Synthesis of a library of fucopyranosyl-galactopyranosides consisting of a complete set of anomeric configurations and linkage positions |
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Authors: | Ohtsuka Isao Ako Takuro Kato Rumiko Daikoku Shusaku Koroghi Satomi Kanemitsu Takuya Kanie Osamu |
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Institution: | Mitsubishi Kagaku Institute of Life Sciences (MITILS), 11 Minamiooya, Machida-shi, Tokyo 194-8511, Japan. |
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Abstract: | A library composed of a complete set of fucopyranosyl-galactopyranosides was synthesized. A perbenzylated phenylthio fucopyranoside and a series of tri-O-benzyl-galactopyranosyl fluorides having single hydroxyl groups at the 2-, 3-, 4-, and 6-positions were used as the glycosyl donor and glycosyl acceptors, respectively. The chosen set of functionalities at the anomeric centers enabled rapid access to the oligosaccharides based on chemoselective activation. The first coupling reaction was achieved by the action of dimethyl(methylthio)sulfonium trifluoromethanesulfonate (DMTST). The resulting disaccharide fluoride was readily activated by hafnocene bistrifluoromethanesulfonate Cp2Hf(OTf)2] and glycosidated with n-octanol. |
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Keywords: | Fucopyranosyl-galactopyranoside Library Deprotection of chloroacetyl group Anomeric mixture Phenylthio glycosides Glycosyl fluorides |
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