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- W2063519150 abstract "Tri-O-acetyl-5-thio-D-ribopyranosyl bromide was converted into 3,4-di-O-benzoyl-1,5-anhydro-5-thio-D-erythro-pent-1-enitol (3,4-di-O-benzoyl-5-thio-D-ribal), the azidonitration of which afforded an unstable mixture of 2-azido-3,4-di-O-benzoyl-2-deoxy-1-O-nitro-5-thio-D-pentopyranoside++ + isomers. This was converted without separation into the corresponding 1-O-acetyl derivatives from which an alpha,beta anomeric mixture of the 1-O-acetyl-2-azido-3,4-di-O-benzoyl-2-deoxy-5-thio-D-arabinopyranose+ ++ isomers could be isolated in high yield. Glycosidation of this mixture with 4-cyano- or 4-nitrobenzenethiol, using trimethylsilyl triflate or boron trifluoride etherate, respectively, as promoters gave the corresponding D anomers exclusively. Zemplén debenzoylation afforded 4-cyanophenyl as well as 4-nitrophenyl 2-azido-2-deoxy-1,5-dithio-beta-D-arabinopyranoside, respectively. When 1-O-acetyl-2-azido-3,4-di-O-benzoyl-2-deoxy-5-thio-D-lyxopyranose was used as glycosyl donor only the corresponding 1 anomers, i.e., 4-cyanophenyl as well as 4-nitrophenyl 2-azido-2-deoxy-1,5-dithio-beta-D-lyxopyranosides, could be isolated after Zemplén debenzoylation in high yield. All four 1,5-dithioglycosides possess significant oral antithrombotic activity." @default.
- W2063519150 created "2016-06-24" @default.
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- W2063519150 date "2000-04-01" @default.
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- W2063519150 title "Synthesis of 4-cyanophenyl and 4-nitrophenyl 2-azido-2-deoxy-1,5-dithio-β-d-arabino- and -β-d-lyxopyranosides possessing antithrombotic activity" @default.
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- W2063519150 doi "https://doi.org/10.1016/s0008-6215(99)00320-1" @default.
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