A vial was charged with 6-bromo-2-isoquinolin-3-yl-chromen-4-one O-tert-butyl oxime (100 mg, 0.236 mmol), Pd-PEPPSI® (3 mg, 0.005 mmol), potassium tert-butoxide (40 mg, 0.354 mmol) and purged with argon for 15 min. Pyrrolidine (24 μl, 0.283 mmol) and dry 1,2-dimethoxyethane (1 ml) were added and the solution was heated at 80° C. for 18 hours. The mixture was diluted with ethyl acetate washed with a saturated aqueous solution of ammonium chloride, water and brine, dried over sodium sulfate and purified by flash chromatography over silica gel (cyclohexane/dichloromethane: 0-80%) to yield 2-isoquinolin-3-yl-6-(pyrrolidin-1-yl)-chromen-4-one O-tert-butyl oxime (64 mg, 65%).
