Acetaldehyde → 1-(2-Chloro-8-fluoroquinolin-3-yl)ethanol

Temperature

-78 °C

2-Chloro-8-fluoroquinoline (182 mg, 1.0 mmol) was dissolved in THF (2 mL) and cooled to −78° C. To this solution was added Lithium diisopropylamide (1M solution in THF, 1.1 mL, 1.1 mmol, 1.1 eq). The reaction was allowed to stir at −78° C. for 20 min, after which time acetaldehyde (113 μl, 2.0 mmol, 2 eq.) was added via syringe. After 30 minutes, the reaction was quenched with water and diluted with ethyl acetate. The layers were separated and washed with brine. The crude reaction mixture was purified by column chromatography (8:2 hexanes:ethyl acetate) to afford 1-(2-chloro-8-fluoroquinolin-3-yl)ethanol. 1H NMR (400 MHz, CDCl3) δ ppm 8.43 (br s, 1H), 7.64 (td, J=7.8, 5.1 Hz, 1H), 7.41 (ddd, J=10.2, 7.4, 1.2 Hz, 1H), 5.39 (qdd, J=6.3, 3.9, 0.8 Hz, 1H), 2.22 (d, J=3.9 Hz, 1H), 1.62 (d, J=6.3 Hz, 3H).

1. waitAfter 30 minutes
2. customthe reaction was quenched with water
3. additiondiluted with ethyl acetate
4. customThe layers were separated
5. washwashed with brine
6. customThe crude reaction mixture
7. customwas purified by column chromatography (8:2 hexanes:ethyl acetate)

ORD record

ord-3608627d884144e48aa7404a3aaaa955

Source dataset

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08193199B2