O-Methylhydroxylamine hydrochloride → 2-(3-chloro-4-methanesulfonyl-phenyl)-3-(4-methoxyimino-cyclohexyl)-N-pyrazin-2-yl-propionamide

Participants

Reaction Conditions

Reaction Steps

A solution of methoxylamine hydrochloride (23 mg, 0.27 mmol) in methanol (0.5 mL) and pyridine (0.5 mL) was treated with 2-(3-chloro-4-methanesulfonyl-phenyl)-3-(4-oxo-cyclohexyl)-N-pyrazin-2-yl-propionamide (prepared as in Example 58, 80 mg, 0.18 mmol). The reaction mixture was heated under reflux for 2 h, cooled to 25° C., and concentrated in vacuo to remove methanol. The resulting residue was suspended in ethyl acetate (10 mL), washed with water 1×5 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 12M, Silica, 35/65 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-(4-methoxyimino-cyclohexyl)-N-pyrazin-2-yl-propionamide (68 mg, 81%) was a white foam: EI-HRMS m/e calcd for C21H25ClN4O4S (M+H)+ 465.1358. found 465.1364.

Provenance & Evidence