Issue 37, 2020

Scope of the DMC mediated glycosylation of unprotected sugars with phenols in aqueous solution

Abstract

Activation of reducing sugars in aqueous solution using 2-chloro-1,3-dimethylimidazolinium chloride (DMC) and triethylamine in the presence of para-nitrophenol allows direct stereoselective conversion to the corresponding 1,2-trans para-nitrophenyl glycosides without the need for any protecting groups. The reaction is applicable to sulfated and phosphorylated sugars, but not to ketoses or uronic acids or their derivatives. When applied to other phenols the product yield was found to depend on the pKa of the added phenol, and the process was less widely applicable to 2-acetamido sugars. For 2-acetamido substrates an alternative procedure in which the glycosyl oxazoline was pre-formed, the reaction mixture freeze-dried, and the crude product then reacted with an added phenol in a polar aprotic solvent system with microwave irradiation proved to be a useful simplification.

Graphical abstract: Scope of the DMC mediated glycosylation of unprotected sugars with phenols in aqueous solution

Supplementary files

Article information

Article type
Paper
Submitted
21 ago 2020
Accepted
07 set 2020
First published
07 set 2020

Org. Biomol. Chem., 2020,18, 7355-7365

Scope of the DMC mediated glycosylation of unprotected sugars with phenols in aqueous solution

X. Qiu and A. J. Fairbanks, Org. Biomol. Chem., 2020, 18, 7355 DOI: 10.1039/D0OB01727B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements