Ethyl Acetate → (+)-Methyl 5-(3-(hydroxymethyl)phenyl)-8-dimethylcarbamyl-4,6-dithiaoctanoate

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To a solution of (-)-methyl 5-(3-(t-butyldiphenylsilyloxymethyl)phenyl)-8-dimethylcarbamyl-4,6-dithiaoctanoate (step 5) (1.377 g, 2.26 mmol.) in THF (25 mL ) a t room temperature was slowly added tetra-n-butyl ammonium fluoride (1M) in THF (2.34 mL). The solution was stirred 2 hrs at room temperature Ethyl acetate was added to the reaction mixture, and the organic layer it was washed with brine (3×), dried over sodium sulfate, filtered and evaporated to dryness. Purification by flash chromatography using 40% acetone in hexane afforded the title compound.

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