Hydroxyamine hydrochloride → N-(5-bromo-pyrazin-2-yl)-2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-(4-hydroxyimino-cyclohexyl)-propionamide

Participants

Reaction Conditions

Reaction Steps

A solution of hydroxylamine hydrochloride (7.0 mg, 0.099 mmol) in methanol (0.2 mL) and 2,6-lutidine (0.2 mL) was treated with N-(5-bromo-pyrazin-2-yl)-2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-(4-oxo-cyclohexyl)-propionamide (prepared as in Example 60, 34 mg, 0.066 mmol). The reaction mixture was stirred at 25° C. for 30 min and was then 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, 65/35 hexanes/ethyl acetate to 2/3 hexanes/ethyl acetate) afforded the N-(5-bromo-pyrazin-2-yl)-2(R)-(3-chloro-4-methanesulfonyl-phenyl)-3-(4-hydroxyimino-cyclohexyl)-propionamide (30 mg, 85.8%) was a white foam: [α]23589=−21.43° (c=0.35, chloroform); EI-HRMS m/e calcd for C20H22BrClN4O4S (M+H)+ 529.0307. found 529.0314.

Provenance & Evidence