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Reaction at -378°C (HF-py, 20 equiv) was sluggish, leaving considerable amounts of unreacted 1,2-orthoester among other compounds, in a complex reaction mixture.
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Reaction at -378°C (HF-py, 20 equiv) was sluggish, leaving considerable amounts of unreacted 1,2-orthoester among other compounds, in a complex reaction mixture.
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Neither 1,6-anhydro derivative formation or 1,2,6 internal orthoester formation were observed:Hiranuma
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A minor saccharide (3-5%) was also detected although its structure remains, at this time, uncertain.
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A minor saccharide (3-5%) was also detected although its structure remains, at this time, uncertain.
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1,2-Orthoesters are normally prepared from fully acylated derivates, thus removal of the protecting groups prior to fluoride formation have the advantage of preserving the 2-O-acyl substituent as a masked, base stable substituent.
-
1,2-Orthoesters are normally prepared from fully acylated derivates, thus removal of the protecting groups prior to fluoride formation have the advantage of preserving the 2-O-acyl substituent as a masked, base stable substituent.
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