A modular approach toward the synthesis of 2,4-disubstituted pyridines
作者:Raju Singha、Shubhendu Dhara、Jayanta K. Ray
DOI:10.1016/j.tetlet.2013.06.092
日期:2013.9
A number of 2,4-disubstituted pyridines have been synthesized using alpha,beta,gamma,delta-unsaturated aldehydes and ammonium chloride in the presence of triethylamine in acetonitrile solvent at 80 degrees C under air balloon. (C) 2013 Elsevier Ltd. All rights reserved.
An efficient synthesis of pyrrole and fluorescent isoquinoline derivatives using NaN3/NH4Cl promoted intramolecular aza-annulation
An efficient synthetic protocol of pyrroles and isoquinolines through NaN3/NH4Cl promoted intramolecular aza-annulation of formyl group with suitable alkenes or alkynes is described in high yield and regioselectivities. The metal free exo-trig and endo-dig aza-cyclisation has been extended for the synthesis of bicyclic or tricyclic pyrroles along with environment sensitive fluorescent isoquinoline