Dimethylformamide → 2-Chloro-3-quinolinecarboxaldehyde

Temperature

-78 °C

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.

1. stirringthe reaction mixture was stirred an additional 30 min at this temperature
2. customAfter quenching at -78° C. with glacial acetic acid (1 mL)
3. temperaturethe mixture was warmed to room temperature
4. additiondiluted with ether (30 mL)
5. washThe organic phase was washed with saturated NaHCO3 solution (10 mL) and brine (10 mL)
6. dry with materialwas dried over MgSO4
7. concentrationConcentration

ORD record

ord-7a1d2e696c6b46dbab2943263f0f50cb

Source dataset

uspto-grants-1993_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05212317