Ahsan, Mohamed J., Hassan, Mohd. Zaheen, Jadav, Surender Singh, Geesi, Mohammed H., Bakht, Mohammed Afroz, Riadi, Yassine, Salahuddin, Akhtar, Md. Sayeed, Mallick, Mohammad Nasar, and Akhter, Md. Habban
Oxadiazoles are an important class of heterocyclic compounds, having broad-spectrum activity. They were also reported as anticancer, and antioxidant agents, hence it is of significant importance to explore new oxadiazoles. A series of eleven (5-aryl-N-[4-(trifluoromethyl)phenyl]-1,3,4- oxadiazol-2-amines (6a-k) was synthesized based on the structures of reported compounds, SU-101, IMC38525, and FTAB. All these oxadiazoles were synthesized, characterized by spectral data, and further tested against melanoma, leukemia, colon, lung, CNS, ovarian, renal, breast and prostate cancer cell lines’ panels at a single dose of 10 μM drug concentrations. N-(4-(Trifluoromethyl)phenyl)-5-(3,4- dimethoxyphenyl)-1,3,4-oxadiazol-2-amine (6h) showed significant anticancer activity, and the most sensitive five cell lines were NCI-H522 (% GI = 53.24), K-562 (% GI = 47.22), MOLT-4 (% GI = 43.87), LOX-IMVI (% GI = 43.62), and HL-60(TB) (% GI = 40.30). The compound, 6h revealed better %GIs than imatinib, against 36 cell lines, taking 54 cell lines in common. The maximum sensitivity was recorded against cancer cell line CCRF-CEM (% GI = 68.89) by 2-(5-(4-(trifluoromethyl) phenylamino)-1,3,4-oxadiazol-2-yl)phenol (6f). The antioxidant activity of 4-(5-(4-(trifluoromethyl) phenylamino)-1,3,4-oxadiazol-2-yl)-2-methoxyphenol (6i) was promising with an IC50 of 15.14 μM. It was observed that the oxadiazoles reported herein showed significant anticancer and antioxidant activities.