4-Methoxyphenylacetic Acid → N-(6-methoxyisoquinolin-3-yl)-2-(4-methoxyphenyl)acetamide

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To a solution of (4-methoxyphenyl)acetic acid (166.2 mg, 0.86 mmol) in 5 ml of anhydrous THF were added oxalyl chloride (126.9 mg, 4.3 mmol) and 100 ul of DMF. A vigorous effervescence occurred. Within 1-4 minutes the effervescence stopped and the mixture was stirred for 30 minutes at room temperature. Then the 6-methoxyisoquinolin-3-amine (150.0 mg, 0.86 mmol) and Et3N (0.86 mmol) were added. The reaction was stirred at the ambient temperature over 16 hours. The reaction was monitored by LC/MS that showed no more start material left. The reaction crude was purified by a silica gel column to give product 75.7 mg (yield 27.3%). 1H NMR (400 MHz, DMSO-d6) ppm 3.68 (s, 2H), 3.72 (s, 3H), 3.89 (s, 3H), 6.89 (d, J=8.81 Hz, 2H), 7.14 (dd, J=8.94, 2.39 Hz, 1H), 7.26 (d, J=2.27 Hz, 1H), 7.30 (d, J=8.81 Hz, 2H), 7.95 (d, J=9.06 Hz, 1H), 8.32 (s, 1H), 8.98 (s, 1H), 10.73 (s, 1H). HRMS: m/z 323.13882 [M+H]+), calc. 323.13902. MS m/z, (APCI); 323.2 ([M+H]+).

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