HETEROCYCLES

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■ Synthesis of Bridgehead-nitrogen Heterocycles from Pyrylium Salts: Preparation of the Novel Tricyclic Thiazolo[2,3-a]pyrido[2,1-f][1,2,4]triazine Ring System

Pedro Molina, Alberto Tárraga, Mercedes Lorenzo-Peña, and Arturo Espinosa

*Departmento de Química Orgánica, Facultad de Ciencias, Universidad de Murcia, 30071 Murcia, Spain

Abstract

A number of thiazolo[2,3-c]pyrido[2,1-f][1,2,4]triazine derivatives have been prepared by reaction of the 4-oxo-6,8-diphenyl- 3,4-dihydropyrid0[2,1-f][1,2,4]triazin-9-ium-2-thiolate, available from 2-ethoxycarbonyl-4,6-diphenylpyrylium cation and thiosemicarbazide, with phenacyl bromides and subsequent cyclization by the action of acetic anhydride.