Ethyl 4-bromobutyrate → HCID 67142904, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-((R)-2-amino-2-phenyl-ethyl)-1-(2-fluoro-6-trifluoromethyl-benzyl)-6-methyl-5-[4-(3-nitro-benzyl)-piperazin-1-yl]-1H-pyrimidine-2,4-dione (3-58) (55 mg, 0.086 mmol) in acetonitrile (2 mL) were added N,N-diisopropylethylamine (37 μl, 0.271 mmol) and 4-bromo-butyric acid ethyl ester (15 μl, 0.086 mmol) in the order, followed by stirring at 95° C. for 12 hrs. The solution was cooled to room temperature, diluted with dichloromethane and washed with an aqueous saturated sodium bicarbonate solution. The organic layer thus formed was separated and concentrated. The residue was purified using silica gel chromatography (eluent: dichloromethane/methanol, 30/1) and dried in a vacuum to afford 21 mg of the compound as a colorless oil (yield 33%). 1H NMR (300 MHz, CDCl3) δ 1.19 (3H, t), 1.65 (2H, m), 2.24 (4H, m), 2.33 (3H, s), 2.37-2.50 (4H, m), 2.74 (2H, m), 3.60 (4H, m), 4.02-4.09 (4H, m), 4.16 (1H, m), 5.40 (2H, dd), 7.20-7.40 (7H, m), 7.49 (1H, t), 7.53 (1H, d), 7.76 (1H, d), 8.10 (1H, dd), 8.18 (1H, s)

Provenance & Evidence