(2R,5S)-2-<2-(diethoxyphosphoryl)ethyl>-2,5-dihydro-5-isopropyl-3,6-dimethoxypyrazine   、                                                                                      
3-溴丙炔                                                                                                                                                              在
                                                                                                                                                                                 
叔丁基锂                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 
(2R,5S)-2-<2-(diethoxyphosphoryl)ethyl>-2,5-dihydro-5-isopropyl-3,6-dimethoxy-2-(2-propinyl)pyrazine   、                                                                                             (2R,5S)-2-<2-(diethoxyphosphoryl)ethyl>-2,5-dihydro-5-isopropyl-3,6-dimethoxy-2-(2-propinyl)pyrazine