| 研究生: |
張凱宣 Kai-Hsuan Chang |
|---|---|
| 論文名稱: |
設計合成新型的唾液酸轉移酶抑制劑 Design and synthesis of sulfur-Cn-linked analogues of CMP-Neu5Ac as potential sialyltransferase inhibitors |
| 指導教授: |
李文仁
Wen-Ren Li 李文山 Wen-Shan Li |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 化學學系 Department of Chemistry |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 101 |
| 中文關鍵詞: | 氫化 、唾液酸轉移酶 、抑制劑 、類固醇 |
| 外文關鍵詞: | sialyltransferase, steroid, inhibitor, hydrogenation |
| 相關次數: | 點閱:12 下載:0 |
| 分享至: |
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Part 1
我們發展出了一種新的氫化方式用來還原鹵烯類化合物。利用Cu(II)/Fe(III)的複合物和hydrazine,可以選擇性的氫化具有類固醇結構的鹵烯類化合物,而有效的合成出17b halo-的類固醇化合物。此類化合物有可能是抗雌激素或是雌激素受體的顯像劑。而此化反應具有高的b立體選擇性且沒有副產物的產生。
Part 2
我們發展出一種新的合成方法來合成含硫烷類或芳香族鏈鍵劑的CMP-Neu5Ac衍生物。此合成方式包含了將peracetylated sialic acid methyl ester和mercaptoalkyl (aryl) trichloroacetate連接在一起,且具有很高的b-立體選擇性。接著可以選擇性的將trichloroacetyl group去掉,而得到hydroxyalkyl及hydroxyaryl thioglycosides。最後經由O-phosphitylation、氧化及去保護的步驟可得到最終產物。
Part 1
A new system for hydrogenation of haloalkenes is reported. Cu(II)/Fe(III)-mediated selective hydrogenation of steroidal haloalkenes in the presence of hydrazine proves to be a very efficient method for the synthesis of 17b-halosteroids, potential candidates as antiestrogens or androgen receptor-mediated imaging agents. The reaction stereo- specifically affords b-haloalkanes without any concomitant formation of dehalogenation products.
Part 2
A new approach to the synthesis of anomeric sulfur analogues of CMP-Neu5Ac containing alkane or arene linkage is described. The procedure involves the high b-stereoselectivity in sialylation of the peracetylated sialic acid methyl ester with mercaptoalkyl (aryl) trichloroacetate, followed by selective deprotection of the trichloroacetyl group to the corresponding hydroxyalkyl and hydroxyaryl thioglycosides. Subsequent O-phosphitylation, oxidation and deprotection led to the isolation of the target compounds.
Part 1
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