2.07 g |
With copper(l) iodide; sodium hydrogencarbonate; In dimethyl sulfoxide; at 110℃; for 48h;Inert atmosphere; |
Under nitrogen atmosphere, 6-cyclopropyl-8-fluoro-3,4-dihydroisoquinolin-1(2H)-one (1.56g, 7.6 mmol), 1,6-<strong>[61563-26-6]dibromobenzaldehyde</strong> (4.0g, 15.2 mmol), copper (I) iodide (1.45g, 7.6 mmol) and sodium hydrogen carbonate (1.28 g, 15.2 mmol) were suspended in DMSO (15 mL), then stirred at 110 C for 2 days. Cooled to ambient temperature, water and ethyl acetate were added. Filtered through Celite pad to remove insoluble material, then the filtrate was extracted with ethyl acetate for 3 times. The combined organic layer was washed with brine, dried over sodium sulfate, filtered and concentrated. The crude material was purified by chromatography on silica gel, eluted with chloroform only followed by hexane/ethyl acetate to afford 2-bromo-6-(6-cyclopropyl-8-fluoro-1-oxo-3,4-dihydroisoquino lin-1(2H)-yl)benzaldehyde (2.07 g). 1H NMR (400 MHz, CDCl3) delta 10.21 (s, 1H), 7.58 (dd, J = 8.1, 1.1 Hz, 1H), 7.42 (t, J = 8.0 Hz, 1H), 7.31 - 7.22 (m, 1H), 6.73 (d, J = 1.6 Hz, 1H), 6.68 (dd, J = 12.3, 1.7 Hz, 1H), 4.05 - 3.75 (m, 2H), 3.55 - 2.80 (m, 2H), 1.93 - 1.85 (m, 1H), 1.12 - 1.02 (m, 2H), 0.81 - 0.73 (m, 2H); LCMS (m/z): 387.9 / 389.9 [M+H]+. |