A simple and efficient synthetic approach to 1,4-disubstituted piperazine-2,5-diones was developed. A series of symmetrical 1,4-disubstituted piperazine-2,5-diones was prepared from chloroacetamides using potassium iodide catalysis in acetone/water. The structures of two products were confirmed by single crystal X-ray diffraction analysis.
研究人员开发了一种简单高效的 1,4-二取代哌嗪-2,5-二酮的合成方法。在丙酮/水中使用碘化钾催化,从氯乙酰胺制备了一系列对称的 1,4-二取代哌嗪-2,5-二酮。通过单晶 X 射线衍射分析证实了两种产品的结构。
A crystallographic and solid-state NMR study of 1,4-disubstituted 2,5-diketopiperazines
作者:Berislav Perić、Natalija Pantalon Juraj、Gábor Szalontai、Suzana R. Veličković、Filip M. Veljković、Dražen Vikić-Topić、Srećko I. Kirin
DOI:10.1016/j.molstruc.2021.130157
日期:2021.6
characterized by NMR in solution and IR spectroscopy. The identity of the compounds was confirmed and their fragmentation analyzed by ESI-MS and HRMS spectrometry. X-ray single crystal structures revealed that the three compounds crystallize in space groups P21 (1), Pbca (2) and P21/c (3), respectively. The solid-statestructures of 1-3 were further analyzed by a combination of solid-stateNMRspectroscopy and