Sodium Hydroxide → 4-Bromo-7-chloro-3-(4-chloro-benzenesulfonyl)-quinoline

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Reaction Steps

A mixture of 7-chloro-3-(4-chloro-benzenesulfonyl)-quinolin-4-ol (0.5 g, 1.41 mmol) and phosphorus(V) oxybromide (1.2 g, 4.2 mmol) in chloroform (30 ml) and triethylamine (1 ml) was refluxed for 6 hours. The reaction mixture was diluted with water (30 ml) and the pH was adjusted to 10 with aqueous sodium hydroxide solution. The organic layer was separated, dried over sodium sulfate, filtered, and concentrated in vacuo. The obtained crude product was purified by crystallization from diethyl ether to obtain 0.45 g of the title compound in 77% yield.

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