Reaktion #845
ord-8b2355aecdcf48e08035fb224a453205
Reaktionsgleichung
Lösungsmittel
Reaktionsbedingungen
Vorschrift
A mixture of 5-chloroquinolin-8-yl trifluoromethanesulfonate (1.8 g, 5.78 mmol), Cesium carbonate (2.63 g, 8.09 mmol), rac-2,2'-Bis(diphenylphosphino)-1,1'-binaphthyl (0.180 g, 0.29 mmol), tert- Butyl 1-piperazinecarboxylate (1.291 g, 6.93 mmol) and Palladium(II) acetate (0.065 g, 0.29 mmol) in THF (30 mL) under a nitrogen atmosphere was stirred at 75 °C for 6h. The solution was cooled to rt and diluted with ether. The mixtture was filtered through celite and the solvent was evaporated under reduced pressure. The residue was purified by flash chromatography on silica gel, eluting with a gradient of 25-50% EtOAc in heptane, to afford tert-butyl 4-(5-chloroquinolin-8-yl)piperazine-1-carboxylate (0.489 g, 24.34 %) as an oil. 1H NMR (400 MHz, CHLOROFORM- _d_ ) d ppm 1.51 (s, 9 H), 3.28 - 3.37 (m, 4 H), 3.72 - 3.82 (m, 4 H), 7.06 (d, _J_ =7.81 Hz, 1 H), 7.48 - 7.57 (m, 2 H), 8.57 (dd, _J_ =8.59, 1.95 Hz, 1 H), 8.94 (dd, _J_ =4.10, 1.76 Hz, 1 H); MS m/z 348.31 [M+H]+ (ESI).