Chlorotrimethylsilane → HCID 18419719, compound

Participants

Reaction Conditions

Reaction Steps

Vinylmagnesium bromide (77 ml, 1M THF) was added to a slurry of copper (I) iodide (7.37 g) in tetrahydrofuran (80 ml) at −78° C. under a nitrogen atmosphere. This mixture was stirred at −40° C. for 30 minutes, then recooled to −78° C. A solution of 3-phenyl-5,6-dihydro-2-pyrone (J. Org. Chem. 1967, 32, 2354) (4.6 g) and chlorotrimethylsilane (3.28 ml) in THF (80 ml) was added to the stirred mixture. Thin layer chromatography showed all starting material had reacted. The mixture was quenched with ammonium chloride (saturated aqueous solution) at −78° C. and the resulting mixture was allowed to come to room temperature and was stirred for 2 hours until the aqueous layer became dark blue. The mixture was filtered through Celite™ to remove any insoluble inorganics and the solution was extracted with ethyl acetate (3×100 ml). The pooled organic extracts were washed with brine, dried (MgSO4) and concentrated to give a yellow oil. This was purified on silica using 30-40% ether in hexane as eluant to afford the title compound (4.9 g, crystallised on standing) as a mixture of cis and trans isomers (2:1). Recrystallisation of this mixture from ether-hexane afforded the pure cis isomer as white prisms.

Provenance & Evidence