反应详情

3'-Acetyl-1'-benzyloxymethyl-3-methyl-spiro[1,2,3,4-tetrahydroquinazoline-4,4'-imidazolidine]-2,2',5'trione (3.06 g) is dissolved in dimethylformamide (20 ml) and thereto is added methyl iodide (1 ml) and further added in portions sodium hydride (60%) (0.3 g) under ice-cooling, and the mixture is stirred at room temperature for 30 minutes. To the reaction mixture is added water, and the mixture is extracted with ethyl acetate. The extract is dried and distilled to remove the solvent. The residue is purified by silica gel column chromatography (solvent: chloroform) to give 3'-acetyl-1'-benzyloxymethyl-1,3-dimethyl-spiro[1,2,3,4-tetrahydroquinazoline-4,4'-imidazolidine]-2,2',5'-trione (3 g, yield: 94.5%) as an oily substance.

1. temperaturecooling
2. extractionthe mixture is extracted with ethyl acetate
3. customThe extract is dried
4. distillationdistilled
5. customto remove the solvent
6. customThe residue is purified by silica gel column chromatography (solvent: chloroform)