Abstract
Azulenes are of interest in their chemical and physical properties as one of the fundamental nonbenzenoid aromatic compounds. The present article provides a summary of a new synthetic method of azulene derivatives by the reaction of 2H-cyclohepta [b] furan-2-ones with enamines developed mainly in the author's laboratory. This method could be applied to the syntheses of azulene derivatives having alkyl, aryl, and functional substituents, and of polycyclic aromatic compounds containing azulene ring.
