1-(2-methyl-5-nitro-phenyl)-piperidin-4-one 在
crude product 、 silica gel 、
3-dimethylaminomethylene-1-(2-methyl-5-nitro-phenyl)-piperidin-4-one 作用下,
以
N,N-二甲基甲酰胺二甲基缩醛 为溶剂,
反应 12.0h,
以to obtain pure desired product i.e., 3-Dimethylaminomethylene-1-(2-methyl-5-nitro-phenyl)-piperidin-4-one [4] as orange solid [Yield: 76.2 mg, 62.02%]的产率得到3-dimethylaminomethylene-1-(2-methyl-5-nitro-phenyl)-piperidin-4-one