Hydrochloric Acid → (5R)-5-(3,5-difluorophenyl)-2,2-dimethylthiomorpholin-3-one

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To a solution of methyl 2-{[(2R)-2-[(tert-butylsulfinyl)amino]-2-(3,5-difluorophenyl)ethyl]thio}-2-methylpropanoate from Step C (428 mg, 1.09 mmol) in MeOH (20 mL), cooled to 0° C., was added anhydrous HCl gas for 1 minute. The reaction was sealed and allowed to sit at 0° C. for fifteen minutes, after which nitrogen was bubbled through the reaction for twenty minutes. The reaction was concentrated in vacuo. Additional MeOH (30 mL) was added and it was again concentrated in vacuo. This was repeated with another addition of MeOH and triethylamine (440. mg, 4.35 mmol). To the resulting residue was added toluene (10 mL) and triethylamine (440. mg, 4.35 mmol). A reflux condenser was attached and the mixture stirred at 115° C. After one week of stirring, the reaction was judged to be 90% complete by LCMS. The mixture was cooled to ambient temperature and concentrated in vacuo. The residue was diluted with diethyl ether (50 mL) and washed individually with 20 mL of each of the following aqueous solutions: 1 M HCl (twice), water, and saturated brine. The organic layer was then dried over sodium sulfate, filtered, and concentrated in vacuo to give a residue that was purified by silica gel chromatography, eluting with a gradient of MeOH:CH2Cl2—1:99 to 5:95, to give the title compound. MS: m/z=258 (M+1).

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