研究生: |
許岱欣 |
---|---|
論文名稱: |
Eremophilane類天然物: (±)-Eremopetasidione, (±)-3β-Angeloyloxyfuranoeremophilane, (±)-3β-Methacryloyloxyfuranoeremophilane及二倍半萜類酸天然物: (±)-Bilosespenes A, B的合成研究 |
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: | 2003 |
畢業學年度: | 91 |
語文別: | 中文 |
論文頁數: | 181 |
中文關鍵詞: | eremophilane 、二倍半萜類酸 、天然物 、合成 |
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合成應用,內容共分為兩部份:第一部份係掩飾鄰苯醌在eremophilane類天然物:(±)-eremopetasidione (8), (±)-3β-angeloyloxyfuranoeremophilane (25)及(±)-3β-methacryloyloxy-furanoeremophilane (26)之全合成;第二部份係掩飾鄰苯醌在二倍半萜類酸102及103之全合成。
第一部份:以2-甲氧基-4-甲基酚(77)為起始物,經由二乙醯基亞碘苯氧化、分子間Diels-Alder反應、烯醇矽醚的形成及Cope重排反應得到具有十氫萘骨架化合物79。化合物79在10%的草酸水溶液水解、還原及去縮酮基反應,可得關鍵化合物73。化合物73進行羰的α-乙醯化反應及氧化反應得到天然物(±)-eremopetasidione (8)。化合物73與化合物68進行aldol反應及以酸催化脫水成環反應,得到呋喃化合物93,最後再分別進行酯化,得天然物(±)-3β-angeloyloxyfuranoeremophilane (25)及(±)-3β-methacryloyloxyfuranoeremophilane (26)。
第二部份:同樣以2-甲氧基-4-甲基酚(77)為起始物,經由二乙醯基亞碘苯氧化及分子內Diels-Alder反應得參環化合物133。化合物133進行羰基加成反應及陰離子oxy-Cope重排反應,得到參環化合物172,將化合物172氫化、烷基化及去縮酮基反應得到具有十氫萘骨架化合物176。接著進行羰基還原、硒醚化合物的生成、水解及氧化消去反應,得到具有環外雙鍵化合物181,最後將化合物181進行Horner-Emmons反應及皂化反應即完成二倍半萜類酸102的全合成。化合物102利用對苯甲酸進行雙鍵異構化,得到化合物103。但是所得之化合物102及103與天然的(±)-bilosespenes A及B其氫與碳核磁共振光譜並不相同。
The thesis consists of two parts: the first part describes the total syntheses of eremophilanoid natural products: (±)-eremopetasidione (8), (±)-3β-angeloyloxyfuranoeremophilane (25) and (±)-3β-methacryloyl- oxyfuranoeremophilane (26). In the second part describes the total syntheses of sesterpenoid acids: 102 and 103.
The cis-decalin 79 was obtained from 2-methoxy-4-methylphenol (77) via a sequence of reactions involving intermolecular Diels-Alder reaction of masked o-benzoquinone derived from 77 and ethyl vinyl ketone, silyl enol ether formation and Cope rearrangement. Hydrolysis of compound 79 with 10% aqueous oxalic acid followed by reduction and deketalization furnished key intermediate 73. Selective α-acetylation of compound 73 and DDQ oxidation accomplished the total synthesis of (±)-eremopetasidione (8). Aldol reaction of compound 73 with acetonyl tetrahydropyranyl ether (68) followed by treatment with acidic aqueous tetrahydrofuran provided 3β-hydroxyfuranoeremophilane (93). Finally, esterification of furan 93 was effected with angeloyl chloride and methacryloyl chloride to accomplish the total syntheses of (±)-3β-angeloyloxyfuranoeremophilane (25) and (±)-3β-methacryloyl- oxyfuranoeremophilane (26), respectively.
The tricyclic compound 172 was obtained via intramolecular Diels-Alder reaction of masked o-benzoquinone, produced in situ from oxidation of 2-methoxy-4-methylphenol (77) with DAIB in the presence of allyl alcohol, followed by addition and anionic oxy-Cope rearrangement. Hydrogenation of compound 172 and deketalization furnished cis-decalin 176. Transformation of compound 176 into compound 181 was achieved in 4 steps. Finally, the total synthesis of sesterpenoid acid 102 was accomplished by means of Horner-Emmons reaction and saponification. Compound 102 was isomerized into 103 when treated with p-toluenesulfonic acid in dichloromethane. However, our 1H and 13C NMR spectra of 102 and 103 are found to be somewhat different from those of natural products.
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