superior imaging properties. The pure enantiomers of unlabeled compounds (S)- and (R)-1 and the corresponding iodonium ylide precursors were synthesized and characterized. The two enantiomers (S)-1 and (R)-1 exhibited comparable high affinity for σ1 receptors and selectivity over σ2 receptors. The Ca2+ fluorescence assay indicated that (R)-1 behaved as an antagonist and (S)-1 as an agonist for σ1 receptors
外消旋的 [ 18 F]FBFP ([ 18 F] 1 ) 被证明是一种有效的σ 1受体放射性示踪剂,具有出色的成像特性。合成并表征了未标记化合物( S )-和( R ) -1的纯对映异构体和相应的
碘鎓叶立德前体。两种对映异构体 ( S ) -1和 ( R ) -1对σ 1 受体表现出相当高的亲和力,对σ 2受体表现出相当高的选择性。Ca 2+荧光测定表明(R)- 1表现为拮抗剂,( S )- 1表现为σ 1受体的激动剂。18 F 标记的对映体 ( S ) - 和 ( R )-[ 18 F] 1从相应的对映体纯
碘鎓叶立德前体获得 > 99% 的对映体纯度,放射
化学产率为 24.4% ± 2.6%,摩尔活性为 86– 214 GBq/微摩尔。在 ICR 小鼠中 ( S )- 和 ( R )-[ 18 F] 1表现出相当高的脑摄取、脑血比、体内在大脑和周围器官中的稳定性和结合特异性。在大鼠的微正电子发射断层扫描