Preparation of propargyl 1,2-orthoesters of carbohydrates: From side reactions in dichloromethane to optimized reaction conditions in acetonitrile

In this note, supercritical fluid chromatography coupled to high-resolution mass spectrometry (SFC-HRMS) has been used to identify a chloro glycoside formed during the preparation of propargyl 1,2-orthoesters in dichloromethane. Additional studies revealed that 20–40% of this side-product was obtain...

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Veröffentlicht in:Carbohydrate research 2022-11, Vol.521, p.108652-108652, Article 108652
Hauptverfasser: Jouandon, Nicolas, Hammoud, Jana, Touron, Alexandre, Bailly, Laetitia, Le Foll, Alexandra, Joosten, Antoine Y.P., Lecourt, Thomas
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Sprache:eng
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Zusammenfassung:In this note, supercritical fluid chromatography coupled to high-resolution mass spectrometry (SFC-HRMS) has been used to identify a chloro glycoside formed during the preparation of propargyl 1,2-orthoesters in dichloromethane. Additional studies revealed that 20–40% of this side-product was obtained depending on the source of anhydrous solvent, and that tetrabutylammonium iodide amplifies this side-reaction. Finally, a reliable procedure was developed in acetonitrile to prepare these glycosyl donors from perbenzoylated bromo glycosides in manno, gluco and galacto series in 63–74% yield. [Display omitted]
ISSN:0008-6215
1873-426X
0008-6215
DOI:10.1016/j.carres.2022.108652