Cyanothioacetamide in Heterocyclic Synthesis: A Novel Synthesis of Styrylpyridinethione, Styrylthieno[2,3-b]pyridine, Styrylpyrazolo[3,4-b]pyridine, Pyrido[2′,3′:3,4]pyrazolo[5,1-a]pyrimidine, Pyrido[3′,2′:4,5]thieno[3,2-d]pyrimidine and Pyrido[3′,2′:4,5]thieno[3,2-d]-1,2,3-triazin-4-one Derivatives

Abstract

Synthesis of 6-styrylpyridinethione 6a-d , 6-styrylthienopyridine 11a- d , 15a-d , pyrido[2',3':3,4]pyrazolo[5,1-a]pyrimidine 25 , 29 , pyrido[3', 2':4,5]thieno[3,2-d]pyrimidine 34 , and pyrido[3',2':4,5]thieno[3,2-d]-1,2,3-triazin-4-one 35 derivatives by the reaction of 4a , b , 6a-d , 22 , 33 , with 5a , b , 9 , 13 , 23 , 27 , acetic anhydride and nitrous acid respectively.

Keywords:

• Cyanothioacetamide
• Pyridopyrazolopyrimidine
• Pyridothienotriazinone
• Styrylpyrazoloopyridine
• Styrylthienopyridine