Hydrochloric Acid → 4-[(2-{(2R)-2-[(1E,3S)-3-hydroxyoct-1-enyl]-5-oxopyrrolidin-1-yl}ethyl)thio]butanoic acid methyl ester

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A solution of methyl 4-[(2-{(5R)-2-oxo-5-[(1E)-3-oxooct-1-enyl]pyrrolidin-1-yl}ethyl)thio]-butanoate (0.039 g, 0.1 mmol) in 2 mL of anhydrous toluene was added dropwise to a −30° C. solution of (R)-2-methyl-CBS-oxazaborolidine (1 M in toluene, 0.05 mL, 0.05 mmol) and borane-methyl sulfide complex (10 M, 0.01 mL, 0.1 mmol). The reaction was stirred for 7 hours at −30° C. and then a solution of hydrochloric acid in methanol (2 M, 1-2 mL) was added. The solution was warmed to room temperature and the solvents were removed via reduced pressure. The crude residue was purified via chromatography yielding 11 mg of 4-[(2-{(2R)-2-[(1E,3S)-3-hydroxyoct-1-enyl]-5-oxopyrrolidin-1-yl}ethyl)thio]butanoic acid methyl ester as an oil. This was taken directly on to the next step.

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