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2. We use the word "exact" to characterize the analogue. It is not possible to review the many bioactive C-glycoside materials that do not have an exact O-analogue for comparison. To cite a few notable cases: (a)
-
2. We use the word "exact" to characterize the analogue. It is not possible to review the many bioactive C-glycoside materials that do not have an exact O-analogue for comparison. To cite a few notable cases: (a) Schmidt, R. R.; Dietrich, H. Angew. Chem., Int. Ed. Engl. 1991, 30, 1328-1329.
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(b) Espinosa, J.-F.; Montero, E.; Vian, A.; Garcia, J. L.; Dietrich, H.; Schmidt, R. R.; Martin-Lomas, M.; Imberty, A.; Canada, F. J.; Jiminez-Barbero, J. J. Am. Chem. Soc. 1998, 120, 1309-1318.
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Free-radical methods: (a) ref 14.
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This protection scheme was implemented (i) to replace KOH-sensitive acetates and (ii) to avoid alkylations with benzyl bromide, which would react with the amide function
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This protection scheme was implemented (i) to replace KOH-sensitive acetates and (ii) to avoid alkylations with benzyl bromide, which would react with the amide function.
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3 is much higher than using the material that has been stored for 1 month in the desiccator
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3 is much higher than using the material that has been stored for 1 month in the desiccator.
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47
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Both Taylor's group and ours have observed clean β-C-glycoside formation upon hydrogenation deoxyglycals, almost certainly due to a chairlike transition state when the hydrogen is transferred to the α-face. Conversely, β-face approach of hydrogen requires a twist-boat like TS during H-transfer
-
Both Taylor's group and ours have observed clean β-C-glycoside formation upon hydrogenation deoxyglycals, almost certainly due to a chairlike transition state when the hydrogen is transferred to the α-face. Conversely, β-face approach of hydrogen requires a twist-boat like TS during H-transfer.
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