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To a solution of 5-(3-acetyl-5-chloro-2-methoxy-6-methylphenyl)-1,3-oxazolidin-2-one (21 mg, 0.072 mmol) (single enantiomer from step 1) in methanol (1 mL) was added sodium tetrahydroborate (5.5 mg, 0.14 mmol) at 0° C. The mixture was stirred at 0° C. for 1 hour. It was diluted with methanol and purified on preparative LCMS using pH 10 buffer to give the desired compound as a racemic mixture of two diastereomers, 17 mg, 83%. LCMS calculated for C13H15ClNO3 (M-OH)+: m/z=268.1; found: 268.1.

1. custompurified on preparative LCMS