反应详情

温度

110 °C

An oven-dried resealable Schlenk tube was charged with CuI (6.0 mg, 0.0315 mmol, 1.0 mol %), benzamide (460 mg, 3.80 mmol), K2CO3 (850 mg, 6.15 mmol), evacuated and backfilled with argon. trans-1,2-Cyclohexanediamine (40 μL, 0.333 mmol, 11 mol %), 2-bromoanisole (0.38 mL, 3.05 mmol) and dioxane (0.50 mL) were added under argon. The Schlenk tube was sealed and the reaction mixture was stirred magnetically at 110° C. for 23 h. The resulting suspension was cooled to room temperature and filtered through a 0.5×1 cm pad of silica gel eluting with 10 mL of ethyl acetate. The filtrate was concentrated and the residue was purified by flash chromatography on silica gel (2×20 cm; hexane-ethyl acetate 5:1; 20 mL fractions). Fractions 10–15 provided 573 mg (83% yield) of the product as a colorless oil. The 1H NMR spectrum was in accord with that reported by Narasaka et al. Tsutsi, H.; Ichikawa, T.; Narasaka, K. Bull. Chem. Soc. Jpn. 1999, 72, 1869.

1. customevacuated
2. customThe Schlenk tube was sealed
3. temperatureThe resulting suspension was cooled to room temperature
4. filtrationfiltered through a 0.5×1 cm pad of silica gel eluting with 10 mL of ethyl acetate
5. concentrationThe filtrate was concentrated
6. customthe residue was purified by flash chromatography on silica gel (2×20 cm; hexane-ethyl acetate 5:1; 20 mL fractions)