反应详情

To solution of potassium bromide (29.6 g, 248 mmol) in nitric acid (21% by volume, 149 g, 497 mmol), was added dichloroethane (188 mL) and tetrabutylammonium chloride (1.04 g, 3.73 mmol) followed by 4-(bromomethyl)anisol (25.0 g, 124 mmol) in dichloroethane (62 mL), and the reaction was stirred at room temperature for 5 h. The organic layer was separated, washed with water (2×100 mL, 2×150 mL), 2% aqueous potassium carbonate (150 mL), dried over sodium sulfate, and the solvent removed under vacuum. The residue was purified by being run through a flash silica gel plug (10% ethyl acetate in hexanes) to give the title compound (I-42) (9.22 g, 26% yield). 1H NMR (400 MHz, CDCl3) δ: 7.59 (d, 1H), 7.30 (dd, J=8.2, 2.2 Hz, 1H), 6.85 (d, J=8.4 Hz, 1H), 4.44 (s, 2H), 4.44 (s, 3H).

1. customThe organic layer was separated
2. washwashed with water (2×100 mL, 2×150 mL), 2% aqueous potassium carbonate (150 mL)
3. dry with materialdried over sodium sulfate
4. customthe solvent removed under vacuum
5. customThe residue was purified