O-Methylhydroxylamine hydrochloride → 2-(3,4-dichloro-phenyl)-3-(3-methoxyimino-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, 159.9 mg, 0.41 mmol) and methoxyamine hydrochloride (52.3 mg, 0.62 mmol) in methanol (1.2 mL) and pyridine (1.2 mL) was heated under reflux for 3.5 h. The reaction mixture was allowed to cool to 25° C. and then concentrated in vacuo. The resulting residue was diluted with ethyl acetate (75 mL), 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, 230-400 mesh, 50% ethyl acetate/hexanes) afforded 2-(3,4-dichloro-phenyl)-3-(3-methoxyimino-cyclopentyl)-N-thiazol-2-yl-propionamide (168.2 mg, 98%) as a white foam: mp 69-72° C. (foam to gel); (ES)+-HRMS m/e calcd for C18H19Cl2N3O2S (M+H)+ 412.0648. found 412.0652.

Provenance & Evidence