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).
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