Design and synthesis of a folate-receptor targeted diazepine-ring-opened pyrrolobenzodiazepine prodrug conjugate
作者:Iontcho R. Vlahov、Longwu Qi、Hari Krishna R. Santhapuram、Albert Felten、Garth L. Parham、Ning Zou、Kevin Wang、Fei You、Jeremy F. Vaughn、Spencer J. Hahn、Hanna F. Klein、Paul J. Kleindl、Joe Reddy、Dan Reno、Jeff Nicoson、Christopher P. Leamon
DOI:10.1016/j.bmcl.2020.126987
日期:2020.4
development as novel payloads in antibody-drug conjugates (ADCs). However, when used as stand-alone therapeutics or as warheads for small molecule drug conjugates (SMDCs), dose-limiting toxicities are often observed. As an elegant solution to this inherent problem, we designed and synthesized a diazepine-ring-opened bis-PBD prodrug (pro-PBD-PBD) folate conjugate lacking the one of the two imine moieties
吡咯并二氮杂卓(PBD)及其二聚体(bis-PBD)已作为一些最有效的化学治疗化合物出现,目前正在开发为抗体-药物偶联物(ADC)中的新型有效负载。但是,当用作独立疗法或小分子药物偶联物(SMDC)的战斗部时,经常会观察到剂量限制的毒性。作为解决这一固有问题的理想解决方案,我们设计并合成了缺乏在相应的游离bis-PBD中发现的两个亚胺基团之一的二氮杂苯环开环的bis-PBD前体药物(pro-PBD-PBD)叶酸共轭物。进入靶细胞后,接头系统的裂解,包括恶唑烷部分的水解,导致形成具有新形成的醛以及芳族胺的反应性中间体。随后发生快速和自发的分子内闭环反应,这是因为芳族胺加到醛中而失去了水,从而产生了亚胺,因此形成了二氮杂ring环,从而将bis-PBD递送至靶细胞。已经在叶酸受体阳性KB细胞上评估了该结合物的体外和体内活性。已经观察到亚纳摩尔活性具有良好的特异性和高治愈率且毒性最小。