反应详情

To a stirred mixture of 4-formylbenzoic acid (900 mg, 6 mmol) in anhydrous dichloromethane (30 mL) was added triethylamine (1.52 mg, 15 mmol), 1-hydroxybenzotriazole (891 mg, 6.6 mmol), followed by 1-ethyl-3-(3-dimethylamino propyl)carbodiimide hydrochloride (1.254 g, 6.6 mmol). After the addition, the mixture was stirred at room temperature for 40 mins. Then the mixture was cooled to 0° C. and cyclopropyl(piperazin-1-yl)methanone hydrochloride (1.259 g, 6.6 mmol) was added in portion-wise. After the addition, the mixture was allowed to stir at room temperature overnight. The mixture was diluted with dichloromethane (50 mL), washed with saturated citric acid (100 mL×2), followed by saturated sodium bicarbonate (100 mL×2), brine (50 mL), dried over anhydrous sodium sulfate, and concentrated to give 4-(4-(cyclopropanecarbonyl)piperazine-1-carbonyl)benzaldehyde (810 mg, yield 80%) as a light yellow oil. 1H-NMR (400 MHz, CDCl3) δ (ppm): 0.79-0.85 (m, 2H), 1.00-1.04 (m, 2H), 1.72-1.80 (m, 1H), 3.41-3.81 (m, 8H), 7.58-7.60 (d, J=8.0 Hz, 1H), 7.95-7.97 (d, J=8.0 Hz, 1H), 10.07 (s, 1H); LC-MS (ESI) m/z: 287 (M+1)+.

1. additionAfter the addition
2. temperatureThen the mixture was cooled to 0° C.
3. additionAfter the addition
4. stirringto stir at room temperature overnight
5. washwashed with saturated citric acid (100 mL×2)
6. dry with materialdried over anhydrous sodium sulfate
7. concentrationconcentrated