Two positron-emitting analogues of tyrosine, O-[11C]methyl-L-tyrosine and O-[18F]fluoromethyl-L-tyrosine were prepared as new tumor imaging agents. The alkylating agent, [11C]methyl triflate or [18F]fluoromethyl triflate, was simply bubbled through a dimethylsulfoxide solution of L-tyrosine disodium salt at room temperature. After subsequent HPLC purification the labeled L-tyrosine analogues were obtained in decay-corrected radiochemical yields of over 50%, based on their corresponding labeling agent, with radiochemical purities always higher than 98%. The quite straightforward preparation, together with the high radiochemical yields achieved, make both these syntheses suitable for routine production. Copyright © 2003 John Wiley & Sons, Ltd.
我们制备了两种可发射正电子的
酪氨酸类似物--O-[11C]甲基-
L-酪氨酸和 O-[18F]
氟甲基-
L-酪氨酸,作为新型肿瘤成像剂。只需在室温下将烷化剂--[11C]三
氟甲基或[18F]
氟甲基三
氟甲基--气泡通过
L-酪氨酸二钠盐的
二甲基亚砜溶液。经过随后的高效
液相色谱纯化后,根据相应的标记剂,标记的 L-
酪氨酸类似物的衰变校正放射
化学收率超过 50%,放射
化学纯度始终高于 98%。这两种合成方法的制备非常简单,而且放射
化学收率高,因此适合常规生产。Copyright © 2003 John Wiley & Sons, Ltd. All Rights Reserved.