Methanol → 3-Cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide

Temperature

25 °C

A solution of 3-cyclopentyl-2-(3,4-dichlorophenyl)-propionic acid (366 mg, 1.27 mmol) in methylene chloride (10 mL) and 1 drop of N,N-dimethylformamide was cooled to 0° C. and then treated with a 2.0M solution of oxalyl chloride in methylene chloride (0.76 mL, 1.53 mmol). The reaction was stirred for 30 min at 0° C., at which time, 1,1,1,3,3,3-hexamethyldisilazane (0.81 mL, 3.81 mmol) was added to the reaction mixture. The reaction was allowed to slowly warm to 25° C. and then stirred at 25° C. for 16 h. The reaction mixture was then treated with methanol (5 mL). The resulting reaction mixture was washed with a 5% aqueous sulfuric acid solution (2×10 mL). The combined aqueous layers were extracted with methylene chloride (3×10 mL). The combined organic layers were then washed with a saturated aqueous sodium chloride solution (1×10 mL), dried over magnesium sulfate, filtered and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 70/30 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide (229 mg, 63%) as a white solid: mp 98.6-100.1° C.; EI-HRMS m/e calcd for C14H17Cl2NO (M+) 285.0687, found 285.0688.

1. additionwas added to the reaction mixture
2. customThe resulting reaction mixture
3. washwas washed with a 5% aqueous sulfuric acid solution (2×10 mL)
4. extractionThe combined aqueous layers were extracted with methylene chloride (3×10 mL)
5. washThe combined organic layers were then washed with a saturated aqueous sodium chloride solution (1×10 mL)
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo

ORD record

ord-aa5d6e5f16434e7c8f3bf2898d46399c

Source dataset

uspto-grants-2003_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06528543B1