研究生: |
張欣智 Jhang, Sin-Jhih |
---|---|
論文名稱: |
銠金屬(I)/掌性雙烯配體催化芳基硼酸至4-酮基丁烯醯胺化合物行不對稱1,4加成反應 Highly Enantioselective 1,4-Addition Reaction of Arylboronic Acids to 4-Oxobutenamides Catalyzed by Rh(I)/Chiral Diene Complexes |
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: | 2014 |
畢業學年度: | 102 |
語文別: | 中文 |
論文頁數: | 106 |
中文關鍵詞: | 掌性銠金屬催化試劑 、掌性四級碳中心 、2-芳基-4-酮基丁醯胺 |
英文關鍵詞: | chiral rhodium catalyst, quaternary chiral center, 2,4-diaryl-4-oxobutanamindes |
論文種類: | 學術論文 |
相關次數: | 點閱:101 下載:10 |
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本論文敘述以2莫耳百分比的一價銠金屬 (Rh) 與掌性雙烯配位基(chiral- diene ligand) 所形成的金屬錯合物,在最佳化條件下(24 °C,乙醇為溶劑,KHF2(aq)為添加劑),催化芳基硼酸進行不對稱1,4-加成反應至(E)-1-嗎啉基-4-芳基丁烯-1,4-二酮 (16a)。可得一系列具有掌性中心的2-芳基-4-酮基丁醯胺產物,其產率最高可至99%,鏡像超越值最高也可達99.5%。
在合成應用上,以加成產物 18a作為起始物合成出α位置上為掌性四級碳中心的內酯46。此反應過程經由以NaBH4進行還原反應; 2) 酸性條件下環化成內酯,得其非鏡像異構物比例為2比1的一對非鏡像異構物45a及45b ; 3) 烷化步驟中合成出具有掌性四級碳中心的內酯46及其鏡像異構物ent-46。
This thesis describes the preparation of chiral 2,4-diaryl-4-oxobutanamindes from asymmetric conjugate addition reaction of various arylboronic acids to (E)-1-morpholino-4-arylbut-2-ene-1,4-dione 16. In the presence of 2 mol% of chiral rhodium catalyst comprising of [RhCl(C2H4)2]2 and chiral diene ligand 12e, the catalytic reaction proceeds in a high diastereoselective fashion to provide the corresponding adducts 18 with a C2-stereogenic center in up to 99% yield and >99.5% ee in EtOH using KHF2(aq) as an additive.
In the synthetic application, compound 18a was transformed into enantiomeric isomers bearing a quaternary chiral center at the α–position of lactone compound 46. The sequence of the transformation involves 1) reduction of compound 18a with NaBH4; 2) the resulting diastereomeric isomers, with an approximate ratio of 2:1, were subjected to acid-catalyzed translactonization to yield 45a and 45b, respectively; 3) respective treatment of compound 45a and 45b with LDA at −78 °C and followed by MeI offered lactone 46 and its enantiomer ent-46.
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