3-(Methylthio)propanoic acid → 6-(2-Chlorophenyl)-6-(3-(methylthio)propanoyl)amino-2-cyclohexen-1-one

Participants

Reaction Steps

A solution of 6-amino-6-(2-chlorophenyl)-2-cyclohexen-1-one (50 mg, 0.23 mmol), 3-(methylthio)propanoic acid (prepared by the known base hydrolysis from the commercial methyl ester)(33 mg, 0.28 mmol), hydroxybenzotriazole (31 mg, 0.23 mmol), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (66 mg, 0.35 mmol) in dimethylformamide (1 ml) was stirred at room temperature for 18 h. The reaction was partitioned between saturated bicarbonate and ethyl acetate, the organic phase was washed with brine, dried (Na2SO4), and the solvent removed by evaporation. Purification was achieved by preparative thin layer chromatography on silica gel eluting with 1:1 ethyl acetate/hexane. Isolation of the UV active band at Rf 0.4 gave 6-(2-chlorophenyl)-6-(3-(methylthio)propanoyl)amino-2-cyclohexen-1-one (60.6 mg, 65%). The title compound was found to be active at 6 μm in the CMK assay.

Provenance & Evidence