Ethyl ketone → 3-(2-Bromo-5-methylphenyl)pentan-3-ol

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-bromo-2-iodo-4-methylbenzene (28 g, 94 mmol) in THF (10 ml) at −10° C. under nitrogen was slowly added i-PrMgBr (47 ml, 94 mmol). The reaction mixture was stirred for 1 h at −10° C. Then the reaction mixture was cooled to −30° C., and pentan-3-one (8.1 g, 94 mmol) was added dropwise. The reaction mixture was stirred for 1 h at −30° C. under nitrogen and then warmed to rt and stirred for additional 2 h. Then the reaction mixture was quenched with 2N HCl solution and extracted with EA. The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by column chromatography over silica gel eluted with PE:EA (10:0 to 5:1) to give the desired compound (6.5 g, yield 26.9%) as colorless oil. 1H NMR (300 MHz, CDCl3): δ 7.52-7.50 (d, 1H), 7.43-7.40 (d, 1H), 6.95-6.92 (d, 1H), 2.48-2.40 (q, 2H), 2.31 (s, 3H), 1.86-1.78 (q, 2H), 0.77-0.71 (m, 6H). MS: m/z=257 and 259 [M+1]+.

Provenance & Evidence