1-Bromo-3-chloropropane → 1-[3-(3-Chloropropoxy)phenyl]ethanone

To a suspension of NaH (50.5 mg, 2.00 mmol) in DMF (1.00 mL) was added 1-(3-hydroxyphenyl)ethanone (136 mg, 1.00 mmol) at 0° C. The reaction mixture was stirred at room temperature for 1 h. To this mixture was added a solution of 1-bromo-3-chloropropane (188 mg , 1.20 mmol) in DMF (0.500 mL). The reaction mixture was stirred at room temperature for 5 h. The resulting crude mixture was diluted with water (20 mL), the aqueous layer was extracted with CH2Cl2 (3×20 mL). The combined organic layers were washed with brine (20 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by preparative TLC using hexane:EtOAc (4:1) to afford the desired product 1-[3-(3-chloropropoxy)phenyl]ethanone (235 mg, 55.2%): 1H NMR (400 MHz, CDCl3) δ 7.7 (d, 1H, J=6.6 Hz), 7.52 (s, 1H), 7.25 (t, 1H, J=6.6 Hz), 7.01 (m, 1H), 4.11 (t, 2H, J=7.9 Hz), 3.69 (t, 2H, J=7.9 Hz), 2.61 (s, 3H), 1.95-1.92 (m, 2H).

1. stirringThe reaction mixture was stirred at room temperature for 5 h
2. extractionthe aqueous layer was extracted with CH2Cl2 (3×20 mL)
3. washThe combined organic layers were washed with brine (20 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by preparative TLC

ORD record

ord-14ca45549c0b4062b4146c39a70799da

Source dataset

uspto-grants-2004_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06727264B1