Methyl acetoacetate → Methyl 3-oxo-5-(phenylthio)pentanoate

Participants

Reaction Conditions

Reaction Steps

To a suspension of NaH (60%) (815 mg, 20.39 mmol) in THF-HMPA (20 ml, 5 ml) was added methylacetoacetate (2.0 g, 18.5 mmol) in THF (5 ml) at 0° C. The mixture was stirred for 10 min. at 0° C. under nitrogen atmosphere. BuLi (12.3 ml, 20.39 mmol) was dropwise added and the red mixture was stirred for 15 min. at 0° C. Then a solution of chlorothioanisole (2.7 ml, 20.39 mmol) in THF (5 ml) was added to the mixture at 0° C. The mixture was stirred for 1 h at -5° C. The mixture was quenched with H2O, then extracted with AcOEt (100 ml×2). AcOEt layer was washed with H2O (10 ml×2) and brine (10 ml), then dried over MgSO4 and evaporated. The residue was purified by a silica gel column chromatography (150 g, hexane :AcOEt=6:1) to give a colorless oil (1.0 g, 22.7%).

Provenance & Evidence