The desired fused ring system 3-(3-chlorophenyl)-6-aryl-5,6-dihydro[1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles 5a-j were synthesized by the reaction of 4-amino-5-(3-chlorophenyl)-4H-1,2,4-triazole-3-thiol and different aryl aldehydes in the presence of catalytic amount of p-TsOH in dry DMF, while 3-(3-chlorophenyl)-6-aryl-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazines 7a-j were synthesized by using...
