研究生: |
張宗哲 Tsung-che Chang |
---|---|
論文名稱: |
Corey-Chavkovsky 試劑與鄰羥二苯甲酮衍生物之新穎反應的研究 |
指導教授: |
廖俊臣
Chun-Chen Liao 謝興邦 Hsing-Pang Hsieh |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 化學系 Department of Chemistry |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 103 |
中文關鍵詞: | 鄰羥二苯甲酮 、柯雷試劑 |
外文關鍵詞: | Corey-Chavkovsky reagnet |
相關次數: | 點閱:44 下載:0 |
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本論文主旨在於研究Corey-Chavkovsky 試劑1與鄰羥二苯甲酮衍生物61之新穎反應。
根據已報導的文獻知道Corey-Chavkovsky 試劑1與含羰基化合物反應時將進行環氧基化反應,羰基形成將環氧基。這是已經發展40多年來已知著名反應Corey-Chaykovsky環氧化(epoxidation)。原擬定運用Corey-Chavkovsky 試劑1於合成化合物 53,其為抗糖尿病的核心結構,但意外得到化合物55,而化合物55於酸性下合環可得高產率化合物66。鄰羥二苯甲酮61可以進行新穎反應得到重排產物66與3-苯基苯并呋喃69。而於鄰羥二苯甲酮羰基的對位上接上不同取代基,化合物70a~d,均可得到重排產物66a~d產率為20%~45% 與3-取代苯并呋喃產物69a~d 產率為 20%~50% ; 但於鄰羥二苯甲酮的4’位置上接硝基(nitro group)卻沒得到預期的重排產物,而是另一邊的重排產物76e。而其反應機構根據所得產物推測出反應時有四種路徑可以進行。
Corey-Chakovsky’s reagent was used for the synthesis of several derivatives of benzofuran 52, an important building block for the synthesis of antidiabetic drug. Constellations of different substituents at 4 and 4’ positions of 2-Hydrobenzophenone 61、70a~d afforded rearrangement products with varying percentage yields. 2-Hydrobenzophenone 61 furnished 66 and 69 in 20% and 50% yield, respectively. The same rearrangement products were obtained for 2-Hydrobenzophenone 70a-d with percentage yields which ranged from 66a~d 20% to 45% and 69a~d 20% to 50 %. 2-Hydrobenzophenone 70e with nitro substituent at position 4’ did not produce the target molecule; instead compound 76e was produced in 70% yield. A plausible mechanistic interpretation suggests the involvement of four different paths to get different compounds.
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