Regioselective α-arylation of coumarins and 2-pyridones with phenylhydrazines under transition-metal-free conditions
作者:Parul Chauhan、Makthala Ravi、Shikha Singh、Prashant Prajapati、Prem P. Yadav
DOI:10.1039/c5ra20954d
日期:——
A transition-metal-free regioselective α-arylation of coumarins and 2-pyridones has been accomplished by the reaction of phenylhydrazines with coumarins or 2-pyridones.
Iron-Catalyzed Regioselective Direct Arylation at the C-3 Position of <i>N</i>-Alkyl-2-pyridone
作者:Atanu Modak、Sujoy Rana、Debabrata Maiti
DOI:10.1021/jo502362k
日期:2015.1.2
A number of pharmaceutical compounds possess an arylated 2-pyridone moiety. The existing reports using expensive starting materials and/or superstoichiometric metal salts have prompted us to explore a possible user-friendly method for their synthesis. In this report, we demonstrate an easy-to-handle reaction condition with an iron catalyst for the exclusive generation of C-3-arylated pyridone via C–H
A manganese-mediated dehydrogenative direct alkylation of 2-pyridones with diethyl malonates has been developed. A similar reaction system is applicable to the direct arylation with arylboronic acids. These manganese-based reactions occur regioselectively at the C3 position of the 2-pyridones. The observed high C3 regioselectivity can complement precedented C-H functionalization protocols of the 2-pyridones in view of the site selectivity.