Aziridineâ(iso)quinoline hybrid systems were prepared as novel synthetic intermediates en route to functionalized (iso)quinolines with potential antimalarial activity. Various quinolinecarboxaldehydes were converted into quinolineâaziridineâpyrazole, âpyridazinone or âpyrimidinone hybrids, and the three-membered azaheterocyclic moiety in these compounds was finally subjected to ring opening by either methanol or water to provide the corresponding functionalized quinolines. In addition, 5-hydroxyisoquinoline was used for the preparation of isoquinolineâaziridine chimeras, which were further transformed into a variety of functionalized isoquinolines via regioselective aziridine ring opening by various nucleophiles. Antiplasmodial evaluation of these new aziridineâ(iso)quinoline hybrids and their ring-opening products revealed micromolar potency (0.22â30 μM) for all representatives against a chloroquine-sensitive strain of the malaria parasite Plasmodium falciparum. The six most potent compounds also showed micromolar activity against a chloroquine-resistant strain of P. falciparum with IC50-values ranging between 1.02 and 17.58 μM.
氮杂环丙烷–(异)
喹啉杂化体系被制备为合成中间体,旨在产出具有潜在抗疟疾活性的功能化(异)
喹啉。各种
喹啉羧醛被转化为
喹啉–
氮杂环丙烷–
吡唑、–
吡嗪酮或–
嘧啶酮杂化物,这些化合物中的三元氮杂环部分最终通过
甲醇或
水开环,得到相应的功能化
喹啉。此外,
5-羟基异喹啉被用于制备
异喹啉–
氮杂环丙烷嵌合体,这些嵌合体又通过各种亲核试剂的区域选择性
氮杂环丙烷开环转化为多种功能化
异喹啉。对这些新型
氮杂环丙烷–(异)
喹啉杂化物及其开环产物的抗疟评估显示,所有代表对疟原虫Plasmodium falciparum的
氯喹敏感株具有微摩尔级的活性(0.22–30 μM)。六种最具活性的化合物对
氯喹耐药株P. falciparum也表现出微摩尔级的活性,IC50值在1.02到17.58 μM之间。