| 研究生: |
鄭竹均 Cheng, Chu-chun |
|---|---|
| 論文名稱: |
合成娃兒藤鹼 Synthesis of Tylophorine |
| 指導教授: |
吳耀庭
Wu, Yao-ting |
| 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: | 2009 |
| 畢業學年度: | 97 |
| 語文別: | 中文 |
| 論文頁數: | 75 |
| 中文關鍵詞: | 合成娃兒藤鹼 |
| 外文關鍵詞: | Synthesis of Tylophorine |
| 相關次數: | 點閱:71 下載:1 |
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本論文之目的以發展簡單的合成方法,用以製備菲類衍生物,並期望可應用於娃兒藤鹼的全合成。我們嘗試數種不同的合成方法,其中以2,2'-雙碘聯苯衍生物與炔類化合物反應為最佳的合成方法。反應條件最適化是以醋酸鈀( 0.1當量)作為催化劑,加入2當量的醋酸銀,在對位二甲苯的溶劑下,加熱至140 ℃,反應24小時,進行環化加成,合成出菲類化合物(產率45-70 %,5例)。此反應具有很好的官能基容忍度,例如: 芳香族羥基、烷基、矽化基等皆可反應。將此合成條件進一步應用於合成娃兒藤鹼,2,2'-雙碘-4,4',5,5'-四甲氧基聯苯(2,2'-diiodo-4,4',5,5'-
tetramethoxybiphenyl)與2-(3-(三甲矽基)丙炔基)吡咯烷-2-羧酸叔丁酯(tert-butyl 2-(3-(trimethylsilyl)prop-2-ynyl)pyrrolidine-1-carboxylate)反應可得到娃兒藤鹼前驅物(產率70 %),而後於酸性條件下進行環化加成反應,得到娃兒藤鹼,這是目前所知道合成娃兒藤鹼的最短步驟。
The goal of this research is to develop a simple synthetic method for the generation of phenanthrenes, and for the application in the preparation of tylophorine. Several synthetic methods have been tested, and apparently, reaction of 2,2'-diiodobiphenyls with internal alkynes is the best choice. In the optimized reaction conditions [Pd(OAc)2 (10 mol%) and AgOAc (2 equiv) in p-xylene at 140 ºC for 1 days], phenanthrene derivatives could be obtained in 60-70% yield (five examples). This protocol tolerates some functional groups, such as aryl, alkyl, trimethylsiyl group, etc. On the basis of the phenanthrene studies the cycloadditon of 2,2'-diiodo-4,4',5,5'- tetramethoxybiphenyl (46) and tert-butyl 2-(3-(trimethylsilyl)-prop-2-ynyl)pyrroli-dine-1-carboxylate (79) provided the desired tylophorine precursor in 70 % yield. In the presence of formaldehyde and hydrochloric acid, phenanthrene (71) in-situ underwent the Pictet-Spengler cyclization to give tylophine (82 %). To the best of our knowledge, this is the shortest synthetic rote for the preparation of the target molecule.
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