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- W4288051192 abstract "Abstract Glycosylamine derivatives are biologically relevant compounds widespread in Nature, but the synthesis of this motif has been little addressed and its access with control of configuration at the anomeric carbon is challenging. Glycals substituted at C‐3 with a carbamate group undergo, upon dehydration, a prompt allyl cyanate to isocyanate rearrangement to the isomeric N ‐glycosyl isocyanates, which can be conveniently trapped by one‐pot nucleophilic addition with alcohols or amines to afford N ‐glycosyl carbamates and ureas, respectively. The rearrangement follows a [3,3]‐sigmatropic pericyclic mechanism as illustrated by the stereospecificity of the reaction, with nitrogen being delivered at the anomeric position to the same face from which the oxygen at C‐3 has departed. Thus, glucal and galactal give β‐ N ‐glycosides exclusively while allal furnishes α‐ N ‐glycosides. cis ‐Dihydroxylation of the synthesized unsaturated N ‐glycosides afford different 1‐aminosugars with good selectivity." @default.
- W4288051192 created "2022-07-28" @default.
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- W4288051192 date "2022-08-17" @default.
- W4288051192 modified "2023-09-25" @default.
- W4288051192 title "Stereospecific Access to α‐ and β‐<i>N</i>‐Glycosylamine Derivatives by a Metal Free <i>O</i>‐to‐<i>N</i> [3,3]‐Sigmatropic Rearrangement" @default.
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- W4288051192 doi "https://doi.org/10.1002/ejoc.202200804" @default.
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