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研究生: 呂怡柔
Lu, Yi-Rou
論文名稱: 利用一價銠金屬進行不對稱1,4-加成反應對三尖杉鹼天然物全合成之合成研究
A Synthetic Study Toward the Total Synthesis of (−)-Cephalotaxine Using Rh(I)-Catalyzed Enantioselective 1,4-Addition Reaction
指導教授: 吳學亮
Wu, Hsyueh-Liang
學位類別: 碩士
Master
系所名稱: 化學系
Department of Chemistry
論文出版年: 2020
畢業學年度: 108
語文別: 中文
論文頁數: 158
中文關鍵詞: 一價銠金屬掌性雙環[2.2.1]雙烯配基環狀α,β-不飽和β-酮酯不對稱1,4-加成反應天然物
英文關鍵詞: Rh(I)/chiral diene ligand catalyst, asymmetric 1,4-addition reaction, α,β-unsaturated β-ketoester, natural product
DOI URL: http://doi.org/10.6345/NTNU202001484
論文種類: 學術論文
相關次數: 點閱:42下載:0
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  • 本篇論文探討利用一價銠金屬及掌性雙環[2.2.1]雙烯配基L1形成之催化劑催化芳香基硼酸試劑48對環狀α,β-不飽和β-酮酯47進行不對稱1,4-加成反應。生成加成產物46為單一非鏡像異構物有產率67–99%及鏡像超越值66–99%。此加成產物46可再進行烷基化反應(C-alkylation),建構掌性四級碳之產物45,其產物45產率43–94%及鏡像超越值66–98%。本論文探討利用此方法應用在合成天然物(−)-Cephalotaxine之可能性

    This thesis studies the asymmetric 1,4-addition reaction of arylboronic acids 48 to cyclic α,β-unsaturated β-ketoester 47 catalyzed by a Rh(I)/chiral diene ligand L1 catalyst. The adducts 46 were obtained as a single diastereomer in up to 99% yield and with up to 99% ee. Furthermore, the adducts 46 underwent C-alkylaion reaction to provide products 45 with a chiral quaternary stereogenic center in up to 94% yield and with up to 98% ee. This method was used for the synthetic study toward the total synthesis of natural product (−)-Cephalotaxine.

    第一章 緒論 1 1-1 Cephalotaxine alkaloids的結構、藥性及單離 1 1-2 (−)-Cephalotaxine (−)-1 的合成文獻回顧 3 1-3 (−)-Cephalotaxine (−)-1之逆合成分析 9 第二章 文獻回顧 10 第三章 實驗設計與概念 20 3-1 掌性雙烯配基製備方法 20 3-2 環狀α,β-不飽和β-酮酯的製備方法 22 第四章 實驗結果與討論 23 4-1 探討化合物48及不同取代基之芳香基硼酸試劑49之反應結果 23 4-2 探討解決互變異構作用之方法 26 4-3 立體組態之探討 30 第五章 合成研究 31 第六章 結論 42 第七章 實驗部分 43 分析儀器及基本實驗操作 43 General Procedures for the Synthesis of Compounds 48b、48g[30] 45 General Procedures for Rhodium-Catalyzed Asymmetric 1,4-Addition Reactions 47 General Procedures for One Pot Alkylation Reactions 61 General Procedures for the Synthesis of (−)-Cephalotaxine 74 參考文獻 81 附錄一 84 核磁共振光譜 84

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