The synthesis of 4-(4-([11C]methoxyphenyl) -(5-fluoro-2-hydro-xyphenyl)-methylene-aminobutyric acid, as a potential radioli-gand for the gaba receptor in the brain
作者:Filip De Vos、Guido Slegers
DOI:10.1002/jlcr.2580340708
日期:1994.7
A procedure for the synthesis of 4-(4-[11C]methoxyphenyl) -(5-fluoro-2-hydroxyphenyl)-methylene-aminobutyric acid has been developed. The production entailed a O-methylation of 5-fluoro-2-hydroxy-4′-hydroxybenzophenone with cyclotron produced [11C]iodomethane in the presence of alkali and a subsequent Schiff reaction of 5-fluoro-2-hydroxy-4′-(11C]methoxybenzophenone with γ-aminobutyric acid. 5-Fluoro-2-hydroxy-4′-hydroxybenzophenone was obtained by a demethylation of the 4′-methoxyderivative with boron tribromide. Subsequent purification by HPLC and sterilisation by filtration gave 740 MBq (20 mCi) of an injectable solution. The radiochemical yield (decaycorrected) from [11C]iodomethane achieved 27%. The specific activity was 3.7 GBq/μmol (100 mCi/μmol) at the end of the radiosynthesis (45 min from EOB). The preparations have been demonstrated to be chemically and radiochemically pure by HPLC and TLC.
已开发出一种合成4-(4-[11C]甲氧基苯基)-(5-氟-2-羟苯基)-甲亚胺基丁酸的方法。该生产过程包括在碱性条件下,用回旋加速器生产的[11C]碘甲烷对5-氟-2-羟基-4′-羟基二苯酮进行O-甲基化,随后与γ-氨基丁酸进行希夫反应。5-氟-2-羟基-4′-羟基二苯酮是通过用三溴化硼对4′-甲氧基衍生物进行脱甲基化得到的。随后通过HPLC纯化和过滤灭菌得到740 MBq(20 mCi)的可注射溶液。从[11C]碘甲烷获得的放射化学产率(衰变校正)为27%。在放射合成结束时(自EOB起45分钟),比活性为3.7 GBq/μmol(100 mCi/μmol)。通过HPLC和TLC证实制备物在化学和放射化学上是纯的。