反应详情

To a solution of methyl 3-bromo-5-formylbenzoate (1.8 g, 7.4 mmol, prepared as described in WO 2003048111 from dimethyl 5-bromoisophthalate, Alfa Aesar) in methylene chloride (20 mL) was added a solution of 2.0 M dimethylamine in tetrahydrofuran (7.4 mL, 15 mmol). This mixture was stirred for 15 minutes, followed by the addition of sodium triacetoxyborohydride (4.7 g, 22 mmol). The resulting mixture was stirred overnight. Saturated sodium bicarbonate solution was added and the product was extracted with ethyl acetate. The combined organic extracts were washed twice with water, once with brine, dried over sodium sulfate, filtered and concentrated to afford a light yellow oil. Yield: 1.87 g (93%); LC-MS: 272.0, 274.0 (M+H)+. 1H NMR (400 MHz, CDCl3): δ 8.06 (dd, 1H), 7.89 (dd, 1H), 7.69 (dd, 1H), 3.91 (s, 3H), 3.42 (s, 2H), 2.24 (s, 6H).

1. stirringThe resulting mixture was stirred overnight
2. extractionthe product was extracted with ethyl acetate
3. washThe combined organic extracts were washed twice with water, once with brine
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. customto afford a light yellow oil