Cyclopentanecarbonyl chloride → ethyl (RS)-(4-cyano-phenylamino)-[3-(cyclopentanecarbonyl-amino)-5-ethyl-phenyl]-acetate

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Reaction Steps

Cyclopentanecarbonyl chloride (0.104 ml, 0.85 mmol) was added dropwise at 0° C. to a solution of the ethyl (RS)-(3-amino-5-ethyl-phenyl)-(4-cyano-phenylamino)-acetate (250 mg, 0.772 mmol) obtained in Example 223.4 and diisopropylethylamine (0.146 ml, 0.85 mmol) in CH2Cl2 (5 ml). The reaction mixture was warmed slowly (2 h.) to room temperature. A saturated aqueous solution of KHSO4 was added and the mixture was extracted with EtOAc. The organic phase was washed with H2O, dried and filtered, and the filtrate was concentrated. The residue was purified by chromatography (SiO2, hexane→hexane/EtOAc 2:1). There were obtained 215 mg (66%) of ethyl (RS)-(4-cyano-phenylamino)-[3-(cyclopentanecarbonyl-amino)-5-ethyl-phenyl]-acetate as a colorless foam; MS: 418 ([M−H]−).

Provenance & Evidence