Hydroxyamine hydrochloride → 2-(3,4-dichloro-phenyl)-3-(3-hydroxyimino-cyclopentyl)-N-thiazol-2-yl-propionamide

Participants

Reaction Conditions

Reaction Steps

A solution of the 2-(3,4-dichloro-phenyl)-3-(3-oxo-cyclopentyl)-N-thiazol-2-yl-propionamide (prepared as in Example 43, 144.6 mg, 0.38 mmol) and hydroxylamine hydrochloride (39.7 mg, 0.57 mmol) in methanol (1.1 mL) and pyridine (1.1 mL) was heated under reflux for 3 h. The reaction mixture was allowed to cool to 25° C. and then was concentrated in vacuo. The resulting residue was diluted with ethyl acetate (75 mL). The organic layer was washed with a 1N aqueous hydrochloric acid solution (75 mL) and a saturated aqueous sodium chloride solution (75 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 70–230 mesh, 70% ethyl acetate/hexanes) afforded 2-(3,4-dichloro-phenyl)-3-(3-hydroxyimino-cyclopentyl)-N-thiazol-2-yl-propionamide (138.9 mg, 92%) as a white foam: mp 98–101° C. (foam to gel); (ES)+-HRMS m/e calcd for C17H17Cl2N3O2S (M+H)+ 398.0492 found 398.0496.

Provenance & Evidence