反应详情

温度

60 °C

To a solution of tert-butyl 4-(5-bromo-4-hydroxypyrimidin-2-yl)piperazine-1-carboxylate (20 g, 56 mmol) and Pd(Amphos)Cl2 (4.0 g 5.6 mmol) in THF (200 mL, dry) was added benzylzinc(II) bromide (168 mL, 168 mmol) under argon and the mixture was stirred at 60° C. overnight. The reaction mixture was diluted with ethyl acetate (1.5 L), filtered and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel chromatography (petroleum ether/ethyl acetate=1:1 to 100% ethyl acetate) to give 5-benzyl-2-(piperazin-1-yl)pyrimidin-4-ol (8.2 g, 54%) as a pale yellow solid. MS (ES+) C15H18N4O requires: 270, found: 271 [M+H]+.

1. filtrationfiltered
2. concentrationthe filtrate was concentrated under reduced pressure
3. customThe residue was purified by silica gel chromatography (petroleum ether/ethyl acetate=1:1 to 100% ethyl acetate)