Ammonium Chloride → 5-Chloro-2-(4-chloro-2-trifluoromethylphenyl)pentanoic acid amide

Participants

Reaction Steps

Ammonium chloride (3.23 g), 1-hydroxybenzotriazole (2.45 g), IPEA (13.7 mL) and benzotriazol-1-yloxytris(pyrrolidino)phosphonimn hexafluorophosphate (9.43 g) were sequentially added to a solution of 5-chloro-2-(4-chloro-2-trifluoromethylphenyl)pentanoic acid (4.75 g) in N,N-dimethylformamide (45 mL). The mixture was stirred at room temperature overnight. Ice water and tert-butyl methyl ether were added to the reaction solution, and the organic layer was separated. The aqueous layer was reextracted with tert-butyl methyl ether. The combined organic layers were sequentially washed with 1 N hydrochloric acid, water, a saturated sodium bicarbonate aqueous solution and brine, dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (carrier: Wakogel™ C-200; elution solvent:heptane:ethyl acetate=4:1→3:1) to obtain 3.89 g of the title compound. The property values of the compound are as follows.

Provenance & Evidence