Synthesis and biodistribution of novel<sup>99m</sup>Tc-nitrido methylpiperidine dithioformate derivatives as potential brain imaging agents
作者:Jie Lu、Mingyan Xu、Hongmei Jia、Shuxia Xi、Yimeng Wang、Xuebin Wang
DOI:10.1002/jlcr.1587
日期:2009.5.30
Three dithioformate ligands with methyl substituted on the piperidine rings, potassium 1-(2-methylpiperidine-1-yl)-dithioformate (2-mp), potassium 1-(3-methylpiperidine-1-yl)-dithioformate (3-mp) and potassium 1-(4-methylpiperidine-1-yl)-dithioformate (4-mp) were synthesized. The corresponding 99mTc-nitrido complexes were prepared in high yield (>95%) through the [99mTcN] intermediate and characterized by thin layer chromatography and high-performance liquid chromatography. All the neutral 99mTc-nitrido complexes were stable under physiological conditions and lipophilic with log P values between 1.40 and 1.58. In vivo biodistribution results showed that all the 99mTc-nitrido complexes displayed high brain uptakes and long retention times. Among them, 99mTcN-4mp, demonstrated the best properties for brain imaging with the brain uptake 3.40±0.24, 3.22±0.31, 2.72±0.28 and 2.22±0.18% ID/g at 5, 30, 60 and 120 min p.i., respectively. Moreover, the influence of stereochemistry of the 99mTcN complexes with methyl substitution on ortho, meta and para positions on piperidine ring on the biodistribution properties were investigated with B3LYP/6-31G*(LANL2DZ for Tc) method using the Gaussian 03 program package. Copyright © 2009 John Wiley & Sons, Ltd.
合成了三种哌啶环上被甲基取代的二硫代甲酸配体,即 1-(2-甲基哌啶-1-基)-二硫代甲酸钾(2-mp)、1-(3-甲基哌啶-1-基)-二硫代甲酸钾(3-mp)和 1-(4-甲基哌啶-1-基)-二硫代甲酸钾(4-mp)。通过[99mTcN]中间体以高收率(>95%)制备了相应的 99mTc 硝基配合物,并通过薄层色谱法和高效液相色谱法对其进行了表征。所有中性 99mTc 硝基络合物在生理条件下都很稳定,具有亲脂性,log P 值介于 1.40 和 1.58 之间。体内生物分布结果表明,所有 99mTc 硝基络合物的脑摄取量都很高,且保留时间较长。其中,99m锝-N-4mp表现出最佳的脑成像特性,在5、30、60和120分钟p.i.的脑摄取率分别为3.40±0.24、3.22±0.31、2.72±0.28和2.22±0.18% ID/g。此外,利用高斯 03 程序包,采用 B3LYP/6-31G*(LANL2DZ for Tc) 方法研究了哌啶环上正位、偏位和对位甲基取代的 99mTcN 复合物的立体化学性质对生物分布特性的影响。Copyright © 2009 John Wiley & Sons, Ltd. All Rights Reserved.