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研究生: 蘇芳儀
論文名稱: 對掌內酯與對掌內醯胺之不對稱合成
指導教授: 陳焜銘
Chen, Kwun-Min
學位類別: 碩士
Master
系所名稱: 化學系
Department of Chemistry
論文出版年: 2004
畢業學年度: 92
語文別: 中文
論文頁數: 103
中文關鍵詞: 樟腦對掌內酯對掌三級醇對掌內醯胺二碘化釤
英文關鍵詞: camphor, chiral lactone, chiral tertiary alcohol, chiral lactam, samarium diiodide
論文種類: 學術論文
相關次數: 點閱:160下載:13
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  • 內酯與內醯胺官能基存在天然物及具生物活性的藥物分子中,例如對掌γ-butyrolactones,即常出現於昆蟲用來吸引異性的費洛蒙中,許多具特殊氣味的對掌內酯也常添加於芳香物質中。
    本論文報導了二碘化釤催化對掌α,β-不飽和酯類( 104-109 )與酮( 119, 122-124 )及oxime ether反應生成對掌內酯及對掌內醯胺之反應。以本實驗室開發之樟腦為架構新的對掌輔助劑( 101與103 ),接上α,β-不飽和醯氯後,生成不同取代基之α,β-不飽和酯類。以二碘化釤提供電子和扮演路易士酸的角色,使酮及肟產生碳自由基,與對掌α,β-不飽和酯類進行內酯化及內醯胺化反應,對掌內酯及對掌內醯胺均可得到不錯的鏡像超越值(最高達80% ee)。
    在二碘化釤催化下,對掌α,β-不飽和酯類與苯環取代的酮以二甲基二丙醇為質子源在-78 ℃反應,兩小時後於-78 ℃終止反應,得到內酯化反應之中間產物-對掌三級醇,並得到極高的非鏡像超越值(90% de);若反應回至室溫再將其中止,則可得到對掌內酯並有不錯的鏡像超越值。以本實驗室開發之對掌輔助劑衍生之α,β-不飽和酯類,在二碘化釤提供電子及甲醇為質子源條件下與oxime ether反應,於室溫下可得到鏡像超越值最高為55%的對掌內醯胺129,由n-BuLi及(+)-camphorsulfonyl chloride (130)與對掌內醯胺129反應,產物之絕對立體組態由其X-ray ORTEP鑑定為(R)-構形。

    The lactone and lactam functionality are present in a large variety of natural products and biologically active compounds. For example, certain functionalized chiral γ-butyrolactones are sex attractant pheromones for several insect species and some are utilized as flavoring components. They also constitute a particularly useful class of synthons and chiral building blocks.
    A new chiral auxiliary was prepared to react with acyl chloride, and get α,β-unsaturated carbonyl substrates of exo-10,10-diphenyl-2,10-camphanediol. The formation of lactones was carried out by reaction of various chiral auxiliary derivaties α,β-unsaturated olefins and ketones with samarium diiodide in the presence of t-BuOH at -78 ℃. The reaction was stirred at that temperature for 2hr, and then the reaction was gradually warmed to room temperature. Chiral butyrolactones were obtained in 40-70% yield and 70-80% ee, and chiral auxiliary was recovered at the same time. If the reaction was quenched at -78 ℃, we got reaction intermediates-tertiary alcohols with high diasteroselectivity(>88% de), and de value of the product was determined by crude 1H-NMR.
    If oxime ethers was used instead of keones, the lactamization was proceeded at room temperature and the favored γ-butyrolactam was obtained with 55% ee. The absolute stereochemistry of lactam (129) was determined by single crystal X-ray analysis after reacting with camphorsulfonyl chloride and n-BuLi. The ee value of the product was determined by HPLC using chiral column(AS-H, AD).

    第一章 緒論 1.1 前言 1 1.2對掌內酯與對掌內醯胺在有機合成中之應用 1.2.1 合成生物鹼類天然物 1.2.2 合成大環內酯類抗生素之片段 1.2.3 合成氨基酸及其衍生物 1.2.4 合成醣類化合物 1.3 γ-對掌內酯製備之文獻探討 1.3.1 對掌天然物合成γ-對掌內酯 1.3.2對掌烯丙醇合成對掌內酯 1.3.3 劑量對掌引導(chiral induction)試劑合成對掌內酯 1.3.3.1對掌硫試劑合成γ-對掌內酯 1.3.3.2對掌輔助劑合成γ-對掌內酯 1.3.3.3對掌有機金屬試劑合成γ-對掌內酯 1.3.4 二碘化釤製備γ-對掌內酯 1.3.4.0 前言 1.3.4.1二碘化釤與N-methylephedrine衍生物製備γ-對掌內酯 1.3.4.2二碘化釤與對掌配位基(chiral ligand)製備γ-對掌內酯 1.3.4.3二碘化釤與Isosorbide衍生物製備γ-對掌內酯 1.4 γ-對掌內醯胺製備之文獻探討 1.4.1 天然物製備γ-對掌內醯胺 1.4.2 外消旋β-內醯胺製備γ-對掌內醯胺 1.5 研究動機 第二章 結果與討論 2.1 對掌輔助劑及其衍生物的製備 2.1.1 對掌輔助劑的製備 2.1.2 對掌α,β-不飽和酯類的製備 2.2 γ-對掌內酯化反應 2.2.1 對掌內酯化反應之最佳化條件 2.2.1.1 溫度效應 2.2.1.2 添加物效應 2.2.2取代基效應 2.2.2.1 酮之取代基效應 2.2.2.2 對掌α,β-不飽和酯類之取代基效應 2.2.3 由中間產物-對掌三級醇製備對掌內酯 2.2.3.1 最佳合環條件 2.2.3.2 苯環取代基之效應 2.3 對掌α,β-不飽和酯類之γ-對掌內醯胺化反應 2.3.1對掌α,β-不飽和酯類之取代基效應 2.3.2 肟之取代基效應 2.3.3 絕對立體組態之鑑定 2.3.4 溫度效應 2.3.5對掌輔助劑效應 2.3.6 對掌內醯胺化之可能的反應機構 2.4 結論 第三章 實驗部分 3.1 分析儀器 3.2 實驗部分及光譜數據 3.2.1 立體輔助劑的製備 3.2.2 對掌α,β-不飽和酯類及胺類的製備 3.2.3 對掌內酯的製備 3.2.4 肟(oxime)之製備 3.2.5 對掌內醯胺的製備 第四章 參考文獻

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