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19
-
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85069145158
-
-
note
-
4), filtered and concentrated in vacuo. The resulting residue was purified by flash column chromatography (typically eluting with hexane:ethyl acetate, 4:1, with 0.1 % triethylamine) to give the mixed ketals as an oil.
-
-
-
-
20
-
-
85069142296
-
-
note
-
4), filtered and concentrated in vacuo. The resulting residue was purified by flash column chromatography (typically hexane:ethyl acetate, 2:1) to yield the pure glycoside.
-
-
-
-
21
-
-
85069128107
-
-
note
-
The tethered mixed ketals were produced as mixtures of diastereomers in all cases and the yields quoted for the tethering steps refer to the combined amount of both. These materials were purified by flash chromatography before being submitted to glycosidation.
-
-
-
-
22
-
-
85069142278
-
-
note
-
3).
-
-
-
-
24
-
-
85069136158
-
-
note
-
In this case both tethering and activation were performed with dichloroethane as solvent.
-
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-
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25
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0027086437
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Zhang, Y.-M.; Mallet, J.-M.; Sinaÿ, P, Carbohydr. Res., 1992, 236, 73.
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Mallet, J.-M.2
Sinaÿ, P.3
-
26
-
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85069138247
-
-
note
-
6 requires: 550.3169).
-
-
-
-
28
-
-
85069134272
-
-
note
-
4), filtered and concentrated in vacuo. The residue was then dissolved in methanol (5 mL), acidic ion exchange resin (-200 mg) added, and the mixture stirred at room temperature overnight. Subsequent filtration and concentration in vacuo yielded a crude product which was purified by flash column chromatography (typically hexane:ethyl acetate, 2:1) to yield the pure glycoside.
-
-
-
-
29
-
-
85069127906
-
-
note
-
In the case of the reaction in dichloroethane, mixed ketal materials were isolated by quenching of the reaction by the addition of thiosulfate after 1 h (at which point the reaction temperature had risen to -20 °C). Subsequent NIS mediated glycosidation of these materials in DCE at room temperature with the addition of 3 equivalents of methanol as a competitive intermolecular nucleophile did not lead to the formation of any methyl glycosides.
-
-
-
-
30
-
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85069135592
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Nicotra, F.; Panza, L.; Ronchetti, F.; Russo, G.; Toma, L. J.Chem.Soc.Perkin Trans .I., 1987, 1319.
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Nicotra, F.1
Panza, L.2
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Russo, G.4
Toma, L.5
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31
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0001558460
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Koto, S.; Morishima, N.; Uchino, M.; Fukuda, M.; Yamazaki, M.; Zen, S. Bull. Chem. Soc. Jpn., 1988, 61, 3943.
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Zen, S.6
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0002018967
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Dessinges, A.; Olesker, A.; Lukacs, G.; That Thang, T. Carbohydr. Res., 1984, 126, C-6.
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