| 研究生: |
郭賓崇 Kuo, Ping-Chung |
|---|---|
| 論文名稱: |
天然藥物資源中新先導藥物之開發研究 Discovery of New Lead Compound from Natural Medicinal Sources |
| 指導教授: |
吳天賞
Wu, Tian-Shung |
| 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: | 2004 |
| 畢業學年度: | 92 |
| 語文別: | 中文 |
| 論文頁數: | 316 |
| 中文關鍵詞: | 抗瘧活性 、細胞毒殺活性 、抗氧化活性 、稜果榕 、東革阿里 |
| 外文關鍵詞: | antioxidant and antityrosinase, dehydrozingerone, acridone, Eurycoma longifolia, Ficus septica |
| 相關次數: | 點閱:116 下載:7 |
| 分享至: |
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從Eurycoma longifolia 根部分離得到69個化合物,經光譜分析與化學方法鑑定確認其結構,其中有10個為天然界首次分離得到之化合物,分別為n-pentyl -carboline-1-propionate、5-hydroxymethyl-9-methoxycanthin-6-one、1-hydroxy-9- methoxycanthin-6-one、eurycomalide A、eurycomalide B、13, 21-dihydroxy- eurycomanol、5, 14, 15-trihydroxyklaineanone、eurycomalin A、sodium vanilliate、sodium protocatechuate等,而除sodium protocatechuate之外,其餘均為首次報導之新化合物。由於本研究分離得到各種不同骨架的quassinoid二萜類,因此歸納整理出其光譜特徵,對於從事此類化合物的研究人員是一項很重要的參考工具。
從稜果榕(Ficus septica)莖部非生物鹼畫分分離得到22個化合物,經光譜分析鑑定確認其結構,包括7個三萜類化合物,2個木質素類化合物,及其他13個已知的化合物,而三萜類化合物中,13, 27-cycloursan-3-yl acetate為天然界首次分離得到之化合物,其所具有的13, 27-cycloursane骨架則為天然界中較少被報導的骨架。
在馬兜鈴酸之合成研究中,利用新的合成路徑,順利合成出1-溴-2, 3-二氧亞甲基-8-甲氧基菲,為馬兜鈴酸-A的前驅物,但產率偏低,仍需進一步改進。
在1, 2, 3, 7-tetrahydroxy-4, 6-dimethoxy-5-methyl-5H-acridin-10-one的合成研究中,順利合成出前驅物7, 11-dihydroxy-4, 6-dimethoxy-5-methyl-5H-[1, 3]dioxolo[4, 5-b]acridin-10-one、2, 3, 7-tribenzyloxy-1, 4, 6-trimethoxy-5-methyl-5H-acridin-10- one,與1-hydroxy-2, 3, 7-tribenzyloxy-4, 6-dimethoxy-5-methyl-5H-acridin-10-one,並將一系列具有acridone骨架的化合物送測生理活性,以評估此類化合物所特有的抗癌作用。
另一方面,採用Whiting方法,利用各種具有不同取代基的苯甲醛類化合物,在鹼性乙醇溶液下與丙酮進行醛醇縮合反應,可得到與天然的抗氧化成分zingerone與dehydrozingerone具有很高的結構相似度之各種不同取代基dehydrozingerone衍生
物。所得的各種不同取代基的dehydrozingerone衍生物,可利用來進行測試其抗氧化與抗酪胺酸酶活性,並送測其抗血小板凝集活性。
在acrovestone衍生物之合成研究部分,7個具有acrovestone類似骨架的化合物順利地利用不同取代的acetophenone類化合物與聚甲醛縮合得到,但經送測對A-549與MCF-7的癌細胞毒殺活性,並未發現其具有特別的細胞毒殺作用。
本研究亦進行了抗氧化與抗酪胺酸酶活性的測試,分別針對前述的各種不同取代基的dehydrozingerone衍生物,以及由黃柏屬植物所分離得到的部份成分,篩選其抗氧化與抗酪胺酸酶活性。除上述的兩種活性測試模式之外,dehydrozingerone衍生物亦進行抗血小板凝集活性測試;由Eurycoma longifolia所分離得到的部份成分與acrovestone衍生物亦測試其抗癌、抗瘧、與抗HIV病毒的活性。其中2', 3'-dihydroxydehydrozingerone具有比vitamin E還強的抗氧化活性;2', 4'-dihydroxy- dehydrozingerone具有比市售的美白化粧品主要成分kojic acid還強的抗酪胺酸酶活性。而由黃柏屬植物葉部所分離得到的主要成分,具有類黃酮骨架的amurensin,具有中等強度的抗氧化活性,值得進一步探討利用黃柏屬植物之葉部開發新的健康食品之可行性。而由Eurycoma longifolia所分離得到的成分eurycomalactone,6-dehydroxylongilactone,9-methoxycanthin-6-one,14, 15-dihydroxyklaineanone,與pasakbumin C對於A-549與MCF-7癌細胞具有很強的細胞毒殺活性;canthin-6-one,longilactone,與canthin-6-one 9-O--glucopyranoside對於A-549癌細胞具有很強的細胞毒殺活性;eurycomanone與pasakbumin B則對MCF-7癌細胞具有很強的細胞毒殺活性,且對於有抗藥性的P. falciparum具有比抗瘧藥物chloroquine更強的抗瘧活性。
Sixty-nine compounds were isolated from the roots of Eurycoma longifolia and they were characterized by comprehensive analyses of their 1D and 2D NMR and mass spectral data, and by chemical transformation studies. Among these isolates, ten compounds were reported for the first time from the natural sources, namely n-pentyl -carboline-1- propionate, 5-hydroxymethyl-9-methoxycanthin-6-one, 1-hydroxy-9-methoxycanthin-6- one, eurycomalide A, eurycomalide B, 13, 21-dihydroxyeurycomanol, 5, 14, 15-trihydroxyklaineanone, eurycomalin A, sodium vanilliate, and sodium protocatechuate. The thorough studies on the spectral characteristics of the different types of quassinoid diterpenoids provided a clear reference to distinguish the quassinoid types at an early stage for the scientists interested in this field.
Seven triterpenes, two lignans, together with thirteen known compounds were isolated from the non-alkaloidal fractions of stem of Ficus septica. Among these triterpenoids, a rare triterpene derivative with 13, 27-cycloursane skeleton, namely, 13, 27-cycloursan-3- yl acetate was isolated from natural sources for the first time. The structures of all these compounds were elucidated by spectroscopic methods.
The precursor of aristolochic acid A, namely, 1-bromo-3, 4-methylenedioxy-8- methoxyphenanthrene was successfully synthesized through a new pathway.
Acridone derivatives, 7, 11-dihydroxy-4, 6-dimethoxy-5-methyl-5H-[1, 3]dioxolo[4, 5-b]acridin-10-one, 2, 3, 7-tribenzyloxy-1, 4, 6-trimethoxy-5-methyl-5H-acridin-10-one, and 1-hydroxy-2, 3, 7-tribenzyloxy-4, 6-dimethoxy-5-methyl-5H-acridin-10-one were synthesized by the coupling of halogenated benzenoid moeity with amino benzoic acid moiety and their spectral data were compared with that of natural product isolated as constituent of Severinia buxifolia. The synthesized acridone derivatives were examined for the cytotoxicity to evaluate their cytotoxic potency.
A series of substituted (E)-4-phenyl-3-buten-2-ones were synthesized by Whiting method through aldol condensation of various substituted benzaldehydes with acetone in basic ethanolic solution, due to the structural similarity with the natural antioxidants, zingerone and dehydrozingerone. These synthetic analogues of dehydrozingerone were examined for their antioxidant and antityrosinase activities to evaluate the structure- activity relationships. In addition, the antiplatelet aggregation activities of some of these synthetic compounds were also screened.
Seven acrovestone derivatives were synthesized by condensation of acetophenones and paraformaldehyde. Their cytotoxicity toward A-549 and MCF-7 tumor cell lines were assayed, but no significant activities were found.
The third part of the thesis consists of bioassays of isolated and synthesized compounds to assess their efficacy as physiological active compound. The synthetic dehydrozingerone analogues and some of the isolates from the leaves of Phellodendron species were examined for their antioxidant and antityrosinase activities. In addition, the dehydrozingerone derivatives were also tested for their antiplatelet aggregation activity. Some of the isolates from the root of E. longifolia were screened for their cytotoxicity, antimalarial and anti-HIV activities in vitro. Among these bioactivity studies, 2', 3'-dihydroxydehydrozingerone exhibited stronger antioxidant activity than vitamin E, and 2', 4'-dihydroxydehydrozingerone displayed antityrosinase activity comparable with that of kojic acid, a commercially whitening agent. Amurensin, the main flavonoid component of the leaves of Phellodendron species, showed moderate antioxidant activity and support the use of Phellodendron species as natural health food. Eurycomalactone, 6-dehydroxy- longilactone, 9-methoxycanthin-6-one, 14, 15-dihydroxyklaineanone, and pasakbumin C displayed strong cytotoxicity toward human cancer cell lines A-549 and MCF-7. Canthin-6-one, longilactone, and canthin-6-one 9-O--glucopyranoside; eurycomanone, and pasakbumin B, exhibited strong cytotoxicity toward A-549 and MCF-7 tumor cell lines, respectively. Eurycomanone and pasakbumin B showed stronger antimalarial activity against the W2 P. falciparum clone than that of chloroquine, a clicnic antimalarial drug.
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