New fluorinated ligands with N-[(1-ethyl-2-pyrrolidinyl)methyl]-2, 3-dihydrobenzofuran-7-carboxamide skeleton, which are useful as a prototype to develop 18F labelled in vivo radiotracer for positron emission tomography (PET), were synthesized, and their binding affinities for the dopamine D2 receptors were investigated. Fluorine atom was introduced at C-4 of the pyrrolidine ring (10) or at ethyl substituent at C-5 of the dihydrobenzofuran moiety (20). The in vitro IC50 values of these ligands for the dopamine D2 receptors which were determined by their ability to inhibit the binding of [3H]spiperone binding in rat striatal membrane were 17 and 36 nM, respectively. Thus, the fluorinated compounds 10 and 20 may be possible candidates for further in vivo investigation.
                                    我们合成了以 N-[(1-乙基-2-
吡咯烷基)甲基]-2, 3-二氢
苯并呋喃-7-甲酰胺为骨架的新型
氟化
配体,并研究了这些
配体与
多巴胺 D2 受体的结合亲和力。在
吡咯烷环(10)的 C-4 位或二氢
苯并呋喃分子(20)的 C-5 位乙基取代基上引入了
氟原子。这些
配体抑制大鼠纹状体膜上[3H]
胡椒酮结合的能力决定了它们对
多巴胺 D2 受体的体外 IC50 值分别为 17 和 36 nM。因此,含
氟化合物 10 和 20 有可能成为进一步进行体内研究的候选化合物。