Sodium bis(trimethylsilyl)amide → 7-chloro-3-methyl-2-oxazol-2-yl-1-phenyl-1H-quinolin-4-one

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In a 25 mL round-bottomed flask, 1-(4-chloro-2-phenylamino-phenyl)-propan-1-one (522 mg, 2.01 mmol) was combined with THF (4 mL) to give a yellow solution. Sodium bis(trimethylsilyl)amide (1.0 M in THF) (5.02 mL, 5.02 mmol) was added slowly dropwise, resulting in a dark red solution. A mixture of oxazole-2-carbonyl chloride (344 mg, 2.61 mmol) in THF (8 mL) and 8 drops of DMF were added to the reaction mixture. The resulting mixture was stirred at room temperature for 5 hr. The reaction mixture was quenched by the addition of water and the aqueous layer was extracted with ethyl acetate. The organic phase was dried (MgSO4), filtered, then concentrated to afford a yellow oil. The crude material was purified by flash chromatography (silica gel, 80 g, 25-65% ethyl acetate in hexanes) to give 7-chloro-3-methyl-2-oxazol-2-yl-1-phenyl-1H-quinolin-4-one (160 mg, 23.6%) as a yellowish solid. MS calcd. for C19H13ClN2O2 [(M+H)+] 337, obsd. 337.

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