Preparation, characterization, and cycloaddition reaction of the heterocumulenes attached directly to azulenes. An efficient strategy for the preparation of azulene-substituted heterocycles

Preparation and cycloaddition reaction of novel azulene-substituted N-sulfinylamines are reported. The influence of the –NSO group on the UV–vis and NMR spectra of the azulene ring to which it is bonded is discussed. X-ray crystal analysis of revealed the syn-configuration and the twisted structure of the N-sulfinylamine moiety. The synthetic utility of have been explored by the cycloaddition reaction to afford novel azulene-substituted heterocycles under high-pressure conditions. We also described herein the synthesis and some properties of related 2-azulenylisothiocyanate.