9-methoxy-4-oxo-6,7-dihydro-4H-pyrimido[2,1-a]isoquinoline-3-carboxylic acid ethyl ester                                                                                                                                                              在
                                                                                                                                         
钯                                                                                                                                                                                                                               乙醇                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
4-异丙基甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 7.0h,
                                                                                                                以to give flocculent colorless needles of ethyl 9-methoxy-4-oxo-4H-pyrimido[2,1-a]isoquinoline-3-carboxylate的产率得到9-methoxy-4-oxo-4
H-pyrimido[2,1-
a]isoquinoline-3-carboxylic acid ethyl ester