Synthesis and antitumor activity of 1, 2-benzothiazines imidazolo ［1, 2-b］［1, 3, 4］ triazazole derivatives

In this study, triazazole moiety was introduced to piroxicam, a nonsteroidal anti-inflammatory drug, via bioisosterism to produce eight target analogs, which were structurally characterized by ¹H NMR and MS. These target compounds were tested for inhibitory activities on pancreatic cancer cell(Capan-1)and leukemia cell(L1210). The results showed that compound 6b had good antiproliferative activity against Capan-1 cells(IC₅₀=3. 6±0. 5 μmol/L); while compound 6a had good antiproliferative activity against L1210 cells(IC₅₀=1. 8±0. 2 μmol/L), indicating that the introduction of the imidazolo［1, 2-b］［1, 3, 4］triazazole moiety could be helpful to improve the antitumor activity of these compounds.