研究生: |
楊景舜 |
---|---|
論文名稱: |
壹. 掩飾鄰苯醌之hetero-Diels-Alder反應研究 貳. 路易士酸催化掩飾鄰苯醌進行1,3-甲氧基重排反應之研究 I. Hetero-Diels-Alder Reactions of Masked o-Benzoquinones II. Lewis Acid-Catalyzed 1,3-Methoxy Rearrangements of Masked o-Benzoquinones |
指導教授: | 廖俊臣 |
口試委員: | |
學位類別: |
博士 Doctor |
系所名稱: |
理學院 - 化學系 Department of Chemistry |
論文出版年: | 2007 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 202 |
中文關鍵詞: | 掩飾鄰苯醌 |
外文關鍵詞: | MOB |
相關次數: | 點閱:1 下載:0 |
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本論文旨在研究掩飾鄰苯醌之hetero-Diels-Alder反應及探討掩飾鄰苯醌於路易士酸下之反應特性,內容共分為兩部份: 第一部份為掩飾鄰苯醌之不對稱hetero-Diels-Alder反應以及利用掩飾鄰苯醌之hetero-Diels-Alder反應進行conduramine A-1之合成;第二部份為掩飾鄰苯醌於路易士酸的催化下進行甲氧基之1,3-重排反應。
第一章: 我們利用薄荷醇衍生物作為親雙烯劑亞硝基化合物之掌性輔助基,並利用萘環來增加薄荷醇衍生物之立體效應,使其與掩飾鄰苯醌進行不對稱hetero-Diels-Alder反應,非鏡像選擇性高達95%。
第二章: 以具有MOM保護的II-57為起始物,氧化生成掩飾鄰苯醌後再與亞硝基化合物進行hetero-Diels-Alder反應可得環加成產物。而此環加成產物已將我們所需要的碳數建構完成,之後經過選擇性還原、水解以及氮氧鍵的切割就可以得到化合物II-64。最後只要將Cbz保護基移除便可獲得天然物conduramine A-1。
第三章: 我們預先製備出掩飾鄰苯醌化合物,之後再加入催化量的路易士酸Rh(COD)2BF4,使掩飾鄰苯醌進行甲氧基的1,3-重排反應。我們亦利用具有親核性的有機溶劑異丙醇來探討反應機構,了解此反應為一可逆反應,且中間體為一個carbocationic化合物。我們也利用一鍋化反應的方式,在同一個反應瓶中產生掩飾鄰苯醌後並接著進行甲氧基的酸重排,其產率達60%。
This thesis focuses on the hetero-Diels-Alder reactions of masked o-benzoquinones (MOBs) and the reactivity of MOBs in the presence of Lewis acids. The research of this thesis consists of three main chapters: chapter one describes the hetero-Diels-Alder reactions of MOBs with chiral nitroso compounds. Chapter two is the synthesis of the natural product conduramine A-1. Finally, chapter three deals with the 1,3-methoxy rearrangement of MOBs catalyzed by Lewis acids.
We utilized nitroso compounds bearing chiral menthol skeleton as a dienophile to examine hetero-Diels-Alder reactions of MOBs. We expected that the naphthalene substitution on the menthol moiety could enhance the shielding effect during the hetero-Diels-Alder process and improve diastereoselectivity. When the MOB is I-21a, the diastereomeric excess of hetero-Diels-Alder reaction is up to 95%.
We then applied the hetero-Diels-Alder reaction of MOBs to the total synthesis of the natural product conduramine A-1. We employed phenol II-57 bearing the MOM protecting group as a starting material. After hetero-Diels-Alder reaction, selective reduction, hydrolysis and N-O bond cleavage, II-64 was obtained. The natural product conduramine A-1 can then be easily obtained by removing Cbz group of II-64.
Finally, we also found that p-quinol ethers can be generated via 1,3-methoxy rearrangement of MOBs catalyzed by Lewis acid. Based on the mechanistic study, we knew that 1,3-methoxy rearrangement of MOBs is a reversible process and the key intermediate is carbocationic species. At last, p-quinol ethers can also be generated from simple phenols by one-pot strategy.
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