反应详情

温度

110 °C

To a glass vial was added 4-methoxy-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidine (0.273 g, 1.65 mmol), 3-bromo-5-(trifluoromethyl)pyridine (0.373 g, 1.65 mmol), cesium carbonate (1.08 g, 3.31 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.076 g, 0.083 mmol), X-Phos (0.079 g, 0.165 mmol) and anhydrous dioxane (5 mL). The vial was flushed with a stream of argon for 15 sec and capped. The mixture was heated with stirring for 1.5 h at 110° C. Filtered through a celite pad, concentrated in vacuo and purified by flash chromatography on silica gel with heptanes/EtOAc, 100/0 to 0/100 to give 4-methoxy-6-(5-trifluoromethyl-pyridin-3-yl)-5,6,7,8-tetrahydro-pyrido[4,3-d]pyrimidine as an orange gum (195 mg, 34% yield) 1H NMR (DMSO-d6, 298K) 2.95 (t, 2H) 3.77 (t, 2H) 4.02 (s, 3H) 4.37 (s, 2H) 7.67-7.71 (m, 1H) 8.30-8.34 (m, 1H) 8.63 (s, 1H) 8.67-8.71 (1H, m) LCMS: [M+H]+=311.2, Rt(4)=0.94 min.

1. customThe vial was flushed with a stream of argon for 15 sec
2. customcapped
3. temperatureThe mixture was heated
4. filtrationFiltered through a celite pad
5. concentrationconcentrated in vacuo
6. custompurified by flash chromatography on silica gel with heptanes/EtOAc, 100/0 to 0/100