To a stirred solution of 3-bromo-4-methoxy-6-trifluoromethyl-pyridazine (D6) (0.79 g, 3.07 mmol), 4-amino-piperidine-1-carboxylic acid tert-butyl ester (0.74 g, 3.69 mmol) and cesium carbonate (2.0 g, 6.14 mmol) in toluene (15 ml) in a sealed tube under nitrogen, were added (R)-(+)-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (0.29 g, 0.46 mmol) and palladium(II) acetate (0.034 g, 0.15 mmol). The reactiom mixture was stirred at 110° C. for 18 h. After cooling to room temperature, the reaction mixture was filtered though Celite and the filtrate was evaporated. The crude product was purified by flash column chromatography (silica gel; 3% ammonia in methanol (7M)/dichloromethane). The desired fractions were collected and evaporated in vacuo. to yield D7 (0.73 g, 63%) as a yellow solid. C16H23F3N4O3 requires 376; Found 377 (MH+).
