Sodium Hydroxide → 2-(Isoquinolin-5-YL)acetic acid

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Isoquinolin-5-yl-acetic acid methyl ester (Preparation 6, Step 3; 90 mg, 0.448 mmol) was treated with aqueous sodium hydroxide (4N, 3 mL) and the solution was heated at 50° C. for 4 h. The solution was cooled to 0° C. and acetic acid (2 mL) was added dropwise, which resulted in the formation of a precipitate. The mixture was kept at 0° C. overnight (ca. 15 h) and the precipitate was removed via filtration and was washed with water. The solid was dried in air to afford 35 mg (47% yield) of isoquinolin-5-yl-acetic acid; 1H NMR (400 MHz, CD3OD) δ9.24 (s, 1H), 8.47 (d, J=6.2 Hz, 1H), 8.04 (d, J=7.9 Hz, 1H), 7.96 (d, J=6.2 Hz, 1H), 7.74 (d, J=6.6 Hz, 1H), 7.66 (t, J=7.6 Hz, 1H), 4.11 (s, 2H); MS (AP/Cl): 188.3 (M+H)+.

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