Hydrochloric Acid → Methyl 2,4-dimethyl-3-[[2-methyl-5-(4-oxo-1-piperidyl)benzoyl]amino]benzoate

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Reaction Steps

To a solution of methyl 3-[[5-(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)-2-methyl-benzoyl]amino]-2,4-dimethyl-benzoate (250 mg, 570.09 moles) in THF (2 ml) is added 4M HCl (1 ml) and stirred at ambient temperature. The mixture is concentrated under reduced pressure and re-dissolved in acetone (5 ml) followed by the addition of 5N HCl (1 ml). After 22 hours at 60° C., the mixture is cooled to ambient temperature and diluted with 2M NaOH to pH 6 and extracted twice with ethyl acetate. The combined organic layers are dried over sodium sulfate, filtered, and concentrated under reduced pressure. The resulting residue is purified by flash chromatography (silica gel) using 0-50% ethyl acetate in hexane to afford the title compound as an off-white foam (0.12 g, 53.36%). Mass spectrum (m/z): 395.2 (M+1).

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