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For example, treatment of 4 and 2-mercaptoethyl trimethylsilyl ether (or 2-mercaptoethyl tertbutyldiphenylsilyl ether) with boron trifluoride in dichloromethane gave the desired thioglycoside in low yield, along with the formation of large amounts of bis-(2-trimethylsilyloxyethyl) disulfide or bis-(2-tertbutyldiphenylsilyloxyethyl) disulfide. Condensation of the 2-chlorosialic acid with the 2-mercaptoethyl benzoate gave the thioglycoside in low yield. The products were contaminated with the sialic acid 2,3-elimination product, see: (a) Moreau, V.; Norrild, J. C.; Driguez, H. Carbohydr. Res. 1997, 300, 271. (b) Sabesan, S.; Neira, S.; Davidson, F.; Duus, J.; Bock, K. J. Am. Chem. Soc. 1994, 116, 1616.
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0028147159
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For example, treatment of 4 and 2-mercaptoethyl trimethylsilyl ether (or 2-mercaptoethyl tertbutyldiphenylsilyl ether) with boron trifluoride in dichloromethane gave the desired thioglycoside in low yield, along with the formation of large amounts of bis-(2-trimethylsilyloxyethyl) disulfide or bis-(2-tertbutyldiphenylsilyloxyethyl) disulfide. Condensation of the 2-chlorosialic acid with the 2-mercaptoethyl benzoate gave the thioglycoside in low yield. The products were contaminated with the sialic acid 2,3-elimination product, see: (a) Moreau, V.; Norrild, J. C.; Driguez, H. Carbohydr. Res. 1997, 300, 271. (b) Sabesan, S.; Neira, S.; Davidson, F.; Duus, J.; Bock, K. J. Am. Chem. Soc. 1994, 116, 1616.
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31
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0346159395
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note
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The required compounds 5a-d were prepared from corresponding mercaptoalkyl(aryl) alcohols, respectively, by treating them with trichloroacetyl chloride in dichloromethane at 0°C for 4 h.
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32
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0001131590
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3eq of a β-linked alkyl thioglycoside of sialic acid diplayed a signal upfield relative to that of the corresponding α-anomer, see: (a) Ponpipom, M. M.; Bugianesi, R. L.; Shen, T. Y. Can. J. Chem. 1980, 58, 214. (b) Warner, T. G.; Lee, L. A. Carbohydr. Res. 1988, 176, 211.
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Ponpipom, M.M.1
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33
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0024287766
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3eq of a β-linked alkyl thioglycoside of sialic acid diplayed a signal upfield relative to that of the corresponding α-anomer, see: (a) Ponpipom, M. M.; Bugianesi, R. L.; Shen, T. Y. Can. J. Chem. 1980, 58, 214. (b) Warner, T. G.; Lee, L. A. Carbohydr. Res. 1988, 176, 211.
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Warner, T.G.1
Lee, L.A.2
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0034697651
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Miyazaki, T.; Sato, H.; Sakakibara, T.; Kajihara, Y. J. Am. Chem. Soc. 2000, 122, 5678.
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Miyazaki, T.1
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35
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0348050919
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note
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CMP-Neu5Ac mimetics that contain a spiro-ring.
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36
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0346159394
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note
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3): δ = 5. 89 (d, J = 9.3 Hz, 1 H), 5.44 (s, 1 H), 5.26 (td, J = 4.5, 11.0 Hz, 1 H), 5.21 (m, 1 H), 4.96 (dd, J = 2.1, 12.2 Hz, 1 H), 4.42 (d, J = 10.4 Hz, 1 H), 4.05 (m, 2 H), 3.77 (s, 3 H), 3.75 (m, 1 H), 3.62 (m, 1 H), 2.84 (m, 1 H), 2.76 (m, 1 H), 2.58 (br s, 1 H), 2.50 (dd, J = 4.7, 13.8 Hz, 1 H), 2.12 (m, 1 H), 2.10 (s, 3 H), 2.05 (s, 3 H), 2.00 (s, 3 H), 1.98 (s, 3 H), 1.84 (s, 3 H).
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