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Paper | Regular issue | Vol 38, No. 9, 1994, pp.2017-2022
Published online, 1st January, 1970
DOI: 10.3987/COM-94-6770
1,2,3-Triazolo[5,1-b]thiazoles. Part 3. The Reaction between a Triazolothiazolium Ylide and Acetylenic Dipolarophiles

Belén Abarca,* Rafael Ballesteros, María J. Del Rincón-Guaita, and Gurnos Jones*

*Departamento de Química Orgánica, Facultad de Farmacia, Universidad de Valencia, Avda. Vicente Andres Estelles, 46100, Burjasot (Valencia), Spain


The reaction between 2-methoxycarbonylmethyl-3-methyl-1,2,3-triazolo[5,1-b]thiazolium ylide (5) and methyl propiolate gives the dienes (7) and (8). Existence of this type of diene was postulated in previous papers but they were not isolated. However the reaction of 5 with dimethyl acetylendicarboxylate gives a simple pyrrolo[2,1-b]thiazole system (13).