4-(Trifluoromethyl)aniline → methyl (3R)-3-(4-trifluoromethylphenylamino)-pentanoate

Participants

Reaction Conditions

Reaction Steps

[RuCl(p-cymene)((R)-segphos)]Cl(17.6 mg, 0.0192 mmol), methyl 3-oxopentanoate (500 mg, 3.842 mmol), 4-trifluoromethylaniline (619 mg, 3.842 mmol) and 2-propanol (2.5 mL) were placed in a 2.5 mL-stainless autoclave under atmosphere of nitrogen, and the mixture was stirred under a hydrogen pressure of 3 MPa at 80° C. for 15 hours. After completion of the reaction, the solvent was removed by evaporation in vacuo, and the residue was purified by column chromatography on silica gel (eluent: hexane ethyl acetate=3/1) to give methyl (3R)-3-(4-trifluoromethylphenylamino)-pentanoate (109 mg) as a colorless oil in 10.3% yield. The enantiomeric excess of the product was found to be 92.7% ee determined by HPLC analysis using a SUMICHIRAL OA-2500 column (available from SUMIKA CHEMICAL ANALYSIS SERVICE LTD.).

Provenance & Evidence