Sodium Bicarbonate → HCID 131723835, compound

Participants

Reaction Steps

The ligand N,N-bis[(2-quinolyl)methyl]-(S)-methly-L-cysteine was prepared from the dropwise addition of (S)-methyl-L-cysteine methylester hydrochloride (2.0 g, 10.8 mmol) in 10 mL DMF to a stirring solution of 2-bromomethylquinoline (4.8 g, 21.6 mmol) and sodium bicarbonate (4.1 g, 49 mmol) in 40 mL. The mixture was allowed to react for 4 h at 80° C. Evaporation of the solvent followed by column chromatography with 3:1 hexancs: ethyl acetate (Rf 0.3) afforded the ester of the ligand (1.7 g, 82%). Saponification was achieved by stirring the ester (1.9 g, 4.4 mmol) in 8 mL THF with LiOH(4.6 mL, 1 M) for 2.5 h. The solution was then extracted with methylene chloride, and the aqueous layer acidified with 0.5 M HClO4 to pH 6. Several extractions with methylene chloride followed by drying and evaporation of the solvent afforded the crude acid. Purification by column chromatography with ethyl acetate afforded the pure ligand (0.57 g, 31%).

Provenance & Evidence