Collect. Czech. Chem. Commun. 1984, 49, 2916-2921

The reaction of 1-phenylmethyl-4N-acetylimino-1H-1,2,4-triazolium betain with butynedioic acid dimethyl ester

Peter Zálupský, Mária Bírošová and Lubor Fišera

Department of Organic Chemistry, Slovak Institute of Technology, 812 37 Bratislava


The reaction between 1-phenylmethyl-4N-acetylimino-1H-1,2,4-triazolium betain(I) and dimethyl butynedioate is decribed. By performing the reaction at ration 1:1 the enamide III is formed. With a fivefold excess of the dipolarophile, except III, also pyrrolo[1,2-d]-triazole XII and pyridine derivative XV were obtained.