Cesium carbonate → 6-Chloro-2-{3-[4-(4-chloro-phenyl)-piperazin-1-yl]-phenyl}-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-8-carboxylic acid methyl ester

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Reaction Conditions

Reaction Steps

To a mixture of 2-(3-bromo-phenyl)-6-chloro-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-8-carboxylic acid methyl ester (410 mg, 1 mmol), palladium acetate (6.73 mg, 0.03 mmol), cesium carbonate (0.65 g, 2 mmol), xantphos (23 mg, 0.04 mmol) and 1-(4-chloro-phenyl)piperazine hydrochloride (350 mg, 1.5 mmol) in toluene (10 mL) was stirred at 120° C. for 12 hours. Then the reaction mixture was concentrated in vacuo and the residue was extracted with ethyl acetate (2×100 mL), washed with saturated aqueous sodium chloride (2×50 mL), dried over anhydrous sodium sulfate and concentrated in vacuo. Purification on flash silica gel chromatography (silica gel from QingDao, 200-300 mesh, glass column from Shanghai SD company) (20% ethyl acetate/hexanes) to afford 6-chloro-2-{3-[4-(4-chloro-phenyl)-piperazin-1-yl]-phenyl}-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-8-carboxylic acid methyl ester (0.13 g, 25%) as a white solid: LC/MS m/e calcd for C29H31C12N3O2 M+: 524.5, observed: 524.0.

Provenance & Evidence