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For a survey of the chemical synthesis of β-mannopyranosides, see: (a) Gorin. P. A. J.; Perlin, A. S. Can. J. Chem. 1969, 39, 2474. (b) Betaneli, V. I.; Ovchinnikov, M. V.; Backinowsky, L. V.; Kochetkov, N. K. Carbohydr. Res. 1980, 84. 211, 225. (C) Paulsen, H.; Kutsehker, W.; Lockhoff, O. Chem. Ber. 1981, 114, 3102, 3233. (d) Srivastava, V. K.; Schuerch, C. J. Org. Chem. 1981, 46, 1121 (e) Garegg, P. J., Ossowski, P. Acta Chem. Scand. 1983, B37, 229. (f) Rathmore, H.; From, A. H. L.; Ahmed, K.; Fullerton, D. S. J. Med. Chem. 1986, 29, 1945. (g) Gunther, W.; Kunz, H. Angew. Chem., Int. Ed. Engl. 1990, 29, 1050. (h) Yamazaki, N.; Eichenberger. E.; Curran, D. P. Tetrahedron Lett. 1994, 35, 6623. (i) Brunckova, J.; Crich. D.; Yao, Q. Tetrahedron Lett. 1994, 35, 6619. (j) Liu, K. C.; Danishefsky, S. J. J. Org. Chem. 1994, 59, 1892. (k) Lichtenthaler, F. W.; Schneider Adams, Th.; Immel, S. J. Org. Chem. 1994, 59, 6735.
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For a survey of the chemical synthesis of β-mannopyranosides, see: (a) Gorin. P. A. J.; Perlin, A. S. Can. J. Chem. 1969, 39, 2474. (b) Betaneli, V. I.; Ovchinnikov, M. V.; Backinowsky, L. V.; Kochetkov, N. K. Carbohydr. Res. 1980, 84. 211, 225. (C) Paulsen, H.; Kutsehker, W.; Lockhoff, O. Chem. Ber. 1981, 114, 3102, 3233. (d) Srivastava, V. K.; Schuerch, C. J. Org. Chem. 1981, 46, 1121 (e) Garegg, P. J., Ossowski, P. Acta Chem. Scand. 1983, B37, 229. (f) Rathmore, H.; From, A. H. L.; Ahmed, K.; Fullerton, D. S. J. Med. Chem. 1986, 29, 1945. (g) Gunther, W.; Kunz, H. Angew. Chem., Int. Ed. Engl. 1990, 29, 1050. (h) Yamazaki, N.; Eichenberger. E.; Curran, D. P. Tetrahedron Lett. 1994, 35, 6623. (i) Brunckova, J.; Crich. D.; Yao, Q. Tetrahedron Lett. 1994, 35, 6619. (j) Liu, K. C.; Danishefsky, S. J. J. Org. Chem. 1994, 59, 1892. (k) Lichtenthaler, F. W.; Schneider Adams, Th.; Immel, S. J. Org. Chem. 1994, 59, 6735.
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Dan, A.1
Ito, Y.2
Ogawa, T.3
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34
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33845185428
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(a) Kahne, D.; Walker, S.; Cheng, Y.; Van Enaen, D. J. Am. Chem. Soc. 1989, 111, 6881
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(1989)
J. Am. Chem. Soc.
, vol.111
, pp. 6881
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Kahne, D.1
Walker, S.2
Cheng, Y.3
Van Enaen, D.4
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38
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13344252133
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note
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Only one sulfoxide diastereomer was produced (in 89% yield) by oxidation of the corresponding sulfide with m-CPBA. See ref 7 for the synthesis of the sulfide precursor to 3.
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39
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13344289313
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note
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For example, a mixture of 1 equiv of imidazole, 0.5 equiv each of DMAP, mannose sulfoxide 3, and β-methyl glucoside 6 (THF at -78 °C), treated with 0.5 equiv of dichlorodimethylsilane, gave 84% of the corresponding tethered species (cf. 4). Addition of 2 equiv of triflic anhydride to the above in ether - methylene chloride (-100 °C) then gave 12 (65%, after flash Chromatography). See supporting information for more details. The success of this procedure derives from the slower silylation of the 2-hydroxyl derivative of mannose sulfoxide 3 than of the free hydroxyl of the glucose derivative in the cases we have examined. The exact reason is not firmly established.
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40
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33845184508
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Methyl glucoside 6 was prepared from 3,4,6-tribenzvlglucal using the method of: Halcomb, R. L.; Danishefsky, S. J. J. Am. Chem. Soc. 1989, 111, 6661.
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(1989)
J. Am. Chem. Soc.
, vol.111
, pp. 6661
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Halcomb, R.L.1
Danishefsky, S.J.2
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41
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0007054294
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Koto, S.; Morishima, R.; Kawahara, K.; Ishikawa, K.; Zen, S. Bull. Chem. Soc. Jpn. 1982, 55, 631.
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(1982)
Bull. Chem. Soc. Jpn.
, vol.55
, pp. 631
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Koto, S.1
Morishima, R.2
Kawahara, K.3
Ishikawa, K.4
Zen, S.5
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42
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13344289314
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note
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5 hydrogens strongly supports the β-stereochemistry of mannosides 12. 13, and 15. An additional NOE between the anomeric hydrogen and the proximal hydrogen on the glucosidic moiety provided further support for the assigned connectivity.
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43
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13344271778
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note
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Yields for both steps of the method as well as the overall recovery of disaccharide are tabulated below: substrate tethering glycosylation overall 5 89% 92% 82% 6 84% 65% 55% 7 88% 82% 72% 8 98% 12%* 12% 9 60% 48% 29% 10 78% 54%* 42% *The remaining material underwent 6-O-debenzylation (i.e., to 18).
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45
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13344257436
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1H NMR spectra of this product matched that reported by Hindsgaul (see ref 7c)
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1H NMR spectra of this product matched that reported by Hindsgaul (see ref 7c).
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46
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13344252654
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note
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Triflation of 17 produced 12% of 14, 82% of 18, and 4% of the α-anomer of 18. Changing the protecting groups about the mannose substituent (i.e., methyl instead of benzyl ethers) did not alter the outcome of this process.
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47
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13344293376
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note
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5, and anomeric hydrogens within the mannose substituent).
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48
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0013952263
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Stevens, C. L.; Blumbergs, P.; Otterbach, D. H. J. Org. Chem. 1966, 31, 2817.
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(1966)
J. Org. Chem.
, vol.31
, pp. 2817
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Stevens, C.L.1
Blumbergs, P.2
Otterbach, D.H.3
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49
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13344288595
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note
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Glycosylanon of the silaketal from 10 was accompanied by production of 41% of its 6-O-debenzylated product.
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