申请人:Satyamurthy Nagichettiar
公开号:US20120123120A1
公开(公告)日:2012-05-17
Phenyliodonium ylide derivatives substituted with electron donating as well as electron withdrawing groups on the aromatic ring are shown for use as precursors in aromatic nucleophilic substitution reactions. The iodonium ylide group is substituted by nucleophiles such as halide ions to provide the corresponding haloaryl derivatives. No-carrier-added [F-18]fluoride ion exclusively substitutes the iodonium ylide moiety in these derivatives and provides high specific activity F-18 labeled fluoro derivatives. Protected L-dopa-6-iodonium ylide derivative have been synthesized as a precursors for the preparation of no-carrier-added 6-[F-18]fluoro-L-dopa. The iodonium ylide group in this L-dopa.derivative is nucleophilically substituted by no-carrier-added [F-18]fluoride ion to provide a [F-18]fluoro intermediates which upon acid hydrolysis yielded 6-[F-18]fluoro-L-dopa.
苯基碘鎓亚胺衍生物在芳香环上取代电子给体和电子受体基团,可用作芳香亲核取代反应的前体。碘鎓亚胺基团被卤化物等亲核试剂取代,以提供相应的卤代芳基衍生物。无载体添加的[F-18]氟离子仅取代这些衍生物中的碘鎓亚胺基团,并提供高比活度的F-18标记的氟衍生物。保护的L-多巴-6-碘鎓亚胺衍生物已合成为制备无载体添加的6-[F-18]氟-L-多巴的前体。在这个L-多巴衍生物中,碘鎓亚胺基团被无载体添加的[F-18]氟离子亲核取代,以提供一个[F-18]氟中间体,经过酸水解后产生6-[F-18]氟-L-多巴。