Water → 6-Bromo-3,4-dihydroquinolin-2(1H)-one

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To a solution of 3,4-dihydro-1H-quinolin-2-one (10.0 g, 67.9 mmol) in 100 ml dry DMF was added dropwise a solution of N-bromosuccinimide (12.7 g, 71.3 mmol) in 150 ml dry DMF at 0° C. The mixture was stirred at 0° C. for 2 h, then 400 ml water was added and the solution was extracted with ethyl acetate (3×150 ml). The organic phase was washed with water (2×200 ml), then dried over MgSO4 and evaporated, affording a yellow solid which was purified by washing with cold ether providing pure 6-bromo-3,4-dihydro-1H-quinolin-2-one (13.6 g, 60.3 mmol, 89%) as colorless needles.

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