Synthesis of functionalized cyclohexenephosphonates and their inhibitory activity towards bacterial sialidases

Efficient synthesis of highly active phospha-isosteres of the influenza neuraminidase inhibitor oseltamivir

With a Hunsdiecker-Barton iododecarboxylation strategy, we converted the carboxylate group of the oseltamivir precursor into exemplary phosphonate monoesters. In all cases, K(i) values towards influenza virus sialidase remained in the sub-nanomolar range. We have thus made valuable structural space available for the design of novel oseltamivir-based tools for influenza virus research.

Building a successful structural motif into sialylmimetics-cyclohexenephosphonate monoesters as pseudo-sialosides with promising inhibitory properties

A variable synthesis of a new class of sialylmimetics which provides access to pseudo-sialosides containing the successful cyclohexene motif in the sialic acid mimicking part has been developed. The D- and L-xylo cyclohexenephosphonate scaffolds allow attachment of selected aglycons or aglycon mimetics via mixed phosphonate diester strategies and some target compounds thus synthesized displayed promising inhibitory properties when tested with parasitic or bacterial sialidases.

Synthesis and evaluation as sialidase inhibitors of xylo-configured cyclohexenephosphonates carrying glycerol side-chain mimics

Based on a strategy previously reported by us, we have synthesized D-xylo configured cyclohexenephosphonates designed to mimic the transition state of the sialidase reaction. The double bond orientation corresponds to the benchmark inhibitor Neu5Ac2en and we could selectively introduce hydroxyalkyl substituents in order to simulate the glycerol side-chain of neuraminic acid. The inhibitory activity of a set of compounds towards bacterial sialidases was tested and interesting differences in activity were found.