Benzoic Acid → N-Benzoyl-L-tyrosine ethyl ester

Participants

Reaction Steps

L-Tyrosine ethyl ester (0.28 g, 1.35 mmol) was dissolved in DMF (9 mL). Benzoic acid (1 eq, 1.35 mmol, 0.17 g) was added, followed by N-methylmorpholine (3 eq, 4.06 mmol, 0.45 mL), 1-hydroxybenzotriazole hydrate (1.2 eq, 1.62 mmol, 0.22 g), and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (1.2 eq, 1.62 mmol, 0.31 g). The yellow solution was allowed to stir at room temperature under nitrogen for three days. The DMF was then removed by rotary evaporation and the resulting residue partitioned between ethyl acetate and water. The organic portion was separated and washed 3×H2O and 1×aq. saturated NaHCO3. It was dried over MgSO4, filtered, and concentrated to an oil. Trituration with diethyl ether induced formation of a white powder (0.32 g, 76%). MS (ES+) m/e 314 [M+H]+, 627.

Provenance & Evidence