Identification of unexpected unlabeled <i>N,N</i>
-dimethylamide formation in the synthesis of deuterated fragment of ribociclib by a HATU-mediated coupling reaction
作者:Kuo Gai、Baomin Liu、Yinsheng Zhang
DOI:10.1002/jlcr.3690
日期:2019.2
Starting from N,N-dimethylamine and D2O, deuterated fragment of ribociclib was synthesized for use as a mass spectroscopy internal standard. Furthermore, systematic studies on D0 (unlabeled material) formation during the amidation reaction were performed, leading to the identification of a coupling reagent, HATU (O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate), as main cause. Finally, an alternative route was designed using EDCI/HOBT as coupling reagents to produce the desired deuterated compound without D0 residue.
从 N,N-二甲胺和 D2O 开始,合成了 ribociclib 的氚代片段,用作质谱内标。此外,还对酰胺化反应过程中 D0(未标记物质)的形成进行了系统研究,从而确定了一种偶联试剂 HATU(O-(7-氮杂苯并三唑-1-基)-N,N,N′,N′-四甲基脲六氟磷酸盐)是主要原因。最后,我们设计了一条替代路线,使用 EDCI/HOBT 作为偶联试剂,生成所需的无 D0 残留的氚代化合物。