Department of Chemistry, Faculty of Science Faculty of Pharmacy, University of Mansoura, Mansour Faculty of Science, Al-Azhar University, Cairo, Egypt Manuscript received 6 July 1988, accepted 6 January 1989 Etbyl α-arylazo-β-oxobutyrates (1a-e) undergoes condensation witb 5-aminotetrazole, 2-amino-4-carboethoxythiazole and 3-amino-1-phenyl-2-pyrazolin-5-one to give the linearly fused condensation products (Z, 4 and 5). While tbe condensation of α-arylhydrazonoacetylacetone with

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... zole gives the arylazobeozimida- zolopyrimidines (7). The structures of the compounds were established by analytical and spectral methods.