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.
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
Rapid Bis-Coupling Reactivity with Triarylbismuth Reagents: Synthesis of Structurally Diverse Scaffolds and Step-economic Convergent Synthesis of Quebecol
作者:Maddali L. N. Rao、Venneti N. Murty、Sachchida Nand
DOI:10.1002/ejoc.201901830
日期:2020.3.22
The cross‐coupling study of gem‐dibromoesters with triarylbismuths furnished a variety of multi‐functional trisubstituted acrylates embedded with aryl, alkene and alkyne scaffolds in high yields under palladium catalysis. Further, the established method was applied in the step‐economic and convergentsynthesis of quebecol natural product in good yield.