Dimethyl Sulfoxide → 8-(6-chlorohexyloxy)-4-(3,5-dimethylpyridin-4-ylamino)-7-methoxyquinolin-2(1H)-one

Participants

Reaction Steps

A mixture of 4-(3,5-dimethylpyridin-4-ylamino)-8-hydroxy-7-methoxyquinolin-2(1H)-one (1.46 g, 4.7 mmol), cesium carbonate (1.83 g, 5.6 mmol), and DMSO (15 mL) was stirred at room temperature for 15min, and then 1-bromo-6-chlorohexane (0.83 mL, 5.6 mmol) was added. After 45 min, the reaction was diluted with ethyl acetate, washed with water (×3), dried, filtered, concentrated, and then triturated with hexane/diethyl ether to remove the excess 1-bromo-6-chlorohexane. The solid residue was purified by silica gel chromatography (49:1→23:2; dichloromethane/methanol) to give 8-(6-chlorohexyloxy)-4-(3,5-dimethylpyridin-4-ylamino)-7-methoxyquinolin-2(1H)-one. 1H NMR (400 MHz, CDCl3): δ 8.59 (s, 1H), 8.38 (s, 2H), 7.42 (d, 1H), 6.90 (d, 1H), 6.05 (s, 1H), 5.13 (d, 1H), 4.12 (t, 2H), 3.97 (s, 3H), 3.56 (t, 2H), 2.21 (s, 6H), 1.82 (m, 4H), 1.52 (m, 4H); MS (ESI): 430.3.

Provenance & Evidence