反应 #5219

反应方程式

dimethylformamide

2-chloroquinoline

diisopropylamine

n-BuLi

→

2-chloro-3-quinolinecarboxaldehyde

收率 92.2%

溶剂

THF

反应条件

后处理

1. 1
   workup.STIRRINGthe reaction mixture was stirred an additional 30 min at this temperature
2. 2
   其他After quenching at -78° C. with glacial acetic acid (1 mL)
3. 3
   温度the mixture was warmed to room temperature
4. 4
   workup.ADDITIONdiluted with ether (30 mL)
5. 5
   洗涤The organic phase was washed with saturated NaHCO3 solution (10 mL) and brine (10 mL)
6. 6
   干燥was dried over MgSO4
7. 7
   浓缩Concentration

实验过程

To a solution of 0.46 mL (3.30 mmol) of diisopropylamine in 8 mL of THF at 0° C. was added 1.53 mL (3.30 mmol) of n-BuLi dropwise. After 20 min the solution was cooled to -78° C. and 2-chloroquinoline (491 mg, 3.0 mmol) was added neat. The mixture was stirred at -78° C. for 30 min, then dimethylformamide (0.39 mL, 5.04 mmol) was added dropwise and the reaction mixture was stirred an additional 30 min at this temperature. After quenching at -78° C. with glacial acetic acid (1 mL), the mixture was warmed to room temperature and diluted with ether (30 mL). The organic phase was washed with saturated NaHCO3 solution (10 mL) and brine (10 mL), and was dried over MgSO4. Concentration afforded 2-chloro-3-quinolinecarboxaldehyde (530 mg, 92%) as a light yellow solid (mp 145°-149° C.), which was used directly in the next step without further purification. Recrystallization from ethyl acetate afforded the pure compound as light yellow needles: mp 149°-150° C. (mp 148°-149° C. reported in Meth-Cohn, O.; Narhe, B.; Tarnowski, B. J. Chem. Soc. Perkin Trans. I 1981, 1520.). 1H NMR (300 MHz, CDCl3) δ 10.57 (s, 1H), 8.77 (s, 1H), 8.08 (d, 1H, J=9 Hz), 8.0 (d, 1H, J=9 Hz), 7.90 (t, 1H, J=9 Hz), 7.67 (t, 1H, J=9 Hz); IR (nujol) 1685, 1575, 1045, 760, 745 cm-1.

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