A simple and general approach for the synthesis of highly functionalized 6-oxo-1,6-dihydropyridines
作者:Sukeerthi Kumar、Rajni R. Thakur、Sanjay R. Margal、Abraham Thomas
DOI:10.1016/j.tet.2013.04.082
日期:2013.6
A variety of 5-cyano-4-methylthio-6-oxo-1,6-dihydropyridine-3-carboxylates have been efficiently synthesized in a one-pot reaction from N-alkyl and N-aryl derivatives of 2-cyano-3,3-bis(methylthio)acrylamides and selected β-keto esters. The reaction proceeds via potassium hydrogen carbonate mediated conjugate addition of a β-keto ester to 2-cyano-3,3-bis(methylthio)acrylamide followed by loss of methyl
environmentally benign PEG‐400 (PEG=poly(ethyleneglycol)) in the presence of Pd(OAc)2 and novel triazine‐derived multifunctional ligand L1, with which this reaction could afford the structurally diverse mono‐ and double allylated adducts in good to excellent yields as well as good chemo‐ and regioselectivity. In addition, this Pd/L1/PEG‐400 catalyst system could be recycled for five runs with good
This study reported a tandem strategy on sequential base-controlled benzylation/Pd-catalyzed secondary amide arylation for one-pot synthesis of highly functionalized hydroquinolin-2-ones. This strategy involves creation of 3 bonds, 1 ring, and 1 quaternary carbon center while synthesizing diverse 3-cyano substituted hydroquinolin-2-ones in 41–83% yields.