研究生: |
高世育 Shih-Yu Gao |
---|---|
論文名稱: |
掩飾鄰苯□與具電子豐盈性親雙烯劑的Diels-Alder 的反應研究 Highly regio- and stereocontrolled Diels-Alder reactions of masked o-benzoquinones with electron-rich dienophiles |
指導教授: |
廖俊臣
Chun-Chen Liao |
口試委員: | |
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: | 2000 |
畢業學年度: | 88 |
語文別: | 中文 |
論文頁數: | 128 |
中文關鍵詞: | 掩飾鄰苯□ 、反常電子需求的 Diels-Alder反應 、具電子豐盈性親雙烯劑 、□基乙烯基醚 、2,3 -二氫□喃 、苯基乙烯基硫醚 、苯乙烯 、雙環[2.2.2.]辛二烯酮 |
外文關鍵詞: | inverse-electron demand Diels-Alder reaction, electron-rich dienophiles, benzyl vinyl ether, 2,3-dihydrofuran, phenyl vinyl sulfide, styrene |
相關次數: | 點閱:2 下載:0 |
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本論文研究係探討掩飾鄰苯□與電子豐盈性烯類的Diels-Alder反應及雙環[2.2.2]辛二烯酮類化合物64a~e的製備。掩飾鄰苯□50分別與4種具電子豐盈性的□基乙烯基醚、2,3-二氫□喃、3,4-二氫□喃、苯基乙烯基硫醚及具共軛性質的苯乙烯進行分子間的Diels-Alder反應,可得單一產物、具高立體選擇性及位向選擇性的雙環辛烯酮化合物51a~g、54a~g、55a、56a~g、57a~h。由RHF/3-21G的理論計算發現 ,此類Diels-Alder反應,可由掩飾鄰苯□的最低未佔用軌域(LUMO)與□基乙烯基醚、2,3-二氫□喃、苯乙烯的最高佔用軌域(HOMO)之相互作用加以解釋。將所得的Diels-Alder產物56a~e,於-78 ℃下,以 m-CPBA氧化,可得高產率的化合物63a~e,再以1,3,5-三甲基苯為溶劑,於迴流溫度下進行脫去反應,即可得到產物64a~e,以供研究光化學反應或其研究它合成之用。
The studies on the Diels-Alder reactions of masked o-benzoquinones (MOBs) 50 with electron-rich dienophiles and synthetic applications of Diels-Alder cycloadducts 56a-e are described. This thesis deals with the Diels-Alder reactions of MOBs with electron-rich dienophiles and the synthesis of bicyclo[2.2.2]octadienone derivatives. Diels-Alder reactions of MOBs 50 with four electron-rich dieno- philes namely, benzyl vinyl ether, 2,3-dihydrofuran, 3,4-dihydropyran and phenyl vinyl sulfide and a conjugated dienophile styrene afforded highly functionalized bicyclo[2.2.2]octenones 51a-g, 54a-g, 55a, 56a-g and 57a-h in high regio- and stereoselectivities. Based on RHF/3-21G* calculations, it is suggested that LUMO of MOBs and HOMO of benzyl vinyl ether, 2,3-dihydrofuran and styrene are involved in the inverse electron-demand Diels-Alder reactions. We have carried out the oxidation of Diels-Alder cycloadducts 56a-e derived from MOBs and phenyl vinyl sulfide with m-CPBA at -78 ℃ to produce the corresponding sulfoxides 63a-e in high yields. The sulfo- xides 63a-e at reflux temperature in mesitylene furnished bicyclo[2.2.2]- octa-2,5-dien-1-ones 64a-e in very good yields. The compounds 64a-e are immediate precursors for heteroaromatic-fused barrelenes, which are very useful starting materials for the photochemical rearrangements.
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