马来酰亚胺   、                                                                                      
2-[2-(2-methoxyphenyl)vinyl]-1-methyl-1H-pyrrole                                                                                                                                                              在
                                                                                                                                                                                 
乙醚                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                    反应 19.5h,
                                                                                                                以leaving 4-(2-methoxyphenyl)-6-methyl-4,5,6,8b-tetrahydro-3aH-2,6-diaza-as-indacene-1,3-dione as a tan powder (7.63 g, 75%), mp 208-212° C的产率得到4-(2-methoxyphenyl)-6-methyl-4,5,6,8b-tetrahydro-3aH-2,6-diaza-as-indacene-1,3-dione