Hydrochloric Acid → Ethyl 3-(4-methylphenyl)-3-oxopropanoate

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Reaction Steps

Ethyl acetoacetate (51.25 g, 390 mmol) was added dropwise to the stirred suspension of anhydrous magnesium chloride (37.54 g, 390 mmol) in dried dichloromethane (200 ml) over a period of 1 hour under argon atmosphere at 0° C. followed by pyridine (62.5 g, 788 mmol). After 15 minutes, 4-chlorobenzoylchloride (68.95 g, 394 mmol) was added dropwise and stirring was continued for 15 minutes at 0° C. and further stirred for 1.5 hours at 30° C. The resulting reaction mixture was neutralized with hydrochloric acid (6N, 235 ml) at 0–5° C., filtered and washed with water. The filtrate was extracted with diethylether (3×100 ml). The ether extract was washed with water, dried over anhydrous sodium sulphate and concentrated to dryness in vacuum. The obtained oil was taken in ammonium chloride (21 g in 200 ml water) solution containing ammonia (2 ml) and stirred at 30° C. for 20 minutes. The resulting solution was extracted with ethyl acetate (3×200 ml). Ethyl acetate extract was dried over anhydrous sodium sulphate, concentrated to yield the crude product, which was purified by column chromatography to yield the title compound as viscous oil (43 g, 48.2%). 1H-NMR (DMSO-d6): δ 1.15–1.18 (t, 3H), 4.08–4.13 (q, 2H), 4.20 (s, 2H), 7.61–7.64 (d, 2H), 7.94–7.97 (d, 2H). MS m/z: 227.1 (M+). Preparation 3 Synthesis of ethyl(4-methylthio)benzoylacetate

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