5-(4-chlorobenzoyl)-1, 2-dihydro-1-pyrrolizinone   、                                                                                      
聚合甲醛   、                                                                                      
dimethylammonium chloride                                                                                                                                                              在
                                                                                                                                                                                 
乙醇                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                    反应 10.0h,
                                                                                                                以13.8 g of (4) was obtained as a white powder, mp 182°-183° C., yield 84%的产率得到5-(4-chlorobenzoyl)-2-dimethylaminomethyl-1, 2-dihydro-1-pyrrolizinone