Imaging by scintigraphy the serotonin transporter (5-HTT) in the living human brain would be of great value in research on the pathophysiology and treatment of neuropsychiatric disorders such as depression. For that reason, and in order to obtain a selective radiotracer applicable to PET, we report here the carbon-11 labelling of a selective 5-HTT radioligand: N, N-dimethyl-2-(2-amino-4-methylphenylthio)benzylamine or MADAM in two different positions: [p-11C-methyl]MADAM and [N-11C-methyl]MADAM. The synthesis of Bu3Sn-ADAM and N-dimethyl-MADAM is described. [p-11C-methyl]MADAM was obtained by a Stille coupling reaction between Bu3Sn-ADAM and [11C]methyl iodide using palladium (0) as a catalyst without (Ia) or with copper chloride as a co-catalyst (Ib). [N-11C-methyl]MADAM was obtained by an N-methylation reaction between N-demethyl-MADAM and [11C]methyl iodide (II). The carbon-11 incorporation yield in [p-11C-methyl]MADAM was 10–30% (Ia and Ib) and in [N-11C-methyl]MADAM was 75-80% (II). The final product in each case was obtained in 30 min total synthesis time, including HPLC purification and with >99% radiochemical purity. Copyright © 2001 John Wiley & Sons, Ltd.
通过闪烁成像对活体人脑中的
血清素转运体(5-H
TT)进行成像,对于研究抑郁症等神经精神疾病的病理生理学和治疗具有重要价值。为此,为了获得一种适用于 PET 的选择性放射性示踪剂,我们在此报告一种选择性 5-H
TT 放射性
配体的碳-11 标记:N,N-二甲基-2-(2-
氨基-4-甲基苯
硫基)
苄胺或
MADAM 在两个不同位置的碳-11 标记:[p-11C-甲基]
MADAM 和 [N-11C- 甲基]
MADAM。本文介绍了 Bu3Sn-A
DAM 和 N-二甲基-
MADAM 的合成。[p-11C-甲基]
MADAM 是通过 Bu3Sn-A
DAM 和[11C]甲基
碘之间的 Stille 偶联反应得到的,该反应不使用
钯 (0) 作为催化剂 (Ia),也可以使用
氯化
铜作为辅助催化剂 (Ib)。[N-11C-methyl]
MADAM 是通过 N-去甲基-
MADAM 和 [11C]methyl iodide(II)的 N-甲基化反应得到的。p-11C-甲基]
MADAM 的碳-11 结合率为 10-30%(Ia 和 Ib),而[N-11C-甲基]
MADAM 的碳-11 结合率为 75-80%(II)。在每种情况下,最终产品的合成时间均为 30 分钟,包括 HPLC 纯化,放射
化学纯度均大于 99%。Copyright © 2001 John Wiley & Sons, Ltd. All Rights Reserved.