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33
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0141490451
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note
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2O, could activate thioglycosides. See also ref 5c.
-
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34
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0141601985
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-
note
-
2O-activated systems.
-
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35
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0001632624
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For a sequential glycosylation procedure using trichloroacetimidates and thioglycosides, see: (a) Yamada, H.; Harada, T.; Takahashi, T. J. Am. Chem. Soc. 1994, 116, 7919-7920. (b) Yamada, H.; Harada, T.; Miyazaki, H.; Takahashi, T. Tetrahedron Lett. 1994, 35, 3979-3982. (c) Yu, B.; Hui, H.; Han, X. Tetrahedron Lett. 1999, 40, 8591-8594.
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For a sequential glycosylation procedure using trichloroacetimidates and thioglycosides, see: (a) Yamada, H.; Harada, T.; Takahashi, T. J. Am. Chem. Soc. 1994, 116, 7919-7920. (b) Yamada, H.; Harada, T.; Miyazaki, H.; Takahashi, T. Tetrahedron Lett. 1994, 35, 3979-3982. (c) Yu, B.; Hui, H.; Han, X. Tetrahedron Lett. 1999, 40, 8591-8594.
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For a sequential glycosylation procedure using trichloroacetimidates and thioglycosides, see: (a) Yamada, H.; Harada, T.; Takahashi, T. J. Am. Chem. Soc. 1994, 116, 7919-7920. (b) Yamada, H.; Harada, T.; Miyazaki, H.; Takahashi, T. Tetrahedron Lett. 1994, 35, 3979-3982. (c) Yu, B.; Hui, H.; Han, X. Tetrahedron Lett. 1999, 40, 8591-8594.
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0141713752
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The successful outcome of a condensation reaction, in which the donor and acceptor are premixed before activation, is determined by the relative nucleophilicities of the anomeric donor function, the anomeric acceptor function, and the free hydroxyl group in the acceptor. See also refs 5c and 13.
-
-
-
-
39
-
-
0141601986
-
-
note
-
Occurrence of this possibility is endorsed by the following experiment: premixing the disarmed thiodonor ethyl 2,3,4,6-tetra-O-benzoyl-1-thioglucopyranoside and the reactive acceptor α-O-methyl-2,3,4-tri-O-benzyl glucose and subsequent treatment of this mixture with 1.0 equiv of the less reactive 2b led to quantitative recovery of the donor glycoside and isolation of the acceptor-6-O-benzenesulfinyl piperidine triflate adduct in 96% yield.
-
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40
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Although ortho ester formation rarely occurs when pivaloyl groups are employed, it has been reported before: Plante, O. J.; Palmacci, E. R.; Andrade, R. B.; Seeberger, P. H. J. Am. Chem. Soc. 2001, 123, 9545-9554.
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47
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0001497362
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For previous syntheses of the α-Gal epitope, see: (a) Garegg, P.; Oscarson, S. Carbohydr. Res. 1985, 136, 207-213. (b) Schaubach, R.; Hemberger, J.; Kinzy, U. Liebigs Ann. Chem. 1991, 607-614. (c) Reddy, G. V.; Jain, R. K.; Bhatti, B. S.; Matta, K. L. Carbohydr. Res. 1994, 263, 67-77. (d) Vic, G.; Tran, C. H.; Scigelova, M.; Crout, D. H. G. Chem. Commun. 1997, 167-170. (e) Nilsson, K. G. I. Tetrahedron Lett. 1997, 38, 133-136. (f) Fang, J.; Li, J.; Chen, X.; Zhang, X.; Wang, J.; Guo, Z.; Zhang, W.; Yu, L.; Brew, K.; Wang, P. G. J. Am. Chem. Soc. 1998, 120, 6635-6638. (g) Hanessian, S.; Huynh, H. K.; Reddy, G. V.; Duthaler, R. O.; Katopodis, A.; Streiff, M. B.; Kinzy, W.; Oehrlein, R. Tetrahedron 2001, 57, 3281-3290.
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For previous syntheses of the α-Gal epitope, see: (a) Garegg, P.; Oscarson, S. Carbohydr. Res. 1985, 136, 207-213. (b) Schaubach, R.; Hemberger, J.; Kinzy, U. Liebigs Ann. Chem. 1991, 607-614. (c) Reddy, G. V.; Jain, R. K.; Bhatti, B. S.; Matta, K. L. Carbohydr. Res. 1994, 263, 67-77. (d) Vic, G.; Tran, C. H.; Scigelova, M.; Crout, D. H. G. Chem. Commun. 1997, 167-170. (e) Nilsson, K. G. I. Tetrahedron Lett. 1997, 38, 133-136. (f) Fang, J.; Li, J.; Chen, X.; Zhang, X.; Wang, J.; Guo, Z.; Zhang, W.; Yu, L.; Brew, K.; Wang, P. G. J. Am. Chem. Soc. 1998, 120, 6635-6638. (g) Hanessian, S.; Huynh, H. K.; Reddy, G. V.; Duthaler, R. O.; Katopodis, A.; Streiff, M. B.; Kinzy, W.; Oehrlein, R. Tetrahedron 2001, 57, 3281-3290.
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, pp. 425-492
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Wang, P.G.1
Bertozzi, C.R.2
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57
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Garegg, P. J.; Olsson, L.; Oscarson, S. J. Org. Chem. 1995, 60, 2200-2204.
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(1995)
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Garegg, P.J.1
Olsson, L.2
Oscarson, S.3
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58
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0141490449
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note
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Several syntheses of hyaluronan oligosaccharides avoid the use of glucuronic acid building blocks for this reason. Alternatively, glucopyranose building blocks are employed that are orthogonally protected on the 6-position, which after deprotection is oxidized at the end of the synthesis. See ref 20.
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