Dimethyl Sulfoxide → Benzene, 4-bromo-2-methoxy-1-(1-methylethoxy)-

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

2-Bromopropane (3.39 mL, 36.2 mmol) was added to a suspension of 4-bromo-2-methoxy-phenol (5 g, 24.1 mmol), K2CO3 (6.67 g, 48.3 mmol) and DMSO (71 mL) at room temperature. The heterogeneous mixture was stirred at 55° C. for 2 hours, then cooled to room temperature and diluted with water. The reaction mixture was extracted with Et2O and the extract was washed successively with 10% aq. NaOH solution, water, then brine solution. The organics were separated and dried over sodium sulfate, filtered and concentrated in vacuo to give 4-bromo-1-isopropoxy-2-methoxy-benzene (5.83 g, 94%) as a pale yellow oil. ESI-MS m/z calc. 244.0. Found 245.0 (M+1)+; Retention time: 1.93 minutes (3 min run). 1H NMR (400 MHz, CDCl3) δ 7.03-6.95 (m, 2H), 6.76 (dd, J=7.7, 1.1 Hz, 1H), 4.47 (dt, J=12.2, 6.1 Hz, 1H), 3.84 (s, 3H), 1.35 (d, J=6.1 Hz, 6H).

Herkunft & Nachweise