2-Aminopyrimidine → N-(4-chloro-2-pyridinyl)pyrimidin-2-amine

참여 물질

반응 조건

반응 단계

Palladium(II) acetate (0.061 g, 0.27 mmol) was added to 2,4-dichloropyridine (0.500 g, 3.38 mmol), 2-Aminopyrimidine (0.321 g, 3.38 mmol), 9,9-Dimethyl-4,5-bis(diphenylphosphino)xanthene (0.235 g, 0.41 mmol) and Cesium carbonate (2.202 g, 6.76 mmol) in dioxane (15 mL) at 20ºC under nitrogen. The resulting suspension was stirred at 100 °C for 90 minutes. Complete reaction by LCMS, cooled to room temperature. The reaction mixture was then filtered, washed with DCM and filtrate concentrated _in vacuo_ to give a yellow gum. This was then dissolved in DCM (200 mL), washed with water (200 mL) and brine (200 mL). The organic layer was passed through phase separating cartridge and concentrated under reduced pressure. The crude product was purified by flash silica chromatography, elution gradient 0 to 50% EtOAc in isohexane. Pure fractions were evaporated to dryness to afford N-(4-chloropyridin-2-yl)pyrimidin-2-amine (0.361 g, 51.7 %) as an off-white solid.

출처 및 근거