Acetic Acid → N-[(2-bromo-5-methoxyphenyl)carbonyl]-4-(5-bromo-1-methyl-2-oxo-3-pyridinyl)-L-phenylalanine

Participants

Reaction Steps

A solution of N-[(2-bromo-5-methoxyphenyl)carbonyl]-4-(5-bromo-1-methyl-2-oxo-3-pyridinyl)-L-phenylalanine methyl ester (29 mg, 0.05 mmol) in THF (3 mL) was treated with a solution of lithium hydroxide monohydrate (20 mg, 0.47 mmol) in water (1.0 mL). Methanol (0.5 mL) was added to effect a clear solution and the reaction mixture was stirred 18 hr. Acetic acid (0.5 mL) was added, the entire reaction mixture was applied to a 4×30 cm, C-18 reversed phase HPLC column and eluted with a gradient of acetonitrile in water of 5 to 95% over 35 min. The product containing fraction was lyophillyzed to give N-[(2-bromo-5-methoxyphenyl)carbonyl]-4-(5-bromo-1-methyl-2-oxo-3-pyridinyl)-L-phenylalanine (22 mg, 79%) as a white solid. HRMS: Obs. Mass 562.9814. Calcd. Mass 562.9817 (M+H).

Provenance & Evidence