Synthesis of the racemate and individual enantiomers of [11C]methylphenidate for studying presynaptic dopaminergic neuron with positron emission tomography
作者:Y.-S. Ding、Y. Sugano、J. S. Fowler、C. Salata
DOI:10.1002/jlcr.2580341012
日期:1994.10
Carbon-11 labeled dl-threo-methylphenidate (methyl-2-phenyl-2-(2-piperidyl)acetate, Ritalin), a psychostimulant drug widely used to treat attention deficit hyperactivity disorder, was prepared in two steps: O-methylation of the N-protected dl-threo-ritalinic acid derivative with [11C]methyl iodide followed by deprotection. The same strategy was applied for the preparation of C-11 labeled individual enantiomers of threo-methylphenidate from N-protected d-threo- or l-threo-ritalinic acid. The subsequent C 18 sep-pak and reverse-phase HPLC purification resulted in ca. 40% radiochemical yield with a total synthesis time of 40 minutes and an average specific activity of 1.5 Ci/μmole (at EOB).
碳-11标记的dl-苏式-甲基苯丙胺(甲基-2-苯基-2-(2-哌啶基)乙酸酯,利他林),一种广泛用于治疗注意力缺陷多动症的精神刺激药物,通过两个步骤制备:用[11C]甲基碘对N-保护的dl-苏式-利他林酸衍生物进行O-甲基化,随后去保护。同样策略应用于从N-保护的d-苏式或l-苏式-利他林酸制备C-11标记的苏式-甲基苯丙胺单独对映体。随后的C 18 萃取树脂和反相HPLC纯化得到约40%的放射化学产率,总合成时间为40分钟,平均比活度为1.5 Ci/μmole(在EOB时)。