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0042539686
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For a 5,5-dimethyl sugar in a gyrase B inhibitor (novobiocin), see: Laurin P.; Ferroud, D.; Klich, M.; Dupuis-Hamelin, C.; Mauvais, P.; Lassaigne, P.; Bonnefoy, A.; Musicki, B. Bioorg. Med. Chem. Lett. 1999, 2079. For a 5,5-dimethyl sugar in an antibiotic (lipiarmycin), see: Arnome, A.; Nasini, G. J. Chem. Soc., Perkin Trans, 1 1987, 1353.
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For a 5,5-dimethyl sugar in a gyrase B inhibitor (novobiocin), see: Laurin P.; Ferroud, D.; Klich, M.; Dupuis-Hamelin, C.; Mauvais, P.; Lassaigne, P.; Bonnefoy, A.; Musicki, B. Bioorg. Med. Chem. Lett. 1999, 2079. For a 5,5-dimethyl sugar in an antibiotic (lipiarmycin), see: Arnome, A.; Nasini, G. J. Chem. Soc., Perkin Trans, 1 1987, 1353.
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0042539681
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This difficulty has been discussed explicitly, e.g.: Werschkun, B.; Theim, J. Synthesis 1999, 121. Also described in this paper is a Claisen rearrangement approach to introduction of a quaternary center at C-4 of a furanose derivative.
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Werschkun, B.1
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0041537608
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Purchased as 99% ee from the Aldrich Chemical Co.
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Purchased as 99% ee from the Aldrich Chemical Co.
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17
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0042539682
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note
-
This reaction was performed 15 times on a scale of 0.2-5 g. The yields ranged from 95% to 65%, with an average of 78%.
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21
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33845552369
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TEMPO was used in stoichiometric amounts according to an early procedure: Semmelhack, M. F.; Chou, C. S.; Cortes, D. A. J. Am. Chem. Soc. 1983, 105, 4492.
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0042539680
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Based on the procedure of Campaigne, E. and LeSuer, W. M. in Organic Syntheses; Wiley: New York, 1963; Collect. Vol. IV, p 919.
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Collect.
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31
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0043040469
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note
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5).
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-
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32
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0032004105
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-
A few other examples of a β-lactam fused to a pyranose have been examined by X-ray crystallography, but none with the orientation of substitutents (4-amino-5-acyl) of 23. Preparation by a Mitsunobu reaction produced a 4-amino-3-acyl lactam: Zegrodka, O.; Abramski, W.; Urbanczyk-Lipowska, Z.; Chmielewski, M. Carbohydr. Res. 1998, 307, 33. Preparation by a cycloaddition to a glycal produced a 2-amino-3-acyl lactam: Chmielewski, M.; Kaluza, Z.; Suwinska, K.; Rosenbaum, D.; Duddek, H.; Magnus, P. D.; Huffman, J. C. Carbohydr. Res. 1990, 203, 183. Assembly of the pyranose ring onto a β-lactam gave a 3-amino-4-acyl derivative: Hart, D. J.; Leroy, V.; Merriman, G. H.; Young, D. G. J. J. Org. Chem. 1992, 57, 5670.
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Zegrodka, O.1
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-
33
-
-
0010382422
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-
A few other examples of a β-lactam fused to a pyranose have been examined by X-ray crystallography, but none with the orientation of substitutents (4-amino-5-acyl) of 23. Preparation by a Mitsunobu reaction produced a 4-amino-3-acyl lactam: Zegrodka, O.; Abramski, W.; Urbanczyk-Lipowska, Z.; Chmielewski, M. Carbohydr. Res. 1998, 307, 33. Preparation by a cycloaddition to a glycal produced a 2-amino-3-acyl lactam: Chmielewski, M.; Kaluza, Z.; Suwinska, K.; Rosenbaum, D.; Duddek, H.; Magnus, P. D.; Huffman, J. C. Carbohydr. Res. 1990, 203, 183. Assembly of the pyranose ring onto a β-lactam gave a 3-amino-4-acyl derivative: Hart, D. J.; Leroy, V.; Merriman, G. H.; Young, D. G. J. J. Org. Chem. 1992, 57, 5670.
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Chmielewski, M.1
Kaluza, Z.2
Suwinska, K.3
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Duddek, H.5
Magnus, P.D.6
Huffman, J.C.7
-
34
-
-
0001694481
-
-
A few other examples of a β-lactam fused to a pyranose have been examined by X-ray crystallography, but none with the orientation of substitutents (4-amino-5-acyl) of 23. Preparation by a Mitsunobu reaction produced a 4-amino-3-acyl lactam: Zegrodka, O.; Abramski, W.; Urbanczyk-Lipowska, Z.; Chmielewski, M. Carbohydr. Res. 1998, 307, 33. Preparation by a cycloaddition to a glycal produced a 2-amino-3-acyl lactam: Chmielewski, M.; Kaluza, Z.; Suwinska, K.; Rosenbaum, D.; Duddek, H.; Magnus, P. D.; Huffman, J. C. Carbohydr. Res. 1990, 203, 183. Assembly of the pyranose ring onto a β-lactam gave a 3-amino-4-acyl derivative: Hart, D. J.; Leroy, V.; Merriman, G. H.; Young, D. G. J. J. Org. Chem. 1992, 57, 5670.
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