A series of 26 novel 1-(7-chloroquinolin-4-yl)-4-nitro-1H-pyrazoles bearing a dichloromethyl and an amino or thio moiety at C3 and C5 has been prepared in yields up to 72% from the reaction of 1,1-bisazolyl-, 1-azolyl-1-amino-, and 1-thioperchloro-2-nitrobuta-1,3-dienes with 7-chloro-4-hydrazinylquinoline. A new way for the formation of a pyrazole cycle from 3-methyl-2-(2,3,3-trichloro-1-nitroallylidene)oxazolidine (6) is also described. In addition, the antimalarial activity of the synthesized compounds has been evaluated in vitro against the protozoan malaria parasite Plasmodium falciparum. Notably, the 7-chloro-4-(5-(dichloromethyl)-4-nitro-3-(1H-1,2,4-triazol-1-yl)-1H-pyrazol-1-yl)quinoline (3b) and 7-chloro-4-(3-((4-chlorophenyl)thio)-5-(dichloromethyl)-4-nitro-1H-pyrazol-1-yl)quinoline (9e) inhibited the growth of the chloroquine-sensitive Plasmodium falciparum strain 3D7 with EC50 values of 0.2 ± 0.1 µM (85 ng/mL, 200 nM) and 0.2 ± 0.04 µM (100 ng/mL, 200 nM), respectively. Two compounds (3b and 10d) have also been tested for anti-SARS-CoV-2, antibacterial, and cytotoxic activity.
一系列含有二氯甲基和氨基或硫醚基的1-(7-氯喹啉-4-基)-4-硝基-1H-吡唑烷衍生物在C3和C5处,从1,1-双唑基、1-唑基-1-氨基和1-硫代高氯酸盐-2-硝基丁烯与7-氯-4-肼基喹啉反应中制备,收率高达72%。此外,还描述了从3-甲基-2-(2,3,3-三氯-1-硝基丙烯基)噁唑烷(6)形成吡唑环的新方法。此外,还评估了合成化合物对原虫疟原虫Plasmodium falciparum的离体抗疟活性。值得注意的是,7-氯-4-(5-(二氯甲基)-4-硝基-3-(1H-1,2,4-三唑-1-基)-1H-吡唑-1-基)喹啉(3b)和7-氯-4-(3-((4-氯苯基)硫醚基)-5-(二氯甲基)-4-硝基-1H-吡唑-1-基)喹啉(9e)分别以EC50值为0.2±0.1 µM (85 ng/mL, 200 nM)和0.2±0.04 µM (100 ng/mL, 200 nM)抑制了对氯喹敏感的Plasmodium falciparum 3D7菌株的生长。两种化合物(3b和10d)还进行了抗SARS-CoV-2、抗菌和细胞毒性活性测试。