Water → Isohexane ethyl acetate

Participants

Reaction Conditions

Reaction Steps

Ethoxycarbonylmethylene triphenyl phosphorane (33.8 g) in dry THF (200 ml) was treated with isopropyl isothiocyanate (10.1 g) at 65° C. for 16 h under nitrogen. The mixture was cooled to −78° C. and methyl 3-bromo-2-oxo-butanoate (19.5 g) was added. The reaction was allowed to warm slowly to room temperature. After 24 h at room temperature more methyl 3-bromo-2-oxo-butanoate (2.8 g) was added and the mixture was warmed to 60° C. for 16 h. The cooled reaction was poured into water (1.5 L) and extracted into ether. Drying and evaporation gave an oil which was chromatographed (SiO2/10:1 isohexane-ethyl acetate then 5:1 isohexane-ethyl acetate) to afford the subtitle compound (23.5 g).

Provenance & Evidence