巴比妥酸   、                                                                                      
2-(2,6-dimethyl-morpholin-4-yl)-3,4-difluoro-5-(5-methyl-pyrazin-2-yl)-benzaldehyde                                                                                                                                                              在
                                                                                                                                                                                 
溶剂黄146                                                                                                                                  作用下,
                                                                                                                                                                                        反应 1.0h,
                                                                                                                生成                                                 (2R,4S,4aS)-9,10-difluoro-2,4-dimethyl-8-(5-methylpyrazin-2-yl)-1,2,4,4a-tetrahydro-2'H,6H-spiro[1,4-oxazino[4,3-a]quinoline-5,5'-pyrimidine]-2',4',6'(1'H,3'H)-trione