1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 5-(2-Fluoro-phenyl)-isoxazole-3-carboxylic acid {2-[4-(5-fluoro-2-trifluoromethyl-benzoyl)-piperazin-1-yl]-2-oxo-ethyl}-amide

DIPEA (219 mg, 0.29 mL, 1.68 mmol) was added to a stirred solution of 5-(2-fluoro-phenyl)-isoxazole-3-carboxylic acid (100 mg, 0.48 mmol) in DMF (2 mL). HOBT (68.5 mg, 0.5 mmol) and EDCI (97.2 mg, 0.5 mmol) were then added at room temperature. After 2 minutes, 2-amino-1-[4-(5-fluoro-2-trifluoromethyl-benzoyl)-piperazin-1-yl]-ethanone hydrochloride salt (100 mg, 0.48 mmol) was added and the resulting mixture was stirred at room temperature overnight. Cold water was then added and filtered the solid precipitated. The obtained solid was purified by column chromatography (using silica gel of 60-120 mesh and 50% EtOAc in hexane as eluent) to afford 82 mg (32.5% yield) of 5-(2-fluoro-phenyl)-isoxazole-3-carboxylic acid {2-[4-(5-fluoro-2-trifluoromethyl-benzoyl)-piperazin-1-yl]-2-oxo-ethyl}-amide. LCMS Purity: 98.05%. 1H NMR (DMSO-d6): δ 8.8 (t, 1H), 7.9 (m, 2H), 7.4 (m, 5H), 7.2 (d, 1H), 7.2 (d, 1H), 4.2 (m, 2H), 3.9 (m, 1H), 3.5 (m, 3H), 3.4 (m, 1H), 3.1 (m, 2H).

1. filtrationfiltered the solid
2. customprecipitated
3. customThe obtained solid was purified by column chromatography (using silica gel of 60-120 mesh and 50% EtOAc in hexane as eluent)

ORD record

ord-d9cc55adffd544cb920f391705d3757b

Source dataset

uspto-grants-2010_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07842696B2