1-(2-methyl-5-nitro-phenyl)-piperidine-2,4-dione 在
crude product 、 silica gel 、
3-dimethylaminomethylene-1-(2-methyl-5-nitro-phenyl)-piperidine-2,4-dione 作用下,
以
N,N-二甲基甲酰胺二甲基缩醛 为溶剂,
反应 3.0h,
以to obtain pure desired product i.e., 3-Dimethylaminomethylene-1-(2-methyl-5-nitro-phenyl)-piperidine-2,4-dione [9] as dark red solid [Yield: 79.02 mg, 65.02%]的产率得到3-dimethylaminomethylene-1-(2-methyl-5-nitro-phenyl)-piperidine-2,4-dione