研究生: |
陳建盛 Chien-Sheng Chen |
---|---|
論文名稱: |
合成偵測黏多醣症中缺乏a-L-艾杜醣酯□之螢光基質的研究 Synthesis of Fluorogenic Substrates for Detection of a-L-Iduronidase Deficiency in Mucopolysaccharidosis |
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: | 49 |
中文關鍵詞: | 黏多醣症 、螢光試劑 、a-L-艾杜糖酯□ 、7-(4-甲基香豆素基)a-L-艾杜醣酸 、4-甲基-7-羥基香豆素 |
外文關鍵詞: | mucopolysaccharidoses, fluorogenic substrate, a-L-iduronidase, 4-methylcoumarin-7-yl a-L-idopyranosiduronic acid, 4-methyl-7-hydroxycoumarin |
相關次數: | 點閱:3 下載:0 |
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7-(4-甲基香豆素基)a-L-艾杜糖酸1為醫學上用以偵測a-L-艾杜糖酯□之反應活性的檢驗試劑。本論文即描述一簡短且高產率的合成方法來製備化合物1。以具有b-L-艾杜□喃糖骨架之衍生物21或22為起始物,其中,化合物21可由1,2:5,6-二縮丙酮-a-D-葡萄□喃糖23經三步反應而得到,且化合物22可由1,2-縮丙酮-a-D-葡萄□喃糖24經四步反應取得。利用高溫酸性水解反應將21或22轉變成單一的1,6-脫水-L-式艾杜□喃醣19,進行一鍋化乙醯化反應及溴化反應,得到90%高產率的醣予體18,進而與4-甲基-7-羥基香豆素2進行Mitsunobu-type醣基化反應得到加成物36α (58%),以甲醇鈉去除乙醯保護基,取得具有四個羥基的產物11,利用已知的反應選擇性氧化一級醇一步得到目標產物1。
A novel and efficient route toward the formal synthesis of 4-methylcoumarin-7-yl α-L-idopyranosiduronic acid 1, a fluorogenic substrate for assay of α-L-iduronidase activity in Mucopolysaccharidosis, began with the b-L-idofuranoses 21 or 22, available from diacetone α-D-glucose 23 or 1,2-O-isoproplidene-α-D-glucofuranose 24 in four and three steps, respectively. Hydrolysis of 21 or 22 in acidic media at refluxing temperature led to 1,6-anhydroxy-β-L-idopyranose 19 in good yield. One-pot acetolysis and bromination provided 2,3,4,6-tetra-O-acetyl-L-idopyranose 18 (90%) which was coupled with 7-hydroxy-4-methylcoumarin 2 employing the Mitsunobu-type glycosylation to afford the adduct 36α in 58% yield. De-acetylation with sodium methoxide gave the target tetraol 11 (82%) which could be transformed into 1 in one step according to the known method.
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