Synthesis of carbon-14 and stable isotope labelled NN414: a potent potassium channel opener
作者:Steen K. Johansen、Jesper B. Kristensen、Lars K. Müller、Claus U. Jessen、Christian Foged
DOI:10.1002/jlcr.805
日期:2004.2
Currently, NN414, a potent β-cell selective potassium channel opener, is undergoing clinical trials for the treatment of type 2 diabetes. Here, we report the synthesis of carbon-14 and stable isotope labelled NN414 for use in metabolic studies and as an internal standard in pharmacokinetic assays, respectively. The carbon-14 labelling was performed in two steps starting from an advanced intermediate. This provided [14C]NN414 in 60% overall radiochemical yield with a specific activity of 58mCi/mmol. The stable isotope labelling was accomplished from benzyl tert-butyl malonate in eight steps using [13C,2H3]iodomethane and [2H2]dibromomethane as the source of carbon-13/deuterium. The synthetic sequence, which included a Mannich reaction followed by deamination, a Simmons–Smith-type cyclopropanation and a modified Curtius reaction, provided [13C,2H5]NN414 in 8.6% overall yield. Copyright © 2004 John Wiley & Sons, Ltd.
目前,NN414是一种有效的β细胞选择性钾通道开放剂,正在进行治疗2型糖尿病的临床试验。在这里,我们报告了碳 14 和稳定同位素标记的 NN414 的合成,分别用于代谢研究和药代动力学测定中的内标。碳 14 标记从高级中间体开始分两步进行。这提供了总放射化学产率为 60% 且比活性为 58mCi/mmol 的 [14C]NN414。使用[13C,2H3]碘甲烷和[2H2]二溴甲烷作为碳13/氘源,通过八个步骤从丙二酸叔丁基苄酯完成稳定同位素标记。合成序列包括曼尼希反应、随后脱氨、西蒙斯-史密斯型环丙烷化和改进的库尔蒂斯反应,以 8.6% 的总产率提供 [13C,2H5]NN414。版权所有 © 2004 约翰·威利父子有限公司