Synthese du noyau dihydro-5,6 s-triazolo[2,3-d] henzoxazepine-1,4

2-Ethylthio-5 methylene-6H-s-triazolo[2,3-d][1,4] benzoxaze-pine, a new heterocyclic ring system, has been synthesized by cyclisation of the appropriate propargyloxyphenyltriazole. Nucleophilic addition of a triazole nitrogen atom also yields three isomeric by-products, mainly a s-triazolo[2,3-e] [1,5]benzoxazocine.