L-Lysine → L-Lysinamide

Participants

Reaction Steps

L-Lysine, N-ε-(carbobenzoxy)-[N-ε-[N-[4-[4-(2-methyl-1H-imidazol-1-yl)-butyl]phenyl]acetyl]-L-(O-benzyl)-seryl]-, (150.0 mg, 0.21 mmol), 1-hydroxy-benzotriazole hydrate (31.1 mg, 0.21 mmol), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (40.1 mg, 0.21 mmol) were mixed in dimethylformamide (2.0 mL) at 0° C. for 15 minutes. N-Methylmorpholine (60.0 mg, 0.60 mmol) and methyl (R,S)-3-amino-3-cyclohexylpropionate (46 mg, 0.21 mmol) were added, and the solution was stirred at room temperature for 16 hours. The solvent was removed at reduced pressure, and the residue taken up in methanol (1.00 mL). The product was isolated as a waxy solid by preparative HPLC to give 136 mg (73%) of L-lysinamide, N-[1-cyclohexyl-2-carbomethoxyethyl]-N-ε-(carbobenzoxy)-[N-ε-[N-[4-[4-(2-methyl-1H-imidazol-1-yl)-butyl]phenyl]-acetyl]-L-(O-benzyl)-seryl]-, ±. HRMS calcd for C50H67N6O8 (M+H) 879.5020, found 879.5030.

Provenance & Evidence