Triphenylphosphine → Methyl 3(S)-(acetylthio)butanoate

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To a -23° C. solution of PPh3 (40 mmol, 10.48 g) in THF (100 mL) was added DEAD (diethylazodicarboxylate) (40 mmol, 6.28 mL) dropwise and the mixture was stirred at -23° C. for 16 h, during which time a white precipitate was obtained. A THF (30 mL) solution of methyl 3(R)-hydroxybutyrate (20 mmol, 2.36 g) and thiolacetic acid (40 mmol, 2.85 mL) was slowly added and the mixture was allowed to slowly warm to 25° C. and was stirred 16 h at 25° C. Most of the THF was removed in vacuo and EtOAc (10 mL) and hexanes (100 mL) were added. Insolubles were removed by filtration and the residue was purified by chromatography on silica gel to afford the title compound (yield: 45%). [α]D25 =-21 ° (c=3, CHCl3 ). 1H NMR (acetone d6) δ1.30 (3H, d), 2.25 (3H, s), 2.45-2.80 (2H, m), 3.62 (3H, s), 3.75-3.95 (1H, m).

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