Water → N-[(1,1-Dimethylethoxy)carbonyl]-3-[(2-nitrophenyl)amino]-L-alanine

Participants

Reaction Conditions

Reaction Steps

To a solution of (S)-3-amino-2-tert-butoxycarbonylamino-propionic acid (Aldrich) (5 g, 24.48 mmol) in DMF (75 mL) was added 1-fluoro-2-nitro-benzene (2.92 mL, 26.93 mmol) and sodium bicarbonate (6.17 g, 73.44 mmol) at RT and the resulting mixture was heated at 80° C. for 18 h under nitrogen atmosphere. Water was added and the aqueous layer was washed with ethyl acetate. The pH of the aqueous solution was adjusted to 3 with the addition of 10% aqueous sodium bisulfate solution and extracted with ethyl acetate. The combined organic extracts were washed with brine, dried (Na2SO4) and concentrated under reduced pressure to give crude mass which was triturated with hexanes to afford (S)-2-tert-butoxycarbonylamino-3-(2-nitro-phenylamino)-propionic acid (5 g, 63%) as an orange yellow solid. LC-MS: 326.2 (M+H).

Provenance & Evidence