HETEROCYCLES

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■ The Cleavage of Heterocyclic Compounds IV. Study of the Reactivity of the [1]Benzothieno[2,3-e][1,2,4]triazine System towards Nucleophilic Reagents

Jiří Filipčík, Jakub Stýskala,* and Jan Slouka

*Department of Organic Chemistry, Palacky University, Trida Svobody 8, 77146 Olomouc, Czech Republic

Abstract

A series of 5-substituted 1,2,4-triazines were prepared by nucleophilic cleavage of the thiophene ring of [1]benzothieno[2,3-e][1,2,4]triazine 1 with some nitrogen, oxygen, sulfur and carbon containing nucleophilic agents. The thiophene ring of compound 1 was transformed by oxidative cleavage to the corresponding sulfonic acid 10.