Piperidine → HCID 178480510, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-[(1H-benzimidazol-2-yl)(1-methylpiperidin-4-yloxy)methyl]-benzaldehyde (example 505C, 200 mg) in a mixture of ethanol-water (8:2) (3 mL) is added thiohydantoin (70 mg) and piperidine (57 μL). The reaction mixture is heated at 55° C. for 5 h. Ethanol is removed under reduced pressure. Water is added and the reaction mixture is extracted by ethyl acetate. The organic phase is washed by water, then dried over magnesium sulfate and concentrated. The residue is purified by chromatography on silica gel (gradient dichloromethane/methanol from 95/5 to 90/10). The residue is dissolved in methanol (6 mL) and 30% solution of aqueous ammonia (1.1 mL) and tert-butylhydroperoxide (90 μL) are added. The reaction mixture is stirred at room temperature for two days. The reaction mixture is evaporated to dryness. The residue is purified by chromatography on silica gel (gradient dichloromethane/methanol/ammonia from 90/10/0.1 to 70/30/0.1) to give 5-{3-[(1H-benzimidazol-2-yl)(1-methylpiperidin-4-yloxy)methyl]benzylidene}-2-iminoimidazolidin-4-one. MS, [M+H]+=431.1; [M+Na]+=453.1

Provenance & Evidence