6-fluoro-2-methyl-4-oxo-4H-chromene-8-carbaldehyde   、                                                                                      
乙酰乙酸乙酯                                                                                                                                                              在
                                                                                                                                                                                 Ethyl 2-[(6-fluoro-2-methyl-4-oxo-4H-chromen-8-yl)methylene]-3-oxobutanoate                                                                                                                                  作用下,
                                                                                                                                                                                                                            以3.30 g (98% of theory) of the title compound are obtained as an E/Z isomer mixture的产率得到Ethyl 2-[(6-fluoro-2-methyl-4-oxo-4H-chromen-8-yl)methylene]-3-oxobutanoate