The reaction of acetylenic amines 1 with electrochemically generated tetraethylammonium carbonate (TEAC) or chemically generated tetraethylammonium hydrogen carbonate (TEAHC) is reported. Unsubstituted or substituted 5-methylene-1,3-oxazolidin-2-ones 2 are obtained in moderate to very high yields according to the reaction conditions adopted and to the nature of the substrate.
The base-promoted cyclization of internal N-propargyl-malonamides in the presence of carbonate bases at room temperature or at 80 °C affords highly substituted 3-pyrrolin-2-ones in good yields.
在碳酸盐碱存在下,在室温或 80 °C 下,碱促进的内部 N-炔丙基-丙二酰胺环化以良好的收率提供了高度取代的 3-吡咯啉-2-酮。