3-bromo-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one acetate   、                                                                                      
3-bromo-2-butyl-4H-pyrido[1,2-a]pyrimidin-4-one   、                                                                                      
4-氯苯硼酸   、                                                                                      
4-甲氧基苯硼酸                                                                                                                                                                                                                                                                                                          以3-(4-chlorophenyl)-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one was obtained (68%) as a colorless solid的产率得到3-(4-chlorophenyl)-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one