研究生: |
陳恩涵 |
---|---|
論文名稱: |
有機催化劑在分子內Michael加成反應之探討 Organocatalyzed Intramolecular Michael Addition Reaction |
指導教授: | 陳焜銘 |
學位類別: |
碩士 Master |
系所名稱: |
化學系 Department of Chemistry |
論文出版年: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 85 |
中文關鍵詞: | Michael加成反應 、有機不對稱合成 |
英文關鍵詞: | Michael Addition reactiom, Asymmetric organocatalytic synthesis |
論文種類: | 學術論文 |
相關次數: | 點閱:146 下載:3 |
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藉由分子內不對稱Michael加成反應,發展鏡像選擇性多取代環己酮。本實驗使用起始物(E)-5-硝基-6-芳香基己-5-烯-2-酮117,加入20 mol%的金雞納樹生物鹼雙關能基有機催化劑及20 mol%的4-二甲氨基吡啶,在等比例混合之二甲基亞碸及1,4-二氧陸圜為溶劑及50 oC下,經由氫鍵催化進行反應,得到多取代硝基環己酮衍生物,其有不錯的產率及非常好的立體選擇性(>95:5 dr 和高達96% ee);將產物120k,進行還原反應,得到多取代環己醇衍生物,加入甲基磺醯氯以及非親核性鹼,製備甲基磺醯酯衍生物,再經過二步簡單的反應,即可合成天然物(-)地棘蛙素85,本實驗室期望能開發更有效合成路徑,製備天然物活性分子,相關合成應用目前仍在進行中。
Asymmetric organocatalytic Michael addition has attracted interests due to its environmental friendliness and the generation of multiple stereogenic centers in a single step. In this study‚ treatment of (E)-5-nitro-6-arylhex-5-en-2-one using a catalytic amount of quinine-derived primary amine (20 mol%) and 4-dimethyl aminopyridine (20 mol%) in 1,4-dioxane and DMSO (1:1) at 50 oC to give 3,4-trans-
disubstituted cyclohexanones via intramolecular Michael addition process with moderate chemical yields and high-to-excellent stereoselectivities (>95:5 dr and up to 96% ee). We describe a rapid and practical synthetic route involving six-step reaction toward the synthesis of (-)-Epibatidine
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