Reaction of bromo- or iodo-substituted isatoic anhydrides with
N-methylglycine, L-proline or D-proline afforded bromo-
or iodo-substituted 1,4-benzodiazepinediones which on condensation with ethyl
or t-butyl isocyanoacetates gave ethyl or t-butyl bromo- or
iodo-imidazobenzodiazepine carboxylates. These aryl halides were converted
into the corresponding tributylstannanes with bis(tributyltin) in the presence
of (triphenylphosphine)palladium(0), and the stannanes were treated with
sodium (123I)iodide in the presence of chloramine-Tto
give the required 123I- labelled analogues of the
imidazobenzodiazepine receptor ligands flumazenil and bretazenil.
溴代或碘代异丁烯酸酐与
N-甲基甘氨酸、L-脯氨酸或 D-脯氨酸反应,得到溴代或碘代的 1,4-苯并二氮杂环庚二酮。
或碘代的 1,4-苯并二氮杂环庚二酮,在与乙基或叔丁基异氰基乙酸酯缩合后
异氰基乙酸乙酯或异氰基乙酸叔丁酯缩合后,得到溴代或碘代咪唑苯并
碘咪唑并二氮杂卓羧酸酯。这些芳基卤化物
在(三苯基膦)存在下,用双(三丁基锡)将这些芳基卤化物转化为相应的三丁基锡烷。
三苯基膦)钯(0)的存在下,用双(三丁基锡)将这些芳基卤化物转化为相应的三丁基锡烷,然后用
在氯胺-T 的存在下,用(123I)碘化钠处理锡烷,得到所需的 123I 标记。
得到所需的 123I 标记的类似物
咪唑苯并二氮杂卓受体配体氟马西尼和溴他西尼。