2-methyl-4-oxo-4H-chromen-8-carbaldehyde   、                                                                                      
乙酰丙酮   、                                                                                      
(3S)-1-benzyl-2,5-dioxopyrrolidin-3-yl (2E)-3-aminobut-2-enoate                                                                                                                                                                                              以
                                                                                         
异丙醇                                                                                  为溶剂,
                                                                                                                                                    反应 16.0h,
                                                                                                                以950 mg (33% of theory) of the desired product are obtained as 4R/4S diastereomer mixture的产率得到(3S)-1-benzyl-2,5-dioxopyrrolidin-3-yl (4R)-5-acetyl-2,6-dimethyl-4-(2-methyl-4-oxo-4H-chromen-8-yl)-1,4-dihydropyridine-3-carboxylate