合物以及雜環化合物。
    第一章節我們發表利用AuCl3 將6-取代-順式-4,6-雙烯-1-炔-3-醇類化合物經由
    6-exo-dig 形成烯丙基羰陽離子,接著進行片吶醇重排反應生成含醛類的環戊烯
    基的架構。此類的環化異構化反應不僅提供了具化學選擇性的合成各種醛類的環
    戊烯基衍生物,也發展出一個嶄新的合成路徑。而最後也利用了具掌性的醛類基
    質環化進行探討。
    第二章節利用鉑(II)金屬錯合物催化2-炔類-1 羰基苯與丙烯基矽烷經由其氧炔類
    官能基和2-取代丙烯基矽烷進行新形式一鍋化烯丙基化以及環化反應。此反應經
    由一連串的骨牌式反應包含了羰基的烯丙基化反應,炔類的烷氧基化以及新型式
    的不飽和-氧正離子環化反應。
    第三章節是我們發表了利用金金屬錯合物催化烯丙基化以及烯炔類的環化反應
    生成1,3 取代的芳香環化合物。利用PPh3AuCl/AgOTf(5/3 mol %)催化炔醛類分
    子與2-取代烯丙基矽烷生成1,3 取代的芳香環化合物。此類反應經由醛類的烯丙
    基化接著進行烯炔類的環化異構化反應而生成,此兩步反應中催化劑PPh3AuOTf
    都扮演著重要的角色。
    第四章節我們以金(I)金屬錯合物催化不飽和丙二烯-乙縮醛官能基,合成具立體
    選擇性的雙環[3.2.1]辛烷-6-烯-2-酮類化合物。此類的環化反應其反應機構是經由
    sp3 混成的碳氫鍵經由1,3 加成至乙烯基類甲烯片段上進行反應。


    This dissertation describes development of some new catalytic systems involving gold
    and platinum salts. The use of these soft alkynophilic metals enables mild,
    chemoselective and efficient transformations of a variety of readily available acyclic
    substrates to a wide range of synthetically useful carbocyclic and heterocyclic
    products. For better understanding the thesis is divided into four chapters.
    The first chapter describes a novel AuCl3-catalyzed cyclization of 6-substituted
    cis-4,6-dien-1-yn-3-ols which proceeds via a 6-exo-dig pathway to give allyl cations,
    which subsequently undergoes a pinacol rearrangement to produce cyclopentenyl
    aldehyde core. This cycloisomerization of enynes via the intermediacy of allyl cation
    not only offered a chemoselective method for the preparation of cyclopentenyl
    aldehyde derivative but also opens up unprecedented reaction routes. Using chiral
    alcohol substrates, such cyclizations proceed with reasonable chirality transfer.
    The second chapter deals with a new one-pot Pt(II)-catalyzed synthesis of
    9-oxabicyclo[3.3.1]nona-2,6-dienes from readily available
    2-alkynyl-1-carbonylbenzenes and allylsilanes through tandem allylation/annulation
    of the oxo-alkyne functionalities with 2-substituted allylsilanes. This reaction
    sequence is proposed to proceed through three domino reactions including allylation
    of the carbonyl group, hydroalkoxylation of the alkyne, and a new ene-oxonium
    annulation.
    The third chapter describes the gold-catalyzed synthesis of 1,3-disubstituted aromatic
    rings through tandem allylation/enyne cyclization reaction. Treatment of alkynals
    with 2-substituted allylsilanes and PPh3AuCl/AgOTf (5/3 mol %) catalyst leads to the
    formation of 1,3-disubstituted benzenes efficiently. This reaction sequence comprises
    an initial allylation of aldehyde, followed by cycloisomerization of enynes;
    PPh3AuOTf is active in both steps.
    The last chapter discusses a stereoselective synthesis of bicyclo[3.2.1]oct-6-en-2-ones
    through Au(I)-catalyzed cycloisomerization of an allenene-acetal functionality. This
    cyclization is mechanistically significant because it involves an unprecedented
    1,3-addition of a sp3-hybridized C–H bond to vinylcarbenoid moiety.

    List of Schemes V List of Tables X List of Publications Xi Abbreviations Xii Chapter I: Gold-catalyzed Cycloisomerization of cis-4,6-dien-1-yne-3-ols via Pinacol Rearrangement. 1.1 Introduction 2 1.1.1. Transition Metal-Catalyzed Enyne Cycloisomerization 2 1.2. Present work 17 1.3. Results and Discussion 17 1.3.1. Synthesis of Substrates 18 1.3.2. Cyclization of 6-substituted cis-4,6-dien-1-yn-3-ols 20 1.3.3. Proposed Mechanism 24 1.3.4. Procedures for Theoretical Calculations 26 1.4. Structure Determination: 27 1.5. Conclusion 28 1.6. Experimental Section 28 1.7. Spectral data 32 1.8. References 46 Chapter II: Platinum-Catalyzed Synthesis of 9-Oxabicyclo[3.3.1]nona-2,6-dienes from 2-Alkynyl-1-carbonylbenzenes and Allylsilanes via Tandem Allylation/Annulation Cascade. 2.1. Introduction 53 2.1.1. Reaction of metal-containing benzopyrylium-type intermediates 54 2.1.2. Reaction of allysilane with aldehyde 60 2.2. Present Work 63 2.3. Results and Discussion 64 2.3.1. Condition Optimization 64 2.3.2. Synthesis of Substrates 67 2.3.3. Annulation of 2-alkynybenzaldehydes with allysilanes 69 2.3.4. Functionalization of oxabicyclic compounds 75 2.4. Mechanistic Study 76 2.4.1. Control Experiment 76 2.4.2. Proposed mechanism 76 2.5. Procedure for calculation of the relative energies of compound 2-22 77 2.6. Conclusion 78 2.7. Experimental Procedure 79 2.8. Spectral data 85 2.9. References 113 Chapter III: Gold-catalyzed Synthesis of 1,3-Disubstituted Benzenes through Tandem Allylation/Cylization Reaction of Alkynals. 3.1. Introduction 122 3.1.1. Allylation by Allylsilane 123 3.1.2. Cascade Allylation and Enynes Cyclization 126 3.1.3. 1,5-enynes cyclization 128 3.2. Present Work 131 3.3. Results and Discussions 131 3.3.1 Condition Optimization 131 3.3.2. Synthesis of Substrates 134 3.3.3. Preparation of 1,3-Disubstituted Benzenes Through Tandem Allylation/Cyclization Cascade 136 3.3.4. Proposed Mechanism 139 3.4. Conclusion 140 3.5. Experimental Procedure 141 3.6. Spectral data 144 3.7. References 157 Chapter IV: Gold-catalyzed 1,3-Addition of a sp3-hybridized C–H bond to Alkenylcarbenoid Intermediate. 1.1. Introduction 166 1.1.1. Types of Carbenes and Metal Carbenes 168 1.1.2. Versatility of Transition Metal-Carbenoids Reaction 169 1.1.3. Cyclopropanation of Olefins 170 1.1.4. 1,2 Hydrogen Shift 172 1.1.5. Skeletal Rearrangement of Enynes 172 1.1.6. Oxidation of Metal Carbenes 174 1.1.7. Insertion of C–H Bond into Metal Carbenoids 174 1.1.7.1. General Trends in Carbenoid C–H Activation Chemistry: 174 1.2. Present Work 178 1.3. Results and Discussion 179 1.3.1. Synthesis of Substrates 180 1.3.2. Preparation of Bicyclo[3.2.1]oct-6-en-2-one Framework by Gold-Catalyzed Reaction of Various 3-allen-1-enyls 181 1.4. Mechanistic Study 185 1.4.1. Deuterium Labeling Experiments 185 1.4.2. Crossover Experiments 187 1.4.3. Proposed Mechanism 187 1.5. Versatility of This Cycloisomerization 189 1.6. Structure Determination 190 1.7. Conclusions 191 1.8. Experimental Procedure 191 1.9. Spectral Data of Key Compounds 194 1.10. References 222 X-ray Crystal Data and 1H & 13C Spectra 229 X-ray Crystal Data of compound 1-19 230 X-ray Crystal Data of compound 4-37 239 1H & 13C Spectra 247

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