4-Bromo-2,6-Diisopropylphenol

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: This is a modification of the procedure of Schuster, Ingeborg I.; Parvez, Masood; Freyer, Alan J. J. Org. Chem. 1988, 53, 5819. A solution of bromine (6.3 mL, 119 mmol) in acetic acid (40 mL) was added dropwise to a stirred, room temperature solution of 2,6-diisopropylphenol (20 mL, 97.1 mmol of 90% tech. grade) in acetic acid (280 mL). After 6 h, water was added and the mixture was extracted with ether. The ether phase was dried and concentrated and the residue was flash chromatographed (petroleum ether: eluent) to provide 4-bromo-2,6-diisopropylphenol (16.2 g, 65%) as a red oil. This oil was dissolved in DMF (50 mL), iodomethane (11.7 mL, 189 mmol) and potassium carbonate (26.3 g, 117 mL) were added to it. This reaction mixture was stirred for 5 h and diluted with water. This mixture was extracted with ether and the ether extracts were dried, concentrated and flash chromatographed (petroleum ether: eluent) to provide the title compound as a colorless oil (15.4 g, 90%): NMR (CDCl3); δ 7.17 (s, 2H), 3.70 (s, 3H), 3.29 (septet, 1H), 1.20 (d, 12 H). the mixture was extracted with ether The ether phase was dried concentrated chromatographed (petroleum ether: eluent)