反应详情

To a solution of 2-bromo-4-methylphenol (1 g, 5.35 mmol) and 3-methylpent-4-en-2-ol (2.68 g, 26.7 mmol) in THF (20 mL) was added Ph3P (7.01 g, 26.7 mmol) followed by DEAD (4.23 mL, 26.7 mmol) and the resulting mixture was stirred at room temp for 16 h. Water was then added and the mixture was extracted with ether (2×50 mL), dried (Na2SO4), filtered and concentrated. The residue was then purified by Biotage (0-20% EtOAc/hexane) to afford 2-bromo-4-methyl-1-((3-methylpent-4-en-2-yl)oxy)benzene (860 mg, 3.19 mmol, 59.8% yield) as yellow oil. Product is approx 2:1 mixture of trans/cis isomers. 1H NMR (400 MHz, CDCl3) δ 7.38 (d, J=2.0 Hz, 1H), 7.08-7.01 (m, 1H), 6.83-6.79 (m, 1H), 6.02-5.89 (m, 1H), 5.16 (q, J=1.8 Hz, 0.5H), 5.14-5.08 (m, 1.5H), 4.31-4.37 (m, 0.3H), 4.28-4.19 (m, 0.7H), 2.64-2.50 (m, 1H), 2.29 (s, 3H), 1.30-1.24 (m, 3H), 1.19-1.14 (m, 3H).

1. extractionthe mixture was extracted with ether (2×50 mL)
2. dry with materialdried (Na2SO4)
3. filtrationfiltered
4. concentrationconcentrated
5. customThe residue was then purified by Biotage (0-20% EtOAc/hexane)