Synthesis and Biological Activity of Novel Thieno [2,3-d] [1,2,4] triazolo [4,3-a] pyrimidine and Pyrazolo [3,4-c] pyrazole Derivatives


REACTION of hydrazonoyl halides (2a-e) with either 1,2,3,5,6,7- ..........hexahydro-4H-cyclopenta[4,5]thieno[2,3-d] pyrimidin-2, 4-dithione (1) or 2 (4- Dihydro – 5 – oxo – 3 – methyl - 1H – pyrazolo – 1 – yl ) -5,6,7,8-tetrahydrothieno[2,3-d]pyrimidin-4(3H,4H) -one (11) in the presence of sodium ethoxide in refluxing ethanol / DMF mixture afforded the cyclopenta [4,5]thieno[2,3-d]triazolo [4,3-a]pyrimidines-4-thiones (7a-d) and the phenylpyrazolo[3,4-c]pyrazolcyclopenta [4,5] thieno [2,3-d] pyrimidin-4-ones (14a-e), respectively. The mechanism of the studied reactions has been discussed and the biological activity of the products 7a-d has been evaluated.