ethyl 3-[4-(2-methylprop-2-enyl)-2,5-dioxo-1-propylimidazolidin-4-yl]propanoate   、                                                                                      alkaline earth salt of/the/ methylsulfuric acid                                                                                                                                                              在
                                                                                                                                                                                 
potassium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
丙酮                                                                                  为溶剂,
                                                                                                                                                                                        以100%的产率得到ethyl 3-[3-allyl-4-(2-methylprop-2-enyl)-2,5-dioxo-1-propylimidazolidin-4-yl]propanoate