反应详情

温度

90 °C

4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (325 mg, 1.67 mmol), cesium carbonate (600 mg, 1.84 mmol), and tert-butyl 4-[(methylsulfonyl)oxy]cyclohexanecarboxylate (513 mg, 1.84 mmol) followed by DMF (5.6 mL) were added to an oven-dried flask. The reaction mixture was stirred at 90° C. for 22 hours then cooled to room temperature, diluted with diethyl ether, washed with water (3×50 mL), and then brine. The organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure to afford tert-butyl 4-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl]cyclohexanecarboxylate (mixture of cis and trans). 1H NMR (500 MHz, CDCl3) δ 7.99 (s, 1H), 7.86 (s, 1H), 2.98 (s, 1H), 2.24-1.85 (m, 5H), 1.75-1.43 (m, 4H), 1.41 (s, 9H), 1.29 (s, 12H).

1. additionwere added to an oven-dried flask
2. temperaturethen cooled to room temperature
3. washwashed with water (3×50 mL)
4. dry with materialThe organic layer was dried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure