The design, synthesis, and biological activity of a series of high-affinity, basic ligands for the cholecystokinin-B receptor are described. The compounds, which incorporate a piperidin-2-yl or a homopiperidin-2-yl group attached to C5 of a benzodiazepine core structure, are substantially more basic (e.g., 9d, pKa = 9.48) than previously reported antagonists based on 5-amino-1,4-benzodiazepines (e
描述了胆囊收缩素-B受体的一系列高亲和力,碱性
配体的设计,合成和
生物学活性。该化合物结合了一个与苯二氮卓核心结构的C5相连的
哌啶-2-基或高
哌啶-2-基,其碱性(例如9d,pKa = 9.48)比以前报道的基于5-
氨基的拮抗剂要强得多。 -1,4-
苯并二氮杂卓(例如5,pKa = 7.1)并且具有改善的
水溶性。考虑到它们的基本性,很容易推测本系列化合物可能以其质子化形式与CCK-B受体结合。化合物(例如9d,e和10d)显示出对该受体的高亲和力(IC50 <2.5 nM),并且与CCK-A相比具有非常好的选择性(CCK-A / CCK-B> 2000),甚至是外消旋体。此外,