ChemInform Abstract: Heterocumulene‐Mediated Anellation of a (1,3,4)Thiadiazine or (1,3,4)Oxadiazine Ring into an Imidazole Ring: Preparation and Crystal Structure of Some Derivatives of the Unknown Imidazo(1,5‐d)(1,3,4)thiadiazine and Imidazo(1,5‐d)(1,3,4)oxadiazine Ring Systems.

Abstract

The title compounds of type (III) and (VII) are synthesized via aza‐Wittig reaction of the phosphorane (I) with heterocumulenes, e.g. (II) and (VI).