Reaction of aroyl-substituted heterocyclic ketene aminals with nitrile imines: an efficient synthesis of fully substituted pyrazoles and evidence of nucleophilic addition of enamines to 1,3-dipoles

摘要

The 1,3-cycloaddition reaction of aroyl-substituted heterocyclic ketene aminals with nitrile imines proceeded via a nucleophilic addition followed by intramolecular cyclocondensation to give fully substituted pyrazole derivatives. (C) 1999 Elsevier Science Ltd. All rights reserved. [References: 8]