反应详情

温度

110 °C

An oven-dried resealable Schlenk tube was charged with CuI (2.0 mg, 0.0105 mmol, 1.0 mol %), K3PO4 (450 mg, 2.12 mmol), evacuated and backfilled with argon. trans-1,2-Cyclohexanediamine (13 μL, 0.108 mmol, 10 mol %), 5-iodo-m-xylene (150 μL, 1.04 mmol), 2-pyrrolidinone (94 μL, 1.24 mmol) and dioxane (1.0 mL) were added under argon. The Schlenk tube was sealed and the reaction mixture was stirred magnetically at 110° C. for 24 h. The resulting pale yellow 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 3:2; 20 mL fractions). Fractions 12-23 provided 193 mg (98% yield) of the product as white crystals. 1H NMR (400 MHz, CDCl3): δ 7.23 (s, 2H), 6.82 (s, 1H), 3.85 (t, J=7.1 Hz, 2H), 2.61 (t, J=8.1 Hz, 2H), 2.34 (s, 6H), 2.16 (tt, J=8.1, 7.1 Hz, 2H). 13C NMR (100 MHz, CDCl3): δ 174.1, 139.2, 138.4, 126.3, 118.0, 49.1, 32.8, 21.5, 18.1. IR (neat, cm−1): 1692, 1596, 1480, 1393, 1333, 1247, 852. Anal. Calcd for C12H15NO: C, 76.16; H, 7.99. Found: C, 76.06; 8.06.

1. customevacuated
2. customThe Schlenk tube was sealed
3. temperatureThe resulting pale yellow 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 3:2; 20 mL fractions)