Cesium carbonate → {1-[4-(Isoquinolin-6-ylamino)-1-(4-methoxy-phenyl)-cyclohexyl]-propyl}-carbamic acid benzyl ester

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In 1 mL of absolute toluene were dissolved 66.0 mg (0.32 mmol) of 6-bromo-isoquinoline, 151 mg (380 μmol) of {1-[4-amino-1-(4-methoxy-phenyl)-cyclohexyl]-propyl}-carbamic acid benzyl ester (98), and 155 mg (476 μmol) of cesium carbonate. The solution was degassed twice, then 2.14 mg (9.5 μmol) of palladium acetate and 8.89 mg (14.3 μmol) of 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl were added and the reaction mixture was heated to 100° C. until complete conversion could be observed. The mixture was evaporated, then redissolved in 50 mL of dichloromethane and washed twice with 50 mL of saturated aqueous sodium bicarbonate solution. The organic phase was dried over magnesium sulphate, filtered, concentrated and purified by silica gel chromatography (dichloromethane:methanol) to give 48 mg of the pure desired product. Rt=1.38 min (Method 19). Detected mass: 524.4 (M+H+).

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