Diethyl Malonate → Ethyl 6-chloro-2-oxo-4-phenyl-1,2-dihydro-3-quinolinecarboxylate

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To a mixture of (2-amino-5-chloro-phenyl)-phenyl-methanone (5 g, 21.58 mmol) and malonic acid diethyl ester (4.565 ml, 30.21 mmol) was added DBU (0.45 ml, 3.02 mmol) under nitrogen and the mixture was stirred at 180-190° C. for 16 h. After cooling, the crude residue was purified by flash column chromatography (100-200 mesh silica, eluting with 50% ethyl acetate in hexane) to afford pure 6-chloro-2-oxo-4-phenyl-1,2-dihydro-quinoline-3-carboxylic acid ethyl ester (3.5 g, 49%) as off white solid. LC-MS: 328 (M+H)+.

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