11C–C bond formation by palladium-mediated cross-coupling of alkenylzirconocenes with [11C]methyl iodide
作者:Frank R. Wuest、Mathias Berndt
DOI:10.1002/jlcr.1044
日期:2006.2
A novel 11C–C bond formation based on the palladium-mediated cross-coupling reaction of alkenylzirconocenes with [11C]methyl iodide is described. The conversion of internal alkynes into the corresponding alkenylzirconocenes followed by transmetalation with Pd(PPh3)4 and subsequent cross-coupling with [11C]methyl iodide gave several 11C-labelled α,α′-dimethyl-substituted alkenes. The palladium complex
描述了一种基于钯介导的烯基锆茂与 [11C] 甲基碘的交叉偶联反应的新型 11C-C 键形成。内部炔烃转化为相应的烯基锆茂,然后与 Pd(PPh3)4 进行金属转移,随后与 [11C] 甲基碘交叉偶联得到几个 11C 标记的 α,α'-二甲基取代烯烃。钯配合物 Pd(PPh3)4 作为过渡金属配合物被证明优于 Pt(PPh3)4 或 Ni(PPh3)4。用各种内部炔烃测试了新的钯介导的烯基锆茂与 [11C] 甲基碘的交叉偶联反应的范围和局限性。在 60°C 下加热 6 分钟后,可实现高达 75%(基于 [11C] 甲基碘)的放射化学产率。版权所有 © 2006 John Wiley & Sons, Ltd.