Trifluoromethanesulfonic acid → HCID 71252092, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of (4-bromophenyl) [4-(3,5-dimethylpyridin-2-yl)piperazin-1-yl]methanone (150 mg) described in Preparation Example 165, 3-(4-methoxybenzyl)-5,5-dimethylimidazolidine-2,4-dione (119 mg) described in Preparation Example 53, cesium carbonate (260 mg) and copper(I) iodide (38 mg) were added toluene (8 mL) and N,N′-dimethylethylenediamine (43 μL), and the mixture was stirred with heating under reflux for 29 hr. The reaction mixture was cooled, water was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over sodium sulfate, and the solvent was evaporated. The obtained residue was purified by column chromatography (hexane:ethyl acetate) to give 1-{4-[4-(3,5-dimethylpyridin-2-yl)piperazine-1-carbonyl]phenyl}-3-(4-methoxybenzyl)-5,5-dimethylimidazolidine-2,4-dione. The obtained 1-{4-[4-(3,5-dimethylpyridin-2-yl)piperazine-1-carbonyl]phenyl}-3-(4-methoxybenzyl)-5,5-dimethylimidazolidine-2,4-dione was dissolved in 1,2-dichloroethane (4 mL), trifluoromethanesulfonic acid (92 μL) was added and the mixture was stirred at 80° C. for 13 hr. To the reaction mixture was added 5% aqueous sodium hydrogen carbonate solution, and the mixture was extracted with chloroform/methanol (10:1). The organic layer was dried over sodium sulfate, and the solvent was evaporated. The obtained residue was purified by silica gel column chromatography (ethyl acetate:methanol) to give the title compound (34 mg).

Provenance & Evidence