Syntheses of the phosphodiesterase-4 inhibitors [11C]Ro 20-1724, R-, R/S- and S-[11C]rolipram
作者:Jean N. DaSilva、Celia M. Lourenco、Alan A. Wilson、Sylvain Houle
DOI:10.1002/jlcr.465
日期:2001.4
The high affinity and selective cAMP-specific phosphodiesterase-4 inhibitors Ro 20-1724, R-, R/S- and S-rolipram were labeled with 11C by O-[11C]methylation of their respective phenolic precursors using [11C]methyl iodide. The desmethyl precursor of Ro 20-1724 was prepared by selective dealkylation with iodotrimethylsilane, whereas, dealkylation of racemic rolipram was not selective and yielded several products. Enantiomeric separation of R- and S-desmethylrolipram was carried out by chiral semi-preparative high performance liquid chromatography. The final 11C-labeled products were prepared in high radiochemical purity (>99%), yields (45-75%, decay-corrected) and specific activities [18.5-92.5 GBq/µmol], within 30 min from end-of-bombardment. Copyright © 2001 John Wiley & Sons, Ltd.
利用[11C]甲基碘对各自的酚类前体进行 O-[11C]甲基化,用 11C 标记了高亲和力和选择性 cAMP 特异性磷酸二酯酶-4 抑制剂 Ro 20-1724、R-、R/S- 和 S-罗利普仑。Ro 20-1724 的脱甲基前体是通过碘三甲基硅烷选择性脱烷基制备的,而外消旋罗利普仑的脱烷基反应则没有选择性,会产生多种产物。采用手性半制备高效液相色谱法对 R-和 S-脱甲基罗利普仑的对映体进行了分离。最终制备出的 11C 标记产品具有较高的放射化学纯度(>99%)、收率(45-75%,衰变校正)和比活度[18.5-92.5 GBq/µmol],且均在轰炸结束后 30 分钟内完成。Copyright © 2001 John Wiley & Sons, Ltd. All Rights Reserved.