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2
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0012862791
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Ernst, B, Hart G. W, Sinay, P. Eds, Wiley-VCH: Weinheim
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b) Panza, L.; Lay, L. In Carbohydrates in Chemistry and Biology; Ernst, B.; Hart G. W.; Sinay, P. Eds.; Wiley-VCH: Weinheim, 2000; Vol. 1, pp. 195-237;
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Panza, L.1
Lay, L.2
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4
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Recent references cited therein
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d) Aoyama, N.; Kobayashi, S. Chem. Lett., 2006, 35, 238-239. Recent references cited therein.
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Chem. Lett
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Aoyama, N.1
Kobayashi, S.2
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6
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a) Yamanoi, T.; Inoue, R.; Matsuda, S.; Katsuraya, K.; Hamasaki, K. Tetrahedron: Asymnetry, 2006, 17, 2914;
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(2006)
Tetrahedron: Asymnetry
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, pp. 2914
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Yamanoi, T.1
Inoue, R.2
Matsuda, S.3
Katsuraya, K.4
Hamasaki, K.5
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7
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b) Yamanoi, T.; Oda, Y.; Matsuda, S.; Yamazaki, I.; Matsumura, K.; Katsuraya, K.; Watanabe, M.; Inazu, T. Tetrahedron, 2006, 62, 10383;
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(2006)
Tetrahedron
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, pp. 10383
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Yamanoi, T.1
Oda, Y.2
Matsuda, S.3
Yamazaki, I.4
Matsumura, K.5
Katsuraya, K.6
Watanabe, M.7
Inazu, T.8
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8
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33745661451
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c) Yamanoi, T.; Matsuda, S.; Yamazaki, I.; Inoue, R.; Hamasaki, K.; Watanabe, M. Heterocycles, 2006, 68, 673;
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Heterocycles
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, pp. 673
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Yamanoi, T.1
Matsuda, S.2
Yamazaki, I.3
Inoue, R.4
Hamasaki, K.5
Watanabe, M.6
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9
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28844459422
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d) Yamanoi, T.; Matsumura, K.; Matsuda, S.; Oda, Y. Synlett, 2005, 2973.
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Synlett
, pp. 2973
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Yamanoi, T.1
Matsumura, K.2
Matsuda, S.3
Oda, Y.4
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10
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33644902624
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3 Adinolfi, M.; Iadonisi, A.; Ravida, A.; Valerio, S. Tetrahedron Lett., 2006, 47, 2595;
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3 Adinolfi, M.; Iadonisi, A.; Ravida, A.; Valerio, S. Tetrahedron Lett., 2006, 47, 2595;
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11
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b) Ikeda, K.; Torisawa, Y.; Nishi, T.; Minamikawa, J.; Tanaka, K.; Sato, M. Bioorg. Med. Chem., 2003, 11, 3073.
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Bioorg. Med. Chem
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Ikeda, K.1
Torisawa, Y.2
Nishi, T.3
Minamikawa, J.4
Tanaka, K.5
Sato, M.6
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12
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38949159913
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Anhydrous calcium sulfate was used as a scavenger for water. We have already investigated the glycosidation catalyzed by a Lewis acid in the presence of several anhydrous salts. Yamanoi, T, Nagamaya, S, Ishida, H.-K, Nishikido, J, Inazu, T. Synth. Commun, 2001, 31, 899
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Anhydrous calcium sulfate was used as a scavenger for water. We have already investigated the glycosidation catalyzed by a Lewis acid in the presence of several anhydrous salts. Yamanoi, T.; Nagamaya, S.; Ishida, H.-K.; Nishikido, J.; Inazu, T. Synth. Commun., 2001, 31, 899.
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13
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38949089905
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Typical glycosidation procedure (Table 1, Entry 4, To a stirred solution of Bi(OTf)3 (5.4 mg, 0.008 mmol) and 5 (20.3 mg, 0.17 mmol) in CH2Cl2 (3 mL) was added 1 (89.2 mg, 0.17 mmol) in the presence of anhydrous CaSO4 (ca. 100 mg) under an Ar atmosphere. The resulting mixture was stirred at reflux temperature for 1.5 min. The reaction was then quenched by the addition of a sat. NaHCO3 solution (5 mL, The reaction mixture was extracted with ethyl acetate, and the organic layer was washed with water and a sat NaCl solution. After the organic layer was dried over Na2SO4, the solvent was evaporated under reduced pressure. The crude product was purified by preparative silica gel TLC (ethyl acetate/hexane=1/3) to give the desired glycoside 10 (92.4 mg, 87, as a colorless oil and the 1,1′-disaccharide 19 α, β-mixture, 8.3 mg, 9, as a colorless oil. All the other glycosides 11-18
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4, the solvent was evaporated under reduced pressure. The crude product was purified by preparative silica gel TLC (ethyl acetate/hexane=1/3) to give the desired glycoside 10 (92.4 mg, 87%) as a colorless oil and the 1,1′-disaccharide 19 (α, β-mixture, 8.3 mg, 9%) as a colorless oil. All the other glycosides 11-18 were similarly prepared and purified by preparative silica gel TLC (11, 12, 14-18: ethyl acetate/hexane = 1/3; 13: toluene/ethyl acetate = 10/1). The spectral data of 11-14, 16, 19-21 are reported in the literatures.
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14
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13244275046
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See, 11: Nagai, H.; Sasaki, K.; Matsumura, S.; Toshima, K. Carbohydr. Res., 2005, 340, 337;
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See, 11: Nagai, H.; Sasaki, K.; Matsumura, S.; Toshima, K. Carbohydr. Res., 2005, 340, 337;
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15
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0034630905
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12 and 13: Garcia, B. A.; Gin, D. Y. J. Am. Chem. Soc., 2000, 122, 4269;
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12 and 13: Garcia, B. A.; Gin, D. Y. J. Am. Chem. Soc., 2000, 122, 4269;
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17
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2542434966
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16
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16: Toshima, K.; Nagai, H.; Kusumi, K.; Kawahara, K.; Matsumura, S. Tetrahedron, 2004, 60, 5331;
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(2004)
Tetrahedron
, vol.60
, pp. 5331
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Toshima, K.1
Nagai, H.2
Kusumi, K.3
Kawahara, K.4
Matsumura, S.5
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18
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0002863675
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19, 20 and 21: Pavia, A. A.; Rocheville, J.-M.; Ung, S. N. Carbohydr. Res., 1980, 79,79.
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19, 20 and 21: Pavia, A. A.; Rocheville, J.-M.; Ung, S. N. Carbohydr. Res., 1980, 79,79.
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19
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38949192078
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2Phβ)
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2Phβ), 73.1 (α), 73.36 (β), 73.41 (α), 74.6 (β), 74.80 (β), 74.82 (α), 74.9 (β), 75.59 (β), 75.60 (α), 77.6 (α), 77.8 (β), 80.0 (C-2α), 81.9 (α), 82.2 (β), 84.6 (β), 96.8 (C-1α), 103.6 (C-1β)
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