Chloroacetyl chloride → 2-Chloro-1-[4-[4-(trifluoromethyl)phenyl]piperazin-1-yl]ethan-1-one

To a mixture of 1-[4-(trifluoromethyl)phenyl]piperazine (600 mg, 2.61 mmol) and triethylamine (660 mg, 6.52 mmol) in dichloromethane (20 ml) was added 2-chloroacetyl chloride (380 mg, 3.36 mmol) dropwise at 0° C. The resulting solution was stirred for 1 hour at room temperature. The reaction mixture was then quenched by water (80 ml) and extracted with dichloromethane (3×30 ml). The organic layers were combined, dried over anhydrous magnesium sulfate, and concentrated under vacuum. The residue was purified by silica gel column chromatography using 1%-10% ethyl acetate in petroleum ether to afford 2-chloro-1-[4-[4-(trifluoromethyl)phenyl]piperazin-1-yl]ethan-1-one as a white solid (479 mg, 60%). (ES, m/z): [M+H]+ 307.1; 1H NMR (300 MHz, CDCl3): δ 7.52 (d, J=8.4 Hz, 2H), 6.97 (d, J=8.7 Hz, 2H), 4.12 (s, 1H), 3.81 (t, J=5.1 Hz, 2H), 3.72 (t, J=5.1 Hz, 2H), 3.36 (t, J=5.1 Hz, 2H), 3.30 (t, J=5.1 Hz, 2H).

1. customThe reaction mixture was then quenched by water (80 ml)
2. extractionextracted with dichloromethane (3×30 ml)
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under vacuum
5. customThe residue was purified by silica gel column chromatography

ORD record

ord-5274383c67294c4c89f9415398c01dc3

Source dataset

uspto-grants-2016_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09249102B2