Glycosidation, VII. Development of Selective Cytostatica for Cancer Therapy Synthesis of Acetal‐β‐glucosides from Cytotoxic Aldehydes

作者: Lutz F. Tietze , Roland Fischer , Hans-J. Guder , Manfred Neumann

DOI: 10.1002/JLAC.198719870839

关键词: AcetalGlycosideChemistryStereochemistryDichloromethaneEtherTrimethylsilylHydrolysisAldehydeTrimethylsilyl trifluoromethanesulfonate

摘要: Aldehydes are highly cytotoxic compounds, but they can normally not be used in cancer therapy because of fast binding to serum proteins. However, could transformed into acetal-β-glucosides 5, a nontoxic transport form, from which freed by enzymatic or acid-catalyzed hydrolysis. The acetyl-protected 4 obtained excellent yield and selectively reaction trimethylsilyl 2,3,4,6-tetra-O-acetyl-β-D-glucopyranoside (1c) an acetal 2 the presence catalytic amounts trifluoromethanesulfonate (3) dichloromethane at −70°C. Deacetylation gives free 5. Similarly, 2,3,4,6-tetra-O-benzyl-β-glucopyranoside (1e) was afford benzyl-protected 6. formation 6 also achieved 1c 1e with aldehyde 8 alkyl ether 7 3. Glycosidierungen, VII. – Entwicklung selektiver Cytostatica fur die Krebs-Therapie. Synthese von Acetal-β-glucosiden cytotoxischen Aldehyden Aldehyde sind stark cytotoxische Verbindungen, jedoch normalerweise nicht Krebs-Therapie eingesetzt werden konnen, da sie schnell durch Bindung Serumproteine desaktiviert werden. Es besteht Moglichkeit, Acetal-β-D-glucoside, eine toxische Transportform, zu uberfuhren, aus der enzymatische oder saurekatalysierte Hydrolyse freigesetzt konnen. Die acetylgeschutzten Acetal-β-glucoside sehr guten Ausbeuten und hochselektiv Umsetzung Trimethylsilyl-2,3,4,6-tetra-O-acetyl-β-D-glucopyranosid einem Acetal Gegenwart katalytischer Mengen Trimethylsilyl-trifluormethansulfonat Dichlormethan bei −70°C erhalten. Entacetylierung ergibt freien In ahnlicher Weise kann Trimethylsilyl-2,3,4,6-tetra-O-benzyl-β-D-glucopyranosid den benzylgeschutzten umgesetzt Bildung gelingt auch Reaktion mit Aldehyden Alkyltrimethylsilylethern 3.

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