L-Methionine → N-Carbomethoxy-L-methionine

Participants

Reaction Steps

To a solution of (S)-2-amino-4-(methylthio)butanoic acid (1.0 g, 6.7 mmol) in dioxane at 0° C. was added NaOH (11.06 g, 22.12 mmol) followed by dropwise addition of methyl chloroformate (1.04 mL, 13.4 mmol) and the solution was warmed to room temperature with stirring over 2 h. The solution was diluted with EtOAc, washed with 1 N HCl, brine, dried (Na2SO4), filtered and solvent removed in vacuo to give the title compound (1.3 g, 6.27 mmol, 94%). 1H NMR (400 MHz, CDCl3) δ ppm 1.95-2.07 (m, 1H) 2.07-2.13 (m, 3H) 2.14-2.28 (m, 1H) 2.59 (t, J=7.4 Hz, 2H) 3.71 (s, 3H) 4.52 (br s, 1H) 5.33 (br s, 1H).

Provenance & Evidence