Heterocyclic Variants of the Purine System. III. Derivatives of Oxazolo[5,4-e]-1,2,4-Triazine and Oxazolo[4,5-e]-1,2,4-Triazine, Two New Heterocyclic Ring Systems

Abstract

Representative derivatives of the [5,4-e] and [4,5-e] oxazolo-1,2,4-triazine ring systems were prepared by cyclodehydration of the respective 5-acylaminotriazin-6-ones and 6-acylaminotriazin-5-ones. 5-Methylthio-3-phenyltriazin-6-amine also gave a 6-anilino derivative of the [5,4-e] series when treated with phenyl isocyanate, but the method was not a successful route to the [4,5-e] series.