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

摘要

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. [References: 43]