反应详情

温度

45 °C

To an oven dried, argon filed, flask was added 1-bromo-3-nitrobenzene (14) (3.09 g, 15.3 mmol), tert-butyl prop-2-ynylcarbamate (15) (2.8 g, 18.0 mmol), diisopropylamine (92.5 ml, 17.8 mmol), CuI (0.054 g, 0.18 mmol), PdCl2(PPh3)2 (0.42 g, 0.6 mmol) and dioxane (17 ml). The resulting mixture was purged with argon three times and then a solution of t-Bu3P-dioxane solution (0.9 ml, 0.9 mmol) was added. The mixture was heated at 45° C. for 15 h, cooled to room temperature, diluted with ethyl acetate, filtered through celite and the filtrate was concentrated under reduced pressure. Purification by flash chromatography (10 to 50% EtOAc-hexanes gradient) gave tert-butyl 3-(3-nitrophenyl)prop-2-ynylcarbamate (16) as colorless oil. Yield (4.98 g, 100%); 1H NMR (400 MHz, CDCl3) δ 8.25 (t, J=1.6 Hz, 1H), 8.15 (ddd, J=8.4, 2.4, 1.2 Hz, 1H), 7.69 (dt, J=7.6, 0.8 Hz, 1H), 4.78 (br s, 1H), 4.16 (d, J=5.6 Hz, 2H), 1.47 (s, 9H).

1. customTo an oven dried
2. customThe resulting mixture was purged with argon three times
3. temperaturecooled to room temperature
4. filtrationfiltered through celite
5. concentrationthe filtrate was concentrated under reduced pressure
6. customPurification by flash chromatography (10 to 50% EtOAc-hexanes gradient)