Hydroxyamine hydrochloride → 2-butyl-5-(4-isopropoxyphenyl)-6-methyl-3-{[2'-(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)biphenyl-4-yl]methyl}pyrimidin-4(3H)-one

Participants

Reaction Conditions

Reaction Steps

4′-{[2-Butyl-5-(4-isopropoxyphenyl)-4-methyl-6-oxopyrimidin-1(6H)-yl]methyl}biphenyl-2-carbonitrile (0.56 g) was dissolved in dimethyl sulfoxide (5 mL), and hydroxylamine hydrochloride (0.79 g) and sodium hydrogen carbonate (1.2 g) were added. The mixture was stirred overnight at 90° C. After cooling, the reaction mixture was diluted with ethyl acetate, washed with water, dried over sodium sulfate and concentrated. The residue was dissolved in tetrahydrofuran (5 mL), and N,N′-carbonyldiimidazole (0.28 g) and 1,8-diazabicyclo[5.4.0]undec-7-ene (0.26 mL) were added. After stirring for 30 min, the reaction mixture was diluted with ethyl acetate, washed with 1 M hydrochloric acid, dried over sodium sulfate and concentrated. The residue was purified by silica gel column chromatography to give the title compound as a colorless solid (0.49 g, 78%).

Provenance & Evidence