Synthesis 2023; 55(08): 1285-1297
DOI: 10.1055/a-1975-5291
paper

High-Pressure Activation to Circumvent Product Degradation in the Reaction of Unprotected Glyconitrones with Alkynes

Nathan Noël
,
Gatien Messire
,
Fabien Massicot
,
Jean-Luc Vasse
,
The authors would like to thank the Centre National de la Recherche Scientifique (CNRS) and Univ. Reims Champagne Ardenne (URCA) for financial support. N.N. is grateful to URCA and Ecole Doctorale ABIES for a doctoral allocation.


Abstract

Cycloadditions of nitrones with alkynes usually occur best under heat activation. Due to the instability of the formed isoxazolines, alternative activation methods must be found. Here, hyperbaric conditions are used to transform nitrones generated from unprotected carbohydrates into the corresponding polyhydroxy-isoxazolines at room temperature. The reaction proved completely regioselective in favor of the 5-substituted 4-isoxazolines, and the products are obtained in good yields as mixtures of the two possible diastereoisomers. Further transformations into biologically valuable targets are described. The whole synthesis constitutes a very straightforward procedure for the transformation of aldoses, and is highly compatible with the principles of green chemistry.

Supporting Information



Publication History

Received: 07 October 2022

Accepted: 09 November 2022

Accepted Manuscript online:
09 November 2022

Article published online:
15 December 2022

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