An efficient and concise synthesis of a beta-(1-->6)-linked D-galactofuranosyl hexasaccharide |
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Authors: | Zhang Guohua Fu Mingkun Ning Jun |
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Institution: | Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, PO Box 2871, Beijing 100085, China. |
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Abstract: | A beta-(1-->6)-linked D-galactofuranosyl hexasaccharide was synthesized efficiently in a block construction manner by the well-known Schmidt glycosylation method using 6-O-acetyl-2,3,5-tri-O-benzoyl-beta-D-galactofuranosyl trichloroacetimidate (1) and allyl 2,3,5-tri-O-benzoyl-beta-D-galactofuranoside (3) as the key synthons. Coupling of 3 with 1 gave beta-(1-->6)-linked disaccharide 4. Subsequent selective deacetylation of 4 afforded the disaccharide acceptor 5, while deallylation of 4 followed by trichloroacetimidate formation produced the disaccharide donor 6. Condensation of 5 with 6 gave the tetrasaccharide 7, and subsequent deacetylation afforded the tetrasaccharide acceptor 8. Finally, coupling of 8 with 6 followed by deacylation yielded the target beta-(1-->6)-linked galactofuranose hexasaccharide 10. All of the reactions in the synthesis were carried out smoothly and in high yield. |
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Keywords: | Galactofuranosyl hexasaccharide Trichloroacetimidate Synthesis |
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