A metal-free tandem approach to prepare structurally diverse N-heterocycles: synthesis of 1,2,4-oxadiazoles and pyrimidinones
作者:Puneet K. Gupta、Mohd. Kamil Hussain、Mohd. Asad、Ruchir Kant、Rohit Mahar、Sanjeev K. Shukla、Kanchan Hajela
DOI:10.1039/c4nj00361f
日期:——
N-heterocycles, namely 1,2,4-oxadiazoles and 2,6 disubstituted pyrimidin-4-ones, have been synthesised in one pot via carboxamidation of amidines with aryl carboxylic acids and aryl propargylic acids under metal-free conditions.
A simple and convenient one-pot procedure for the synthesis of 5- and 6-substituted 2-phenyl-3 H-pyrimidin-4-ones by the condensation of 4-alkoxy-1,1,1-trichloroalk-3-en-2-ones with benz-amidine hydrochloride is described.
A new method for free radical methylation of pyrimidinones and pyridinones with dicumylperoxide (DCP) under metal-free condition is introduced. A 50 g-scale reaction could be performed safely at desired...