Ring-opening of N-(tert-butoxycarbonyl)aziridine-2-isopropyl carboxylate with no-carrier-added (n.c.a.) [11C]cyanide is reported. Following purification by HPLC, the protected D,L-[4-11C]β-cyanoalanine was subsequently hydrolysed, to yield D,L-[4-11C]asparagine or D,L-[4-11C]aspartic acid, or reduced followed by hydrolysis to give D,L-2,4-diamino[4-11C]butyric acid. Typical syntheses starting with 10 GBq hydrogen [11C]cyanide yielded 1–1.4 GBq of [4-11C]amino acid within 30 min, giving the labelled amino acids in 30–40% decay corrected radiochemical yield (counted from [11C]cyanide) with radiochemical purities of 95%, 98% and 60%, respectively. Copyright © 2001 John Wiley & Sons, Ltd.
据报道,N-(叔丁氧基羰基)
氮丙啶-2-异丙基
羧酸酯与未添加载体的(n.c.a.)[11C]
氰化物进行开环。通过 HPLC 纯化后,受保护的 D,L-[4-11C]β-
氰基丙
氨酸随后被
水解,产生 D,L-[4-11C]天冬酰胺或 D,L-[4-11C]
天冬氨酸,或还原然后
水解得到D,
L-2,4-二
氨基[4-11C]
丁酸。典型的合成从 10 GBq 氢 [11C]
氰化物开始,在 30 分钟内产生 1–1.4 GBq 的 [4-11C]
氨基酸,以 30–40% 衰减校正的放射
化学产率给出标记的
氨基酸(从 [11C]
氰化物计算)放射
化学纯度分别为95%、98%和60%。版权所有 © 2001 约翰·威利父子有限公司