作者:Chao Li、Xiao-Yong Xu、Xuan-Qi Liu、Qiu-Guo Fu、Wei Wang、Qing-Fu Ye、Zhong Li
DOI:10.1002/jlcr.2949
日期:2012.7
To support the metabolism and toxicology study of cis-neonicotinoids, radio or stable isotope was introduced into different sites of the key intermediate 2-chloro-5-((2-(nitromethylene)imidazolidin-1-yl)methyl)pyridine (6-Cl-PMNI). [3H2]- and [14C]-label were successively prepared from initial materials NaB3H4 and [14C]-nitromethane, respectively. Similarly, [D2]-6-Cl-PMNI was prepared from NaBD4 in four steps, with 52.6% overall isotopic yield, and dual-labeled [D2, 13C]-target was obtained from NaBD4 and [13C]-nitromethane, affording overall isotopic yield of 42.5%. Moreover, [14C2] was introduced from [U-14C]-ethylenediamine dihydrochloride in three steps, with a 58.3% overall chemical yield. Finally, typical labeled cis-neonicotinoids paichongding and cycloxaprid were prepared and characterized. The methods were proved to have good generality in the synthesis of other cis-neonicotinoids, and all results would be useful in metabolism studies of new cis-neonicotinoids. Copyright © 2012 John Wiley & Sons, Ltd.
为了支持顺式新烟碱类化合物的代谢和毒理学研究,在关键中间体 2-氯-5-[(2-(硝基亚甲基)咪唑烷-1-基)甲基]吡啶(6-Cl-PMNI)的不同位点引入了放射性或稳定同位素。[3H2]-标记物和[14C]-标记物分别从初始材料 NaB3H4 和[14C]-硝基甲烷中先后制备出来。同样,从 NaBD4 分四步制备出了[D2]-6-Cl-PMNI,总同位素收率为 52.6%;从 NaBD4 和[13C]-硝基甲烷中得到了双标记的[D2, 13C]-目标物,总同位素收率为 42.5%。此外,通过三个步骤从[U-14C]-乙二胺二盐酸盐中引入了[14C2],总体化学收率为 58.3%。最后,制备并表征了典型的标记顺式新烟碱类化合物派雄丁和环草胺。这些方法被证明在合成其他顺式新烟碱类化合物时具有良好的通用性,所有结果都将有助于新的顺式新烟碱类化合物的代谢研究。Copyright © 2012 John Wiley & Sons, Ltd. All Rights Reserved.