Allyl bromide → HCID 10421382, compound

Participants

Reaction Steps

To a solution of 3.52 g (20 mmol) 8-methoxy-2-tetralone in 50 mL THF in a three-neck round-bottomed flask, equipped with a gas inlet and septum, was added 14.3 mL LDA (22 mmol, 1.5M in cyclohexane) at -30° C. under a nitrogen atmosphere. The solution was allowed to warm to 0° C. over a thirty-minute period and 2.4 mL (24 mmol) allyl bromide was added. TLC analysis was used to monitor the reaction. After stirring for two hours, the TLC analysis appeared to show little progress. The reaction mixture was therefore treated with 1.1 mL (12 mmol) allylbromide and the mixture was heated to reflux for 72 hours. The reaction mixture was quenched with 10% sodium bisulfate to pH 2-3. After removal of THF under reduced pressure, the mixture was extracted with ethyl acetate (2×1 L) and the combined organic layers were washed with brine, dried (MgSO4), filtered and concentrated in vacuo. The resulting oil was purified by liquid chromatography on 400 g of silica gel 60 (230-400 m), eluting with hexane/acetone (9:1) and collecting 40 mL fractions. Fractions homogeneous by TLC were combined and concentrated in vacuo to give 4.5 g (97.8%) of pure title compound as a near colorless oil.

Provenance & Evidence