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姓名 李隆翔(Long-Shiang Li) 查詢紙本館藏 畢業系所 化學學系 論文名稱 天然物(+)Pericosine A, B and C 的合成研究 相關論文 檔案 [Endnote RIS 格式] [Bibtex 格式] [相關文章] [文章引用] [完整記錄] [館藏目錄] [檢視] [下載]
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摘要(中) 本篇論文是以D-ribose作為起始物合成目標天然物(+)-Pericosine A-C。主要的反應有Wittig 反應、Swern 氧化。以[-(Alkoxycarbonyl)-vinyl]aluminum 作具有非鏡像選擇性的羰基加成反應得到中間產物8a和 8b。雖然此非鏡像混合物可以管柱層析法分離,我們也發展出改變反應條件 ( 添加過氯酸鋰 ) 可以得到不同的主產物,並探討了此非鏡像立體選擇性的原因。化合物8a經由甲基化反應( methylation )、環合置換 ( Ring-Closing Metathesis ) 反應合環,可得到天然物 (+)-Pericosine B。化合物8b使用相同的策略可以合成天然物 (+)-Pericosine C。而天然物(+)-Pericosine A可在8a經由環合置換反應後,參考Stevenson教授的合成方法而得。 摘要(英) Successfully synthesizing natural product (+)-Pericosine A-C was the aim. The main reactions are Wittig reaction and Swern oxidation. Diastereomeric intermediates 8a and 8b were acquired through [-(Alkoxycarbonyl)-vinyl]aluminum doing stereoselective nucleophilic reaction. Though diastereomers 8a and 8b could be separated by column chromatography, changing reaction condition by adding LiClO4 was found to result in different major product; simultaneously, we did some researches on the cause leading to different stereoselectivity. Natural product (+)-Pericosine B was synthesized by compound 8a subjected to methylation, Ring-Closing Metathesis. On the other hand, natural product (+)-Pericosine C was obtained by using the same way as (+)-Pericosine B on compound 8b. Last but not least, (+)-Pericosine A was obtained by using compound 8a through Ring-Closing Metathesis directly referring to Prof. Stevenson’s method. 關鍵字(中) ★ 非鏡像立體選擇性
★ 貝里斯-希爾曼反應
★ 有機鋁試劑關鍵字(英) ★ diastereoselectivity
★ Baylis-Hillman reaction
★ organoaluminum reagent論文目次 中文論文摘要 …………………………………………………………. II
Abstract ……………………………………………………………….. III
總目錄 ………………………………………………………………… IV
圖目錄 ………………………………………………………………… V
附圖目錄 ……………………………………………………………… VII
第一章 前言 ………………………………………………………….. 1
1-1 研究目的 ……………………………………………… 1
1-2 合成Pericosine A-C的文獻探討 …………………… 2
1-3 Baylis-Hillman reaction介紹 ………………………… 9
1-4 [-(Alkoxycarbonyl)vinyl]aluminum reaction介紹 ….. 11
第二章 結果與討論 ………………………………………………….. 14
2-1 逆合成分析 …………………………………………… 14
2-2 重要中間物 8a 與8b的合成 ………………………… 15
2-3 解釋[-(Alkoxycarbonyl)vinyl]aluminum reaction得到
兩種不同選擇性的結果 ……………………………… 20
2-4 2-4 合成天然物(+)-pericosine A& B& C ……………. 26
2-5 證實(+)-Pericosine B& C的結構 …………………….. 32
2-6 以不同保護基的醛類來探討非鏡像選擇性………….. 36
第三章 結論 ………………………………………………………….. 39
第四章 實驗 ………………………………………………………….. 40
4-1 溶媒及處理程序 ……………………………………… 40
4-2 實驗器材與儀器 ……………………………………… 40
4-3 實驗步驟 ……………………………………………… 42
第五章 參考文獻 …………………………………………………….. 66參考文獻 第五章 參考文獻
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