Trifluoroacetic acid → HCID 15284123, compound

Participants

Reaction Steps

In to a cold (-78° C.) solution of tert-butyl acetate (2.7 mL, 19.96 mmol) in THF (35 mL) was added lithium bis(trimethylsilyl)amide solution (1 .0M, 21.62 mL, 21.62 mmol). After stirring for 2 hours a solution of trifluoromethanesulfonic acid 2-(5-bromo-naphthalen-2-ylmethyl)-3-oxo-cyclohex-1-enyl ester (7.7 g, 16.63 mmol) in THF (15 mL) was added dropwise. The mixture was stirred for 1 hour, quenched with aqueous NH4Cl, poured in to H2O and extracted with EtOAc, The organic extracts were dried over MgSO4. Evaporation gave a yellow oil residue which was taken up in methylene chloride (100 mL) and treated with trifluoroacetic acid (10 mL). The mixture was stirred for 5 hours and then the volatiles were removed in vacuo. The residue was purified by flash chromatography on acidic silica gel (eluting solvent hexane/EtOAc 1/1) to give a yellow solid (4.1 g, 66% yield, m.p 56°-58 ° C.).

Provenance & Evidence