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Stereoselective ethynylation and propargylation of chiral cyclic nitrones: application to the synthesis of glycomimetics

AutorGarcía-Viñuales, Sara; Delso, J. Ignacio; Merino, Pedro ; Tejero, Tomás
Palabras claveNitrones
Glycomimetics
Alkynes
Ethynylation
Propargylation
Fecha de publicación2016
EditorThieme
CitaciónSynthesis 48(19): 3339-3351 (2016)
ResumenEthynylation and propargylation of chiral nonracemic polyhydroxylated cyclic nitrones with Grignard reagents are efficient methods for preparing building blocks containing an alkyne moiety to be used in copper-catalyzed azide alkyne cycloaddition click chemistry. Whereas ethynylation takes place with excellent diastereoselectivity, propargylation afforded mixtures of diastereomers in some cases. The use of (trimethylsilyl)propargyl bromide as precursor of the Grignard reagent is necessary to avoid the formation of undesired allene derivatives. DFT calculations explain, within the experimental error, the observed behavior. Cycloaddition of the obtained pyrrolidinyl alkynes with sugar azides derived from β-(1,3)-glucans provides glycomimetics suitable to be used against fungal transglycosylases.
Versión del editorhttps://doi.org/10.1055/s-0035-1562500
URIhttp://hdl.handle.net/10261/155721
DOI10.1055/s-0035-1562500
Identificadoresdoi: 10.1055/s-0035-1562500
e-issn: 1437-210X
issn: 0039-7881
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