The inhibition of ABC (ATP binding cassette) transporters is considered a powerful tool to reverse multidrug resistance. Zosuquidar featuring a difluorocyclopropyl-annulated dibenzosuberyl moiety has been found to be an inhibitor of the P-glycoprotein, one of the best-studied multidrug efflux pumps. Twelve 5-oxyisoquinoline derivatives, which are analogues of zosuquidar wherein the dibenzosuberyl-piperazine moiety is replaced by either a diarylaminopiperidine or a piperidone-derived acetal or thioacetal group, have been synthesized as pure enantiomers. Their inhibitory power has been evaluated for the bacterial multidrug-resistance ABC transporter LmrCD and fungal Pdr5. Four of the newly synthesized compounds reduced the transport activity to a higher degree than zosuquidar, being up to fourfold more efficient than the lead compound in the case of LmrCD and about two times better for Pdr5.
ABC(ATP结合盒)转运蛋白的抑制被认为是逆转多药耐药的有力工具。发现了一种具有二氟环丙基环戊二苯亚基结构的佐苏奎达,它被发现是P-糖蛋白的抑制剂,后者是研究最充分的多药外流泵之一。已合成了十二种5-氧异喹啉衍生物,它们是佐苏奎达的类似物,其中二苯亚基-哌嗪结构被二芳胺哌啶或哌啶酮衍生的缩醛或硫缩醛基团替代,这些衍生物均为纯对映异构体。它们的抑制力已经针对细菌多药耐药ABC转运蛋白LmrCD和真菌Pdr5进行了评估。新合成的四种化合物中有四种比佐苏奎达更有效地降低了转运活性,在LmrCD的情况下高达四倍,对于Pdr5则提高了约两倍。