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A series of 2-methylthio-pyrido-triazolopyrimidines ( 1 - 17 ) were prepared by the reaction of dimethyl- N -cyanoimidodithiocarbonate with hydrazinopyridine carboxylic acid as starting reactants. Their chemical structures were affirmed with HREI-MS, IR and NMR analyses. The target compounds ( 1 - 17 ) were evaluated for their antioxidant activity using 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical scavenging, ferric reduction antioxidant power (FRAP) and reducing power capability (RPC). The results revealed that some pyrido-triazolopyrimidines showed good activity as antioxidant agents, in particular, compounds  12  and  15  were found to possess good antioxidant activity. Butylated hydroxyl toluene (BHT) was used as reference drug.

Synthesis and antioxidant activity of 2-methylthio-pyrido[3,2- e ][1,2,4] triazolo[1,5- a ]pyrimidines