Potassium Carbonate → 4-(Benzyloxy)-1-bromo-2-(2-methylallyloxy)benzene

To a solution of 5-(benzyloxy)-2-bromophenol (Simas, A. B. C., et al, Synthesis, (1999):1017-21) (8.15 g, 29.3 m mol) in DMF (150 mL) was added potassium carbonate (4.46 g, 32.2 mmol) slowly at 0° C. The mixture was stirred at ambient temperature for half an hour, followed by the addition of 3-bromo-2-methylpropene (3.35 mL, 32.2 mmol) during half an hour at 0° C. The mixture was stirred at ambient temperature overnight and quenched with saturated ammonium chloride (50 mL). The aqueous mixture was extracted with ethyl acetate (3×200 mL). The combined organic layers was dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo. The residue was subjected to column chromatography (ethyl acetate/hexane, 1/20) to give the title compound (10.0 g, 94%): 1H NMR (300 MHz, CDCl3) δ 7.43-7.29 (m, 5H), 6.53 (d, 1H), 6.45 (dd, 1H), 5.15-4.94 (m, 4H), 4.43 (s, 2H), 1.82 (s, 3H); 13C NMR (75 MHz, CDCl3) δ 159.1, 155.6, 140.1, 136.5, 133.1, 128.6, 128.1, 127.5, 112.9, 107.2, 103.3, 102.0, 72.4, 70.3, 19.3.

1. custom, et al, Synthesis, (1999)
2. stirringThe mixture was stirred at ambient temperature overnight
3. customquenched with saturated ammonium chloride (50 mL)
4. extractionThe aqueous mixture was extracted with ethyl acetate (3×200 mL)
5. dry with materialThe combined organic layers was dried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationThe filtrate was concentrated in vacuo

ORD record

ord-36a8bc1aa97745958756ea83277d07f0

Source dataset

uspto-grants-2010_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07700641B2