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標題: (1)Sequential Dy(OTf)3-catalyzed solvent free per-O-acetylation and anomeric de-O-acetylation of carbohydrates (2)2-(acetylsulfanyl)methyl benzoate: Lanthanide(III) metal-catalyzed removable orthogonal protecting group of carbohydrates
(1)利用三氟甲烷磺酸鏑催化醣類分子之乙醯化及一鍋化合成乙醯基化半縮醛之開發 (2)利用三價鑭系金屬催化醣類分子正交性保護基之設計
作者: Yi-Ling Yan
關鍵字: 三價鑭系金屬;三氟甲烷磺酸鏑;三氟甲烷磺酸鐿;乙醯化反應;選擇性移去變旋異構中心乙醯基反應;乙醯基化半縮醛;一鍋化反應;正交性保護基;lanthanide(III) metal;Dy(OTf)3;Yb(OTf)3;per-O-acetylation;anomeric de-O-acetylation;one-pot reaction;orthogonal protecting group
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In the first part of this thesis, we reported dysprosium(III) trifluoromethanesulfonatecatalyzed per-O-acetylation and regioselective anomeric de-O-acetylation of carbohydrates can be tuned by adjusting the reaction medium. In this study, per-O-acetylation of unprotected sugars by using a near stoichiometric amount of acetic anhydride under solvent-free conditions resulted in the exclusive formation of acetylated saccharides as anomeric mixtures, whereas anomeric de-O-acetylation in methanol resulted in a moderate to excellent yield. Reactions with various unprotected monosaccharides followed by a semi-one-pot sequential conversion into the corresponding acetylated glycosyl hemiacetal also resulted in high yields. Furthermore, the obtained hemiacetals could be successfully transformed into trichloroimidates following Dy(OTf)3-catalyzed glycosylation.
The second part of this thesis, we developed the (2-acetylsulfanyl) methyl benzoic acid (ASMB) as a new orthogonal protecting group for carbohydrates. The ASMB group is readily prepared starting from the commercially available, inexpensive 2-methylbenzoic acid. The ASMB group can be selectively removed using ytterbium(III) trifluoromethanesulfonate without affecting a series of common protecting groups. This new protecting group is orthogonal with the commonly used benzoyl, benzyl, Troc, p-methoxybenzyl, tert-butyldimethylsilyl and acetal groups.

  而本篇論文之第二部分,是引入一(2-acetylsulfanyl)methyl benzoic acid (ASMB) 基團作為醣類分子之正交性保護基。在本研究中,是利用三氟甲烷磺酸鐿催化選擇性移去ASMB保護基。其原理是藉由先選擇性去除硫乙醯基而露出硫醇之親核性基團,進而誘導其進行分子內合環反應,形成穩定的硫代內酯,而將此ASMB保護基去除。除此之外,我們並嘗試在醣類分子結構中引入一些常見之保護基,例如苯甲醯基、苄基、Troc、對甲苯甲氧基、叔丁基二甲基矽基及縮醛等,並在此催化條件下進行選擇性去保護反應,由結果顯示,大部分之常見保護基並不會影響,證明此ASMB保護基具有正交性之特性。
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