A novel green protocol has been developed for the synthesis of quinazolinone–tetrazole conjugates (7a–g, 8a–g and 9a–g) using recyclable nano-CuFe2O3 catalyst in water. Initially, 2-mercapto-3-substituted phenethylquinazolin-4(3H)-one (5a–c) was prepared by using nano-CuFe2O3 catalyst in water. Then, compounds (5a–c) were reacted with 1-bromo-3-chloropropane under nano-CuFe2O3 catalyst in water solvent to give S-alkylated quinazolinone core intermediate (6a–c), which was subsequently reacted with 1-substituted-1H-tetrazole-5-thiol (2a-g) by employing the similar reaction conditions to afford the final target compounds. The regioselective formation of C–S bond was unambiguously confirmed by single-crystal X-ray diffraction. The anti-cancer activity of the derivatives on various cancer cell lines such as SIHA, MD-AMB-231 and HepG2 was evaluated. Remarkably, compounds, 7f, 8f, 9a, 9d and 9f, showed potent activity in MD-AMB-231 cancer cell line (IC50: 9.13–10.3 µM), while the same derivatives showed significant potent activity in SiHa and HepG2 cancer cell lines (IC50: 17.46–27.0 µM). Most significantly, compound 7o (IC50: 8.15 µM) showed potent activity, compared to the drug etoposide (IC50: 18.11 µM) against MD-AMB-231 cell line. Flow cytometry analysis revealed that compounds 7f, 8f, 9a, 9d and 9f arrested the cell growth in the G1 phase in MD-AMB-231 cell line.
利用可回收的纳米 CuFe2O3 催化剂在
水中合成
喹唑啉酮-
四氮唑共轭物(7a-g、8a-g 和 9a-g),开发了一种新的绿色方法。首先,使用纳米 CuFe2O3 催化剂在
水中制备 2-巯基-3-取代的苯乙基
喹唑啉-4(3H)-酮(5a-c)。然后,化合物(5a-c)在纳米 CuFe2O3 催化剂的作用下,在
水溶剂中与
1-溴-3-氯丙烷反应,得到 S-烷基化的
喹唑啉酮核心中间体(6a-c),再与 1-取代的-
1H-四唑-5-
硫醇(2a-g)在类似的反应条件下反应,得到最终的目标化合物。单晶 X 射线衍射明确证实了 C-S 键的区域选择性形成。评估了这些衍
生物对 SIHA、MD-
AMB-231 和 HepG2 等多种癌细胞株的抗癌活性。值得注意的是,化合物 7f、8f、9a、9d 和 9f 在 MD-
AMB-231 癌
细胞系中表现出了强效活性(IC50:9.13-10.3 µM),而相同的衍
生物在 SiHa 和 HepG2 癌
细胞系中也表现出了显著的强效活性(IC50:17.46-27.0 µM)。最重要的是,与
依托泊苷(IC50:18.11 µM)相比,化合物 7o(IC50:8.15 µM)对 MD-
AMB-231
细胞系显示出了强效活性。流式细胞仪分析表明,化合物 7f、8f、9a、9d 和 9f 在 MD-
AMB-231
细胞系中能阻止细胞在 G1 期生长。