We report here the synthesis of isoquebecol, an unprecedented constitutional isomer of quebecol, a polyphenolic compound discovered in maple syrup. The methodology used to prepare isoquebecol involves, as key steps, the formation of a dibromoalkene from an α-ketoester precursor, followed by a double Suzuki-Miyaura reaction. The anti-inflammatoryactivity of isoquebecol was studied on macrophage cells
Herein we report our results on the anti-inflammatory activity of quebecol, a polyphenolic compound discovered in maple syrup. Bioassays demonstrated that quebecol has an anti-inflammatory effect on LPS-induced NF-kappa B activation and inhibits the secretion of two pro-inflammatory cytokines, IL-6 and TNF-alpha. We also prepared and tested precursors of quebecol and its derivatives corresponding to its substructures of interest, with the aim to study the structure-activity relationships. Comparing the results obtained for all tested compounds allowed the identification of the main moiety responsible for the anti-inflammatory activity of quebecol. (C) 2015 Elsevier Ltd. All rights reserved.
Total synthesis of quebecol
作者:Sébastien Cardinal、Normand Voyer
DOI:10.1016/j.tetlet.2013.07.048
日期:2013.9
We report here the total synthesis of quebecol, a new polyphenolic compound with potential applications recently isolated from maple syrup and produced during the condensation of the tree acer saccharum's sap. The synthetic approach we developed involves, as key steps, the formation of a dibromoalkene from an alpha-ketoester precursor followed by a double Suzuki-Miyaura reaction to unite the three aromatic rings of the target compound on a tetrasubstituted olefin precursor. Our methodology is an efficient pathway to the target compound and leads the way for future analogs. (C) 2013 Elsevier Ltd. All rights reserved.