Abstract
Thieno[2′,3′:4,5]pyrimidino[1,2-b][1,2,4,5]tetrazine, [1]benzothieno-[2′,3′:4,5]pyrimidino[1,2-b][1,2,4,5]tetrazine, pyrazolo [3′,4′:4,5]pyrimidino[1,2-b][1,2,4,5]tetrazine, triazolo[4,3-a]pyrimidin-5(1H)-one, 1-{[2-(1-benzofuran-2-yl)-5-phenyl-4,5-dihydro-1H-pyrazol-1-yl]-4-substituted-1,3-thiazol-5-yl}-2-phenyldiazene, 3-acyl-4-(1-benzofuran-2-ylcarbonyl) pyrazole and pyrazolo[3,4-d]pyridazine derivatives could be obtained via reactions of hydrazonoyl halides with the appropriate pyrimidine-2-thione, 3-amino-5,6-dimethyl-2-sulfanylthieno[2,3-d]pyrimidin-4(3H)-one, 5-amino-6-mercapto-1-phenyl-1,5-dihydropyrazolo[3,4-d]pyrimidin-4-one and 1-(benzofuran-2-yl)-3-(dimethylamino)prop-2-en-1-one. Structures of the products have been determined by elemental analyses, spectral data studies and alternative synthesis whenever possible.
