A Cascade of Prins Reaction and Pinacol-Type Rearrangement: Access to 2,3-Dideoxy-3C-Formyl β-C -Aryl/Alkyl Furanosides and 2-Deoxy-2C-Branched β-C -Aryl Furanoside

Synthesis and biological profile of substituted hexahydrofuro[3,4-b]furans, a novel class of bicyclic acyl-acyl carrier protein (ACP) thioesterase inhibitors

BACKGROUND

Weed control is a significant challenge for farmers around the globe. Of the various methods available for combatting weeds, small molecules remain the most effective and versatile technology to date. In the search for novel chemical entities with new modes of action toward herbicide-resistant weeds, we have investigated hexahydrofuro[3,4-b]furan-based acyl-acyl carrier protein (ACP) thioesterase inhibitors inspired by X-ray co-crystal structure-based modeling studies.

RESULTS

By exploiting scaffold hopping concepts and molecular modeling studies we were able to identify new hexahydrofuro[3,4-b]furan-based lead structures showing promising activity in vivo against commercially important grass weeds in line with strong target affinity.

CONCLUSION

The present work covers a series of novel herbicidal lead structures that possess a hexahydrofuro[3,4-b]furan scaffold as a structural key feature, carrying ortho-substituted aryloxy side chains. Based on an optimized synthetic approach a broad structure-activity relationship (SAR) study was carried out. The new compounds emerging from our modeling-inspired structural variations show good acyl-ACP thioesterase inhibition in line with promising initial herbicidal activity. Glasshouse trials showed that the hexahydrofuro[3,4-b]furans outlined herein display good control of cold and warm season grass-weed species in pre-emergence application. Remarkably, some of the novel acyl-ACP thioesterase-inhibitors also showed promising efficacy against warm season weeds that are difficult to control. © 2024 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

Stereoselective synthesis of hexahydrofuro[3,4-b]furan-4-ol and its dimer via tandem Prins and pinacol rearrangement

A novel synthetic route for the cyclization of ((4S,5R)-2,2-dimethyl-5-vinyl-1,3-dioxolan-4-yl)methanol with aldehydes to give hexahydrofuro[3,4-b]furan-4-ol and its dimer was developed. A variety of substituted furanol (up to 86%) and its bis-derivatives were obtained in good yields (up to 66%) with excellent diastereo- and enantio-selectivity mediated by borontrifluoride etherate. The dimer was conveniently converted into its corresponding monomer using aqueous zinc(ii) chloride in THF in quantitative yields.