Synthesis of new pyrido[4 ',3 ': 4,5]thieno[2,3-d]-1,2,4-triazolo[3,4-c]pyrimidines and a 5,6-dihydro-1,2,4-triazolo[4 '',3 '': 1 ',2 ']pyrido[4 ',3 ': 4,5]thieno[2,3-d]-pyrimidine ring system
Ek. Ahmed et al., Synthesis of new pyrido[4 ',3 ': 4,5]thieno[2,3-d]-1,2,4-triazolo[3,4-c]pyrimidines and a 5,6-dihydro-1,2,4-triazolo[4 '',3 '': 1 ',2 ']pyrido[4 ',3 ': 4,5]thieno[2,3-d]-pyrimidine ring system, PHARMAZIE, 55(1), 2000, pp. 31-34
A series of substituted pyrido[4',3':4,5]thieno[2,3-d]-1,2,4-triazolo[3,4-c
]pyridimidines 4-6, 8, pyrido[4',3':4,5]thieno[2,3-d]-1,2,4-triazolo[3,4-c]
pyrimidines 11-13 and 5,6-dihydro-1,2,4-triazolo[4",3":1',2']pyrido[4',3':4
,5]thieno[2,3-d]pyrimidines 16-19 have been synthesized from 3, 10 and 15 t
hrough the reaction with orthoesters and carbon disulphide, respectively.