Two 18F‐radiolabeled organofluorophosphine fluorides ([18F]4 and [18F]7) for chemoselective thiol‐conjugation were designed and synthesized via 18F–19F isotopic exchange reaction. This simple and rapid radiofluorination produced both 18F‐radiolabeled fluorides in excellent radiochemical yields (>94%) and radiochemical purity. The optimal reaction conditions are 0.05‐mg substrate, 0.69 mg of potassium carbonate, and dried [18F]F− were mixed in 100‐μl anhydrous acetonitrile at room temperature for 5 min. Both of [18F]4 and [18F]7 showed specificity for thiol‐conjugation with cysteine and have been used in the radiosynthesis of c (RGDfC). The [18F]7 with an adamantanyl‐hindered substituent displayed superior in vitro and in vivo stability.
我们设计并通过 18F-19F 同位素交换反应合成了两种用于化学选择性巯基连接的 18F 放射标记有机氟化物([18F]4 和 [18F]7)。这种简单快速的放射性氟化反应生成了两种 18F 放射性标记的氟化物,其放射化学收率(>94%)和放射化学纯度都非常高。最佳反应条件是将 0.05 毫克底物、0.69 毫克碳酸钾和干燥的[18F]F-在 100 微升无水乙腈中混合,室温下反应 5 分钟。[18F]4和[18F]7都显示出与半胱氨酸硫醇结合的特异性,并已用于c(RGDfC)的放射合成。带有金刚烷基受阻取代基的[18F]7 在体外和体内都表现出更高的稳定性。