1. Systematic syntheses of influenza neuraminidase inhibitors: A series of carbosilane dendrimers uniformly functionalized with thioglycoside-type sialic acid moieties
- Author
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Sakamoto, Jun-Ichi, Koyama, Tetsuo, Miyamoto, Daisei, Yingsakmongkon, Sangchai, Hidari, Kazuya I.P.J., Jampangern, Wipawee, Suzuki, Takashi, Suzuki, Yasuo, Esumi, Yasuaki, Nakamura, Takemichi, Hatano, Ken, Terunuma, Daiyo, and Matsuoka, Koji
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DENDRIMERS in medicine , *NEURAMINIDASE , *DRUG development , *SIALIC acids , *ENZYME inhibitors , *TRANSESTERIFICATION , *VIRUS-induced enzymes , *STRUCTURE-activity relationship in pharmacology , *INFLUENZA viruses , *SILANE compounds - Abstract
Abstract: In order to develop novel influenza sialidase inhibitors, we constructed a library of glycoclusters composed of twelve types of sialylated dendrimers with thioglycosidic linkage that are resistant to hydrolysis by the sialidases. These sialodendrimers were synthesized by condensation reaction between a thiosialoside modified on the aglycon terminal end by a thioacetyl group and twelve types of carbosilane dendrimers having brominated terminal ends under deacetylation conditions, and temporal re-protection was performed for purification. Removal of all protection of the glycodendrimers was accomplished by transesterification and subsequent saponification to provide corresponding water-soluble glycodendrimers in good yields. For investigation of the structure–activity relationship, dendrimer scaffolds having differences in number of the sugar moieties, such as 3-, 4-, 6- and 12-functionalized dendrimers, and in linkage patterns, such as normal aliphatic linkage, ether- and amide-linkages. Biological evaluations of these glycodendrimers showed that all of the ether- and amide-elongated compounds had inhibitory potencies for the influenza sialidases in the mM range, while compounds having normal aliphatic linkage did not have any activities except for a 12-functionalized compound. [Copyright &y& Elsevier]
- Published
- 2009
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